W100 CT-BL Series Cooling Tower and Boiler Controller Manual

Five Boynton Road Hopping Brook Park Holliston, MA 01746 USA
TEL: 508-429-1110 WEB: www.walchem.com
WCT/WBLW100 Series
Cooling Tower and Boiler Controller
Instruction Manual

Notice
© 2022 WALCHEM, Iwaki America Incorporated (hereinafter “Walchem”)
5 Boynton Road, Holliston, MA 01746 USA
(508) 429-1110
All Rights Reserved
Printed in USA
Proprietary Material
The information and descriptions contained herein are the property of WALCHEM. Such information and descriptions
may not be copied or reproduced by any means, or disseminated or distributed without the express prior written permis-
sion of WALCHEM, 5 Boynton Road, Holliston, MA 01746.
This document is for information purposes only and is subject to change without notice.
Statement of Limited Warranty
WALCHEM warrants equipment of its manufacture, and bearing its identification to be free from defects in workmanship
and material for a period of 24 months for electronics and 12 months for mechanical parts and electrodes from date of
delivery from the factory or authorized distributor under normal use and service and otherwise when such equipment is
used in accordance with instructions furnished by WALCHEM and for the purposes disclosed in writing at the time of pur-
chase, if any. WALCHEM’s liability under this warranty shall be limited to replacement or repair, F.O.B. Holliston, MA
U.S.A. of any defective equipment or part which, having been returned to WALCHEM, transportation charges prepaid,
has been inspected and determined by WALCHEM to be defective. Replaceable elastomeric parts and glass components
are expendable and are not covered by any warranty.
THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY, EITHER EXPRESS OR IMPLIED, AS TO DESCRIP-
TION, QUALITY, MERCHANTABILITY, FITNESS FOR ANY PARTICULAR PURPOSE OR USE, OR ANY OTHER
MATTER.
180530 Rev. V September 2022

Contents
1.0 INTRODUCTION��1
2.0 SPECIFICATIONS��2
2.1 Measurement Performance�� 2
2.2 Electrical: Input/Output�� 3
2.3 Intended Use�� 4
2.4 Mechanical�� 4
2.5 Variables and their Limits�� 5
3.0 UNPACKING INSTALLATION��7
3.1 Unpacking the unit�� 7
3.2 Mounting the electronic enclosure�� 7
3.3 Installation�� 7
3.4 Icon Definitions�� 10
3.5 Electrical installation�� 10
4.0 FUNCTION OVERVIEW��23
4.1 Front Panel�� 23
4.2 Display�� 23
4.3 Keypad�� 23
4.4 Icons�� 23
4.5 Startup�� 25
4.6 Shut Down�� 30
5.0 OPERATION��31
5.1 Alarms Menu �� 31
5.2 Inputs Menu �� 31
5.2.1 Contacting Conductivity�� 33
5.2.2 Electrodeless Conductivity�� 33
5.2.3 Temperature�� 34
5.2.4 DI State�� 34
5.2.5 Flow Meter, Contactor Type�� 35
5.2.6 Flow Meter, Paddlewheel Type�� 35
5.3 Outputs Menu �� 36
5.3.1 Relay, Any Control Mode�� 36
5.3.2 Relay, On/Off Control Mode�� 36
5.3.3 Relay, Flow Timer Control Mode�� 37
5.3.4 Relay, Bleed and Feed Control Mode�� 37
5.3.5 Relay, Bleed then Feed Control Mode�� 37
5.3.6 Relay, Percent Timer Control Mode�� 38
5.3.7 Relay, Biocide Timer Control Mode�� 38

5.3.8 Relay, Alarm Mode��39
5.3.9 Relay, Time Proportional Control Mode��40
5.3.10 Relay, Intermittent Sampling Control Mode��40
5.3.11 Relay or Analog Output, Manual Mode��41
5.3.12 Relay, Pulse Proportional Control Mode��41
5.3.13 Relay, Dual Set Point Mode��41
5.3.14 Relay, Probe Wash Control Mode��42
5.3.15 Analog Output, Retransmit Mode��43
5.3.16 Analog Output, Proportional Control Mode��43
5.3.17 Analog Output, Flow Proportional Mode��44
5.4 Settings Menu ��45
5.4.1 Global Settings��45
5.4.2 Security Settings��45
5.4.3 Display Settings��45
5.4.4 File Utilities��45
5.4.5 Controller Details��46
6.0 MAINTENANCE�� 47
6.1 Conductivity Sensor Cleaning��47
7.0 TROUBLESHOOTING�� 48
7.1 Calibration Failure��48
7.1.1 Contacting Conductivity Sensors��48
7.1.2 Electrodeless Conductivity Sensors��48
7.2 Alarm Messages��49
8.0 SERVICE POLICY�� 52
9.0 SPARE PARTS IDENTIFICATION�� 53

1
1.0 INTRODUCTION
The Walchem WCT/WBL100 Series controllers offer a high level of flexibility in controlling cooling tower and boiler
water treatment applications.
One sensor input is available that are compatible with a variety of sensors:
Cooling tower, boiler, and low cell constant condensate contacting conductivity
Electrodeless conductivity
Two digital inputs may be used for a variety of purposes:
State type: Flow switch or other Interlock to stop control, or drum level switch
Water meter contactor: To control a relay to feed a chemical based on flow total
Paddlewheel flowmeter: To control based on flow total or flow rate
Three relay outputs may be set to a variety of control modes:
On/Off set point control
Bleed or Feed based on a Water Contactor or Paddlewheel flow meter input
Feed and Bleed
Feed and Bleed with Lockout
Feed as a percent of Bleed
Feed as a percentage of elapsed time
Daily, Weekly, 2-week or 4-week Biocide timers with pre-bleed and post-add lockout of bleed
Intermittent sampling for boilers with proportional blowdown, controlling on a trapped sample
Time Proportional control
Always on unless interlocked
Dual set point
Probe Wash timer
Diagnostic Alarm triggered by:
High or Low sensor reading
No Flow
Relay output timeout
Sensor error
An optional isolated analog output may be included to retransmit sensor input signals to a chart recorder, data logger,
PLC or other device.
Our unique USB features provide the ability to upgrade the software in the controller to the latest version.

2
2.0 SPECIFICATIONS
2.1 Measurement Performance
0.01 Cell Contacting Conductivity
Range 0-300 µS/cm
Resolution 0.01 µS/cm, 0.0001 mS/cm, 0.001 mS/m, 0.0001 S/m, 0.01 ppm
Accuracy ± 1% of reading or 0.01 µS/cm, whichever is greater
Range 0-3,000 µS/cm
Resolution 0.1 µS/cm, 0.0001 mS/cm, 0.01 mS/m, 0.0001 S/m, 0.1 ppm
Accuracy ± 1% of Reading or 0.1 µS/cm, whichever is greater
Range 0-30,000 µS/cm
Resolution 1 µS/cm, 0.001 mS/cm, 0.1 mS/m, 0.0001 S/m, 1 ppm
Accuracy ± 1% of Reading or 1 µS/cm, whichever is greater

Range 1,000-300,000 µS/cm
Resolution 10 µS/cm, 0.01 mS/cm, 1 mS/m, 0.001 S/m, 10 ppm
Accuracy ± 1% of Reading or 10 µS/cm, whichever is greater
100Ω RTD Temperature
Range 23 to 500°F (-5 to 260°C)
Resolution 0.1°F (0.1°C)
Accuracy ± 1% of Reading or ± 1°C, whichever is greater
1000Ω RTD Temperature
Range 23 to 500°F (-5 to 260°C)
Accuracy ± 1% of Reading or ± 0.3°C, whichever is greater
10k or 100k ThermistorTemperature
Range 23 to 194°F (-5 to 90°C)
Accuracy ± 1% of Reading or ± 0.3°C, whichever is greater
Electrodeless Conductivity
Ranges Resolution Accuracy
500-12,000 µS/cm 1 µS/cm, 0.01 mS/cm, 0.1 mS/m, 0.001 S/m, 1 ppm ± 1% of reading
3,000-40,000 µS/cm 1 µS/cm, 0.01 mS/cm, 0.1 mS/m, 0.001 S/m, 1 ppm ± 1% of reading
10,000-150,000 µS/cm 10 µS/cm, 0.1 mS/cm, 1 mS/m, 0.01 S/m, 10 ppm ± 1% of reading
50,000-500,000 µS/cm 10 µS/cm, 0.1 mS/cm, 1 mS/m, 0.01 S/m, 10 ppm ± 1% of reading
200,000-2,000,000 µS/cm 100 µS/cm, 0.1 mS/cm, 1 mS/m, 0.1 S/m, 100 ppm ± 1% of reading

3
Temperature °C Range Multiplier Temperature °C Range Multiplier
0 181.3 80 43.5
10 139.9 90 39.2
15 124.2 100 35.7
20 111.1 110 32.8
25 100.0 120 30.4
30 90.6 130 28.5
35 82.5 140 26.9
40 75.5 150 25.5
50 64.3 160 24.4
60 55.6 170 23.6
70 48.9 180 22.9
Note: Conductivity ranges above apply at 25°C. At higher temperatures, the range is reduced per the range multiplier chart.
2.2 Electrical: Input/Output
Input Power 100 to 240 VAC +/- 10%, 50 or 60 Hz, 7 A maximum
Fuse: 6.3 A
Input Signals
Contacting Conductivity 0.1, 1.0, or 10.0 cell constant OR
Electrodeless Conductivity
Temperature 100 or 1000 ohm RTD, 10K or 100K Thermistor
Digital Input Signals (2):
State-Type Digital Inputs Electrical: Optically isolated and providing an electrically isolated 9V power with a
nominal 2.3mA current when the digital input switch is closed
Typical response time: 2 seconds
Devices supported: Any isolated dry contact (i.e. relay, reed switch)
Types: Interlock
Low Speed Counter-Type
Digial Inputs
Electrical: Optically isolated and providing an electrically isolated 9V power with
a nominal 2.3mA current when the digital input switch is closed 0-10 Hz, 50 msec
minimum width
Devices supported: Any device with isolated open drain, open collector, transistor or
reed switch
Types: Contacting Flowmeter
High Speed Counter-Type
Digial Inputs
Electrical: Optically isolated and providing an electrically isolated 9V power with a
nominal 2.3mA current when the digital input switch is closed, 0-500 Hz,
1.00 msec minimum width
Minimum pulse frequency for the rate to be displayed: 0.17 Hz
Devices supported: Any device with isolated open drain, open collector, transistor or
reed switch
Types: Paddlewheel Flowmeter
Powered Mechanical Relays
(0 or 3 depending on model
code):
Pre-powered on circuit board switching line voltage
6 A (resistive), 1/8 HP (93 W) per relay
All three relays are fused together as one group, total current for this group must not
exceed 6A

4
Dry contact Mechanical
Relays (0 or 3 depending on
model code):
6 A (resistive), 1/8 HP (93 W) per relay
Dry contact relays are not fuse protected
4 - 20 mA (0 or 1 depending
on model code):
Internally powered
Fully isolated
600 Ohm max resistive load
Resolution 0.0015% of span
Accuracy ± 0.5% of reading
Agency Approvals
Safety UL 61010-1:2012 3rd Ed + Rev:2016
CSA C22.2 No. 61010-1:2012 3rd Ed. + U1; U2
IEC 61010-1:2010 3rd Ed.
EN 61010-1:2010 3rd Ed.
BS EN 61010-1:2010 + A1:2019
EMC IEC 61326-1:2012
EN 61326-1:2013
BS EN 61326-1:2013
Note: For EN61000-4-6, EN61000-4-3 the controller met performance criteria B.
*Class A equipment: Equipment suitable for use in establishments other than domestic, and those directly connected to
a low voltage (100-240 VAC) power supply network which supplies buildings used for domestic purposes.
2.3 Intended Use
The Walchem W100 Series is a microprocessor-based measuring and control instrument used to measure water
quality parameters and other process variables in a wide range of water and wastewater treatment applications.
Operating the instrument in any way other than as described in these instructions may compromise the safety
and function of the measuring system and is therefore impermissible. Electrical connection work and mainte-
nance work may only be carried out by qualified personnel. The manufacturer is not liable for damage caused
by improper or non-designated use.
2.4 Mechanical
Enclosure Material Polycarbonate
Enclosure Rating Certified to UL 50 and UL 50E Type 4X. IEC 60529 meets IP66.
Environmental Conditions Can be installed indoors and outdoors. Suitable for wet location.
Dimensions 8” x 8” x 3” (203 mm x 203 mm x 76 mm)
Display 128 x 64 graphic backlit display
Operating Ambient Temp -4 to 131 °F (-20 to 55 °C)
Storage Temperature -4 – 176°F (-20 – 80°C)
Humidity 10 to 90% non-condensing
Pollution Degree 2
Overvoltage Category II
Altitude 2000 m (6560 ft) maximum
Mechanical (Sensors) (*See graph)
Sensor Pressure Temperature Materials
Process
Connections
Graphite contacting
conductivity tower
0-150 psi up to 100°F (38°C)*
0- 50 psi at 140°F (60°C)
32-140°F *
(0-60°C)
GFRPP, Graphite, FKM 3/4” NPTF

5
316 SS contacting
conductivity tower
0-150 psi up to 100°F (38°C) *
0- 50 psi at 140°F (60°C)
32-140°F *
(0-60°C)
GFRPP, 316SS, FKM 3/4” NPTF
High pressure tower 0-300 psi (0-20 bar)*
32-158°F *
(0-70°C)
316SS, PEEK 3/4” NPTF
Electrodeless tower
0-150 psi up to 100°F (38°C)*
0- 50 psi at 140°F (60°C)
32-140°F *
(0-60°C)
PP, PVC, FKM 3/4” NPTF
Low pressure manifold
0-150 psi up to 100°F (38°C)*
0- 50 psi at 140°F (60°C)
32-140°F *
(0-60°C)
GFRPP, PVC, FKM,
Isoplast
3/4” NPTF
High pressure manifold 0-300 psi (0-20 bar)*
32-158°F *
(0-70°C)
Carbon steel, steel, brass 3/4” NPTF
Boiler/condensate
contacting conductivity
0-250 psi (0-17 bar)
32-401°F
(0-205°C)
316SS, PEEK 3/4” NPTM
pH/ORP
LD2
Cond
HP Cond/Steel
0
50
100
150
200
250
300
350
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
°F
Pressure vs. Temperature
PSI
-1.1
4.4
10.0
15.5
21.1
26.6
32.2
37.7
43.3
48.8
54.4
60.0
65.5
71.1
76.6
82.2
°C
Bar
HP pH/ORP/Steel
24.1
20.7
17.2
13.8
10.3
6.9
3.4
2.5 Variables and their Limits

Sensor input settings Low Limit High Limit
Conductivity alarm limits 0 50,000
Conductivity alarm dead band 0 50,000
Cell constant 0.01 10
Smoothing Factor 0% 90%
Comp Factor (conductivity linear ATC only) 0% 20%
Installation Factor (Electrodeless conductivity only) 0.5 1.5
Cable length 0.1 3,000
PPM conversion factor (only if units = PPM) 0.001 10.000
Default temperature -20 500
Calibration Required Alarm 0 days 365 Days
Flow meter input settings Low Limit High Limit
Totalizer alarm 0 100,000,000

6
Volume/contact for units of Gallons or Liters 1 100,000
Volume/contact for units of m3
0.001 1,000
K Factor for units of Gallons or Liters 0.01 10,000
K Factor for units of m3
1 100,000
Paddlewheel rate alarm limits 0 High end of sensor range
Paddlewheel rate alarm deadband 0 High end of sensor range
Smoothing Factor 0% 90%
Set Flow Total 0 1,000,000,000
Relay output settings Low Limit High Limit
Output Limit Time 1 second 86,400 seconds (0 = unlimited)
Hand Time Limit 1 second 86,400 seconds (0 = unlimited)
Min Relay Cycle 0 seconds 300 seconds
Set Point Lowendofsensorrange High end of sensor range
Duty Cycle Period (On/Off, Dual Set-point modes) 0:00minutes 59:59 minutes
Duty Cycle (On/Off, Dual Setpoint modes) 0% 100%
Dead Band Lowendofsensorrange High end of sensor range
Feed duration (Flow timer mode) 0 seconds 86,400 seconds
Accumulator volume (Flow timer mode) 0 1,000,000
Feed Percentage (Bleed then Feed mode) 0% 1000%
Feed Lockout Time Limit (Bleed Feed, Bleed then Feed modes) 0 seconds 86,400 seconds
Prebleed to Conductivity (Biocide mode) 1 (0 = no prebleed) High end of sensor range
Prebleed Time (Biocide mode) 0 seconds 86,400 seconds
Bleed Lockout(Biocide mode) 0 seconds 86,400 seconds
Event duration (Biocide, Timer modes) 0 seconds 86,400 seconds
Proportional band (Time/Pulse Proportional mode, Intermittent
Sampling)
Low end of sensor
range
High end of sensor range
Sample period (Time Proportional mode) 10 seconds 3600 seconds
Sample Time (Intermittent Sampling mode) 0 seconds 3600 seconds
Hold Time (Intermittent Sampling mode) 0 seconds 3600 seconds
Maximum Blowdown (Intermittent Sampling mode) 0 seconds 3600 seconds
Wait Time (Intermittent Sampling mode) 0 seconds 86,400 seconds
Max Rate (Pulse Proportional mode) 10 pulses/minute 2400 pulses/minute
Minimum Output (Pulse Proportional mode) 0% 100%
Maximum Output (Pulse Proportional mode) 0% 100%
On Delay Time (Alarm mode) 0 seconds 23:59:59 HH:MM:SS
Off Delay Time (Alarm mode) 0 seconds 23:59:59 HH:MM:SS
Analog (4-20 mA) Output settings Low Limit High Limit
4 mA Value 0 30,000
20 mA Value 0 30,000
Hand Output 0% 100%
Set Point 0 30,000
Proportional Band 0 30,000
Minimum Output 0% 100%
Maximum Output 0% 100%
Off Mode Output (Proportional, PID, Flow Prop modes) 0 mA 21 mA
Pump Capacity (Flow Prop mode) 0 gal/hour or l/hour 10,000 gal/hour or l/hour
Pump Setting (Flow Prop mode) 0% 100%

7
Specific Gravity (Flow Prop mode) 0 g/ml 9.999 g/ml
Target (Flow Prop mode) 0 ppm 1,000,000 pm
Error Output 0 mA 21 mA
Configuration settings Low Limit High Limit
Local Password 0000 9999
Alarm Delay 0:00 minutes 59:59 minutes

3.0 UNPACKING INSTALLATION
3.1 Unpacking the unit
Inspect the contents of the carton. Please notify the carrier immediately if there are any signs of damage to the
controller or its parts. Contact your distributor if any of the parts are missing. The carton should contain a W100
series controller and an instruction manual. Any options or accessories will be incorporated as ordered.
3.2 Mounting the electronic enclosure
The controller is supplied with mounting holes on the enclosure. It should be wall mounted with the display at eye level,
on a vibration-free surface, utilizing all four mounting holes for maximum stability. Do not install the enclosure in a
location where it will be exposed to direct sunlight. Use M6 (1/4” diameter) fasteners that are appropriate for the sub-
strate material of the wall. The enclosure is NEMA 4X (IP65) rated. The maximum operating ambient temperature
is 131°F (55°C); this should be considered if installation is in a high temperature location. The enclosure requires
the following clearances:
Top: 2” (50 mm)
Left: 8” (203 mm) (not applicable for prewired models)
Right: 4” (102 mm)
Bottom: 7” (178 mm)
3.3 Installation
Once the controller is mounted, the metering pumps may be located at any distance from the controller.
Plumbing
The W100 series controllers can be supplied with a flow switch manifold designed to provide a continuously flowing
sample of cooling water to the sensors. Please refer to Figures 2 through 6 below for some typical installation drawings.
Cooling Towers:
Tap off the discharge side of the recirculation pump to provide a minimum flow of 1 gallon per minute past the sensor.
The sample must flow into the bottom of the manifold in order to close the flow switch, and return to a point of
lower pressure in order to ensure flow. Install an isolation valve on both sides of the manifold to stop flow for
sensor maintenance.
The contacting conductivity sensor should be placed as close to the controller as possible, to a maximum distance of
250 ft. (76 m). Less than 25 ft. (8 m) is recommended. The cable must be shielded from background electrical noise.
Always route low voltage (sensor) signals with at least a 6” (15 cm) separation from AC voltage wiring.
The electrodeless conductivity sensor should be placed as close to the controller as possible, to a maximum distance
of 120 ft. (37 m). Less than 20 ft. (6 m) is recommended.. The cable must be shielded from background electrical noise.
Always route low voltage (sensor) signals with at least a 6” (15 cm) separation from AC voltage wiring. These sensors
are affected by the geometry and conductivity of their surroundings, so either maintain 6 inches (15 cm) of sample
around the sensor or ensure that any nearby conductive or nonconductive items are consistently positioned. Do not install
the sensor in the path of any electrical current that may be flowing in the solution, as this will shift the conductivity reading.

8
IMPORTANT: To avoid damaging the female pipe threads on the supplied plumbing parts, use no more than 3 wraps
of PTFE tape and thread into the pipe FINGER tight only! DO NOT use any pipe dope, plumber’s putty or other
sealing products that containdiacetone alcohol, as these attack the flow switch plastic! Use PTFE tape ONLY!
Boilers:
The conductivity sensor should be placed as close to the controller as possible, to a maximum distance of 250 ft.
(76m). The cable MUST be shielded from background electrical noise. Use 24 AWG cable.
Important Boiler Installation Notes: (see figures 3 and 4)
1. Make sure the minimum water level in the boiler is at least 4-6 inches (10-15 cm) above the skimmer blowdown
line. If the skimmer line is closer to the surface, it is likely that steam will be drawn into the line instead of boiler
water. The skimmer line must also be installed above the highest tube.
2. Maintain a 3/4 inch minimum pipe ID with no flow restrictions from the tap for the boiler skimmer blowdown
line to the electrode. If the ID is reduced below 3/4 inch, then flashing will occur beyond that point and the con-
ductivity reading will be low and erratic. Minimize the usage of tees, valves, elbows or unions between the boiler
and the electrode.
3. A manual shut off valve should be installed so that the electrode can be removed and cleaned. This valve must be
a full port valve in order to avoid a flow restriction.
4. Keep the distance between the tap for the boiler skimmer line to the electrode as short as possible, to a maximum
of 10 feet (3m).
5. Mount the electrode in the side branch of a tee in a horizontal run of pipe. This will minimize entrapment of
steam around the electrode and will allow any solids to pass through.
6. There MUST be a flow restriction after the electrode and/or control valve in order to provide back pressure. This
flow restriction will be either a flow control valve or an orifice union. The amount of the flow restriction will
affect the blowdown rate as well, and should be sized accordingly.
7. Install the motorized ball valve or solenoid valve per the manufacturer’s instructions.
For best results, align the hole in the conductivity electrode such that the direction of water flow is through the hole.
Guide to Sizing Blowdown Valves and Orifice Plates
1. Determine the Rate of Steam Production in Pounds per Hour:
Either read off the boiler name plate (water-tube boilers) or Calculate from horsepower rating (fire-tube boilers):
HP x 34.5 = lbs./hr. Example: 100 HP = 3450 lbs./hr
2. Determine the Concentration Ratio (BASED ON FEEDWATER)
A water treatment chemical specialist should determine the desired number of cycles of concentration. This is the
ratio of TDS in the boiler water to TDS in the feedwater. Note that feedwater means the water that is fed to the
boiler from the deaerator and includes makeup water plus condensate return.
Example: 10 cycles of concentration has been recommended
3. Determine the Required Blowdown Rate in Pounds Per Hour
Blowdown Rate = Steam Production / (Concentration Ratio –1)
Example: 3450/(10-1) = 383.33 lbs./hr.
4. Determine if Continuous or Intermittent Sampling is Required
Use intermittent sampling when the boiler operation or loading is intermittent, or on boilers where the required
blowdown rate is less than 25% of the smallest available flow control valve or less than the flow through the
smallest orifice. See the graphs on the next page.
Use continuous sampling when the boiler is operating 24 hours per day and the required blowdown rate is more
than 25% of the smallest applicable flow control valve or orifice. See the graphs on the next page.

9
Use of a flow control valve will give you the best control of the process, since the flow rate can be easily
adjusted. The dial on the valve also gives you a visual indication if the flow rate has been changed. If the valve
clogs, it can be opened to clear the obstruction, and closed to the previous position.
If an orifice plate is used, you must install a valve downstream from the orifice in order to fine tune the flow
rate and provide additional back pressure in many applications.
Example: An 80 psi boiler has a Required Blowdown Rate of 383.33 lbs./hr. The maximum flow rate of the
smallest flow control valve is 3250 lbs./hr. 3250 x 0.25= 812.5 which is too high for continuous sampling.
Using an orifice, the flow rate through the smallest diameter plate is 1275 lbs./hr. This is too high for continuous
sampling.
5. Determine the Orifice or Flow Control Valve Size for this Blowdown Rate
Use the following graphs to select a flow control device:
lbs/hr
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
10 20 30 40 50 60 70 80 90 100 200 300
Pressure PSI
Flow Rate in Lbs/hr for Various Orifices
1/8 inch dia
3/16 inch dia
1/4 inch dia
5/16 inch dia

10
0
5000
10000
15000
20000
25000
20 30 40 50 60 70 80 90 100 150 200 300
Pressure PSI
Flow Control Valve
Maximum Flow Rates in Lbs/hr
1/2 150 PSI
1/2 300 PSI
3/4 150 PSI
3/4 300 PSI
lbs/hr
3.4 Icon Definitions
Symbol Publication Description
IEC 417, No.5019 Protective Conductor Terminal
IEC 417, No. 5007 On (Supply)
O IEC 417, No. 5008 Off (Supply)
ISO 3864, No. B.3.6 Caution, risk of electric shock
ISO 3864, No. B.3.1 Caution
3.5 Electrical installation
The various standard wiring options are shown in figure 1 below. Your controller will arrive from the factory prewired
or ready for hardwiring. Depending on your configuration of controller options, you may be required to hardwire some
or all of the input/output devices. Refer to figures 7 through 13 for circuit board layout and wiring.

11
Note: when wiring the optional flow meter contactor input, the 4-20 mA outputs or a remote flow switch, it is advisable
to use stranded, twisted, shielded pair wire between 22-26 AWG. Shield should be terminated at the controller (see
figure 10).
CAUTION
1. There are live circuits inside the controller even when the power switch on the front panel is in the OFF position!
The front panel must never be opened before power to the controller is REMOVED!
If your controller is prewired, it is supplied with a 8 foot, 18 AWG power cord with USA style plug. A tool (#1
Phillips driver) is required to open the front panel.
2. When mounting the controller, make sure there is clear access to the disconnecting device!
3. The electrical installation of the controller must be done by trained personnel only and conform to all applicable
National, State and Local codes!
4. Proper grounding of this product is required. Any attempt to bypass the grounding will compromise the safety of
persons and property.
5. Operating this product in a manner not specified by Walchem may impair the protection provided by the equipment.
AC Power
Power
Switch
Relay
Outputs
Digital Inputs
Analog Output
Optional pH/ORP/ISE
Sensor BNC
Sensor
Figure 1 Conduit Wiring

12
HEAT
EXCHANGER
COOLING TOWER
�METERING
PUMPS
13
11.75
Figure 2 Typical Cooling Tower Installation

13
Install accessories
either vertically or
horizontally, per
manufacturer's
instructions.
To Drain
Skimmer Blowdown Line
3/4 Min. up to Electrode
Full Port Block
Valve
Manual Blowdown
(Normally Closed)
Motorized
Ball
or Solenoid
Valve
Flow
Control
Valve or
Orifice Union
CONDUCTIVITY
ELECTRODE
¾ TEE
2 ft.
minimum
1 to 3 ft.
maximum
10 ft. max.
with minimal valves, elbows unions
TO
DRAIN
1
2
3
Figure 3 Typical Boiler Installation Intermittent Sampling

14
Install accessories
either vertically or
horizontally, per
manufacturer's
instructions.
To Drain
Skimmer Blowdown Line
3/4 Min. up to Electrode
Full Port Block
Valve
Manual Blowdown
(Normally Closed)
Motorized
Ball
or
Solenoid
Valve
Flow
Control
Valve
or Orifice
Union
CONDUCTIVITY
ELECTRODE
¾ TEE
Flow
Control
Valve or
Orifice Union
To Drain
To Drain
1
2
3
Figure 4 Typical Boiler Installation Continuous Sampling

15
TO
110 VOLT AC
OUTLET
TO
SANITARY
SEWER
COOLING
TOWER
OPEN
SUMP
CIRCULATION
PUMP
(X) Unions; installed for replacement of
solenoid or strainer
(Y) ½ Y-strainer
(Z) ½solenoid
TYPICAL INSTALLATION
SUBMERSION ELECTRODE
(OPTION A)
VALVE
X
Y
Z
X
VALVE
X Y Z X
(OPTION B)
TO
SANITARY
SEWER
PROBE
NOTE: LOCATION OF SOLENOID VALVE
USING OPTION A OR OPTION B
DEPENDS ON SYSTEM CONFIGURATION.
DETAIL OF
PROBE ASSEMBLY
CLIP PROBE
ASSEMBLY TO
SUMP WALL FOR
EASY REMOVAL
FOR CLEANING
TO
CONTROLLER
1 PVC PIPE
1 NPTF PVC
COUPLING
¾ PROBE
IN TEE
INSTALL APPROXIMATELY
HALF-WAY IN SUMP VOLUME
AVOID INSTALLATION NEAR
PUMP SUCTION INLET
CHEMICAL
PUMP
CHEMICAL
TANK
1
2
3
Figure 5 Typical Cooling Tower Installation Submersion Sensor

16
TO ELECTRODE
TO SOLENOID
TO
CONSTANT
110 VOLTS
PE DISCHARGE
TUBING
CHEMICAL
PUMP TO
SANITARY
SEWER
SPRAY TOWER
SPRAY
PUMP
CITY WATER
MAKEUP
SHUTOFF
VALVE
(A)
(D)
(A)
(B) (F)
(C)
(E)
(A) Unions; installed for replacement of
solenoid, strainer or probe
(B) ½ solenoid
(C) ½ Y-strainer
(D) Conductivity sensor in ¾ NPTF tee
(supplied with controller)
(E) ½ PVC bulkhead fitting
(F) winter drain
TYPICAL INSTALLATION
INTERMITTENT SAMPLING
CHEMICAL
TANK
1
2
3
Figure 6 Typical Cooling Tower Installation Intermittent Sampling

17
1
2
3
4
5
6
7
8
9
10
11
12
TB2
TB1
FUSE
POWER
SWITCH
POWER
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
R1
R2
R3
N
N
N
N
L
DIGITAL
INPUT

OPTIONAL
ANALOG
OUTPUT
TERMINAL
BLOCK
POWER
SUPPLY
EARTH
GROUND
TERMINAL
BLOCK
RELAY
OUTPUT
TERMINAL
BLOCK
FUSE
AC
POWER
TERMINAL
BLOCK
SENSOR
INPUT
TERMINAL
BLOCK
OPTIONAL
NON-AMPLIFIED
PH/ORP
INPUT
TERMINAL
BLOCK
MAIN
CONTROLLER
BOARD
RIBBON
CABLE
TB3
TB4
TB5
TB6
TB7
+
pH
–
USB
CONNECTOR
Figure 7 Identification of Parts

18
1
2
3
4
5
6
7
8
9
10
11
12
TB2
TB1
FUSE
POWER
SWITCH
POWER
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
R1
R2
R3
N
N
N
N
L
TB3
TB4
TB5
TB6
TB7
+
pH
–
TB1 ECOND CCOND
pH/ORP
w/BNC
pH/ORP
DIS
1 XMT+ XMT
USE
FOR
INPUT
SIGNAL
2 XMT–
3 X-SHLD
4 +5V
5 RCV–
6 RCV+
7 RCV IN+
8 –5V
9 TEMP– TEMP– TEMP– TEMP–
10 TEMP+ TEMP+ TEMP+ TEMP+
11 IN–
12
SHIELD SHIELD SHIELD
TB2 FUNCTION
1 4-20 OUT–
2 4-20 OUT+
3 SHIELD
4 DIG IN 2–
5 DIG IN 2+
6 +9 VDC
7 SHIELD
8 DIG IN 1–
9 DIG IN 1+
10 +9 VDC
11 SHIELD
12
BNC
TB1
1
2
3
4
5
6
7
8
9
10
11
12
Conductivity
Electrode
TEMP– WHT
TEMP+ GRN
RCV BLK
SHIELD
XMT RED
SAFETY COVER LABEL
R-SHLD
High Pressure
Conductivity
Electrode
GRN WHT RED BLK
Condensate
Electrode
(wiring is typical of all three sensor options)
Figure 8 Contacting Conductivity Sensor Input Wiring

19
1
2
3
4
5
6
7
8
9
10
11
12
TB2
TB1
FUSE
POWER
SWITCH
POWER
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
R1
R2
R3
N
N
N
N
L
TB3
TB4
TB5
TB6
TB7
+
pH
–
TB1 ECOND CCOND
pH/ORP
w/BNC
pH/ORP
DIS
1 XMT+ XMT
USE
FOR
INPUT
SIGNAL
2 XMT–
3 X-SHLD
4 +5V
5 RCV–
6 RCV+
7 RCV IN+
8 –5V
11 IN–
12
TB2 FUNCTION
1 4-20 OUT–
2 4-20 OUT+
3 SHIELD
4 DIG IN 2–
5 DIG IN 2+
6 +9 VDC
7 SHIELD
8 DIG IN 1–
9 DIG IN 1+
10 +9 VDC
11 SHIELD
12
BNC
TB1
1
2
3
4
5
6
7
8
9
10
11
12
TEMP + GRN
TEMP - BLK
RCV – BLK
X-SHLD
XMT + WHT
SAFETY COVER LABEL
XMT – BLK
RCV + RED
R-SHLD
R-SHLD
Figure 9 Electrodeless Conductivity Sensor Input Wiring

20
1
2
3
4
5
6
7
8
9
10
11
12
TB2
TB1
FUSE
POWER
SWITCH
POWER
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
R1
R2
R3
N
N
N
N
L
TB3
TB4
TB5
TB6
TB7
+
pH
–
TB1 ECOND CCOND
pH/ORP
w/BNC
pH/ORP
DIS
1 XMT+ XMT
USE
FOR
INPUT
SIGNAL
2 XMT–
3 X-SHLD
4 +5V
5 RCV–
6 RCV+
7 RCV IN+
8 –5V
11 IN–
12
TB2 FUNCTION
1 4-20 OUT–
2 4-20 OUT+
3 SHIELD
4 DIG IN 2–
5 DIG IN 2+
6 +9 VDC
7 SHIELD
8 DIG IN 1–
9 DIG IN 1+
10 +9 VDC
11 SHIELD
12
BNC
TB2
1
2
3
4
5
6
7
8
9
10
11
12
Reed Switch, Relay
(Flow Switch, Water Meter)
Polarity not critical
Hall Effect
Flow Meter
SHIELD
INPUT –
POWER
Chart
Recorder
+
–
SIGNAL +
SHIELD
SHIELD
R-SHLD
Figure 10 Digital Input and Analog Output Wiring

21
1
2
3
4
5
6
7
8
9
10
11
12
TB2
TB1
FUSE
POWER
SWITCH
POWER
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
R1
R2
R3
N
N
N
N
L
TB3
TB4
TB5
TB6
TB7
+
pH
–
R1
R2
R3
N
N
N
N
L
TB3
TB4
TB5
TB6
SOLENOID/
MOTORIZED
BALL VALVE
PUMP
ALARM
WHT 120V
BLU 240V
BLK 120V
BRN 240V
GRN 120V
GRN/YEL 240V
Power Supply
(120 VAC or 240 VAC)
GRN
120V
GRN/YEL
240V
BLK 120V
BRN 240V
WHT 120V
BLU 240V
N
L
N
N
N
NC
NO
NC
NO
NC
NO
NC
NO
NC
NO
NC
NO
GRN 120V
GRN/YEL 240V
GRN 120V
GRN/YEL 240V
BLK 120V
BRN 240V
WHT 120V
BLU 240V
BLK 120V
BRN 240V
IF MOTORIZED BALL VALVE
WHT 120V
BLU 240V
Figure 11 W100 AC Power Relay Output Wiring

22
1
2
3
4
5
6
7
8
9
10
11
12
TB2
TB1
FUSE
POWER
SWITCH
POWER
SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
R1
R2
R3
N
N
N
N
L
TB3
TB4
TB5
TB6
TB7
+
pH
–
R1
R2
R3
N
L
TB3
TB5
TB6
PUMP
ALARM
BLK 120V
BRN 240V
Power Supply
(120 VAC or 240 VAC)
GRN
120V
GRN/YEL
240V
BLK 120V
BRN 240V
WHT 120V
BLU 240V
N
L
BLK 120V
BRN 240V
WHT 120V
BLU 240V
BLK 120V
BRN 240V
Fused
External
Power
Source
PLC
GRN 120V
GRN/YEL 240V
Fused
External
Power
Source
GRN 120V
GRN/YEL 240V
WHT 120V
BLU 240V
BLK 120V
BRN 240V
Figure 12 W110 AC Power Relay Output Wiring

23
4.0 FUNCTION OVERVIEW
4.1 Front Panel
Figure 13 Front Panel
4.2 Display
A Home screen is displayed while the controller is on. This display shows the sensor readings, active alarms and a row
of icons that are used to navigate to other screens.
4.3 Keypad
The keypad consists of 5 ATM type keys and a Home key used to return to the summary screen. The icon above the
ATM keys will define its purpose on the current screen being displayed.
4.4 Icons
The following icons appear on the Home screen. Press the key below the icon to get to the main menu selections.
Alarm Menu
Inputs Menu
Outputs Menu
Configuration/Settings Menu

24
Other icons may appear in the menu screens.
Alarm Menu
Inputs Menu
Outputs Menu
Configuration/Settings Menu
Calibration key appears in sensor input menus and brings up the calibration menu
X Cancel key cancels any entry
The Page Down icon scrolls down to a new page in a list of options.
The Page Up icon scrolls up to a new page in a list of options.
The Confirm icon accepts a choice and advances to the next calibration step
The Back/Return icon returns the display to the previous screen
The Make Character Higher key is used when making an alphanumeric entry
The Make Character Lower key is used when making an alphanumeric entry
The Move Cursor key is used to scroll left to right within an alphanumeric entry
The ENTER key is used to finish entering data or enter a highlighted menu choice
Overview of the use of keys
Changing Numeric Values
To change a number, use the Move Cursor key to the digit to be changed. If the new number will be negative, start
with the sign using the Make Character Higher key. Move the cursor to each digit and change the value using either
the Make Character Higher or Lower keys. Once the value of the number is correct use the Enter key to store the new
value into memory, or use the Cancel key to leave the number at its previous value and go back.
Changing Names
To change the name used to identify an input or output, use the Move Cursor key to the character to be changed and
change it using either the Make Character Higher or Lower keys. Upper case and lower case letter, numbers, a blank
space, period, plus and minus symbols are available. Move the cursor to the right and modify each character. Once the
word is correct, use the Enter key to store the new value into memory, or use the Cancel key to leave the word at its
previous value and go back.

25
Choosing from a List
Selecting the type of sensor, the units of measure of an input, or the control mode used for an output, the selection is
picked from a list of available options. Use the Page Up or Down keys to highlight the desired option, and then use
the Enter key to store the new option into memory, or use the Return key to leave the option at its previous value and
go back.
Hand-Off-Auto Relay Mode
Use the Left or Right Move Cursor keys to highlight the desired relay mode. In Hand mode the relay is forced on for
a specified amount of time and when that time is up the relay returns to its previous mode, in Off mode the relay is
always off until taken out of Off mode, and in Auto mode the relay is responding to control set points. Use the Confirm
key to accept the option, or the Return key to leave the option at its previous value and go back.
Interlock and Force On Menus
To select which outputs to force on, or which outputs to be interlocked, use the Move Cursor key to highlight the output
to be selected, then use the Make Character Higher or Lower keys to check or uncheck that output. When finished, press
the Confirm key to accept the changes or the Cancel key to leave the selections at the previous settings and go back.
4.5 Startup
Initial Startup
After having mounted the enclosure and wired the unit, the controller is ready to be started. Plug in the controller and
turn on the power switch to supply power to the unit. The display will briefly show the model number and then revert
to the normal summary display. Press the Home key if necessary to get to the Home screen. Refer to section 5 below
for more details on each of the settings.
Settings Menu (see section 5.4)
Choose language
Press the Configuration Settings key. Press the Enter key. Press the Scroll Down key until the English word “Language”
is highlighted. Press the Enter key. Press the Scroll Down key until your language is highlighted. Press the Confirm key
to change all menus to your language.
Set date (if necessary)
Press the Scroll Up key until Date is highlighted. Press the Enter key. Press the Move Cursor key to highlight the
Day, and then use the Make Character Higher or Lower keys to change the date. Press the Confirm key to accept the
change.
Set time (if necessary)
Press the Scroll Down key until Time is highlighted. Press the Enter key. Press the Move Cursor key to highlight
the HH (hour) and/or MM (minute), then use the Make Character Higher or Lower keys to change the time. Press the
Confirm key to accept the change.
Set global units of measure
Press the Scroll Down key until Global Units is highlighted. Press the Enter key. Press the Scroll Down key until the
desired units is highlighted. Press the Confirm key to accept the change.
Set temperature units of measure
Press the Scroll Down key until Temp Units is highlighted. Press the Enter key. Press the Scroll Down key until the
desired units is highlighted. Press the Confirm key to accept the change.
Press the Home key. Press the Inputs key.

26
CONFIG
Alarms(1)
Sensor (S1)
Temp (S2)
Config Global Settings

CONFIG
Security Settings

Date 2017-Mar-22
Time 15:49:16
Global Settings
Additional Config Settings:
Display Settings
File Utilities
Controller Details
Config Security Settings

Controller Log Out
Security
Config Display Settings

Home 1
Home 2
Config File Utilities

File Transfer Status
Export Event Log
Config Controller Details

Controller
Product Name
Additional Global Settings:
Global Units
Temperature Units
Alarm Delay
HVAC Modes
Language
Local Password
Additional Security Settings:
Adjust Display
Key Beep
Additional Display Settings:
Import User Config File
Export User Config File
Export System Log
Restore Default Config
Software Upgrade
Additional File Utilities:
Control Board
Software Version
Sensor Board
Software Version
Power Board
Battery Power
Internal Temp 1
Internal Temp 2
Additional Controller Details:

27
CCond (S1)
Alarms
Deadband
InputsCCond (S1)
Details Screen
Content varies with
output type

Inputs
CCond (S1) 0 µS/cm
Temp (S2) 74.7 °F

No Alarms (1)
CCond (S1) 0 µS/cm
Temp (S2) 74.7°F

ECond (S1)
Alarms
Deadband

Temperature (S2)
Alarms
Deadband

pH (S1)
Alarms
Deadband

INPUTS
CCond (S1) Calibration
One Point Process Calibration (All)
One Point Buffer Calibration (CCond,ECond,pH,ORP)
Two Point Buffer Calibration (ECond,pH,ORP)
Three Point Buffer Calibration (pH)
One Point Analog Calibration
Two Point Analog Calibration
Open Air Calibration (Cond)
Zero Calibration (Disinfection)
Contactor Type
Paddlewheel Type
Only Available in some models

ORP (S1)
Alarms
Deadband

Disinfection (S1)
Alarms
Deadband

Generic (S1)
Alarms
Deadband

DI State (D1-D2)
Open Message
Closed Message

Flowmeter (D1-D2)
Totalizer Alarm
Reset Flow Total

Flowmeter (D1-D2))
Alarms
Deadband

Additional Settings for CCond:
Reset Calibration Values
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Default Temp
Temp Compensation
Temp Comp Factor
Cell Constant
Cable Length
Gauge
Units
Name
Type
Additional Settings for ECond:
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Default Temp
Installation Factor
Range
Temp Compensation
Temp Comp Factor
Cell Constant
Cable Length
Gauge
Units
Name
Type
Additional Settings for Temperature:
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Name
Element
Additional Settings for pH:
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Buffers
Default Temp
Cable Length
Gauge
Electrode
Name
Type
Additional Settings for ORP:
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Default Temp
Cable Length
Gauge
Name
Type
Additional Settings for Disinfection:
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Cable Length
Gauge
Sensor
Name
Type
Additional Settings for Generic:
Cal Required Alarm
Alarm Suppression
Smoothing Factor
Sensor Slope
Sensor Offset
Low Range
High Range
Cable Length
Gauge
Units
Electrode (Linear or
Ion Selective)
Name
Type
Additional Settings for DI State:
Interlock
Alarm
Alarm Suppression
Total Time
Reset Total Time
Name
Type
Additional Settings for Flowmeter:
Set Flow Total
Scheduled Reset
Alarm Suppression
Volume/Contact
Flow Units
Name
Type
Additional Settings for Flowmeter:
Alarm Suppression
Totalizer Alarm
Reset Flow Total
Set Flow Total
Scheduled Reset
K Factor
Flow Units
Rate Units
Smoothing Factor
Name
Type

28
On/Off (R1-R3)Settings
HOA Setting
Setpoint
OutputsOn/Off (R1-R3)
Details Screen
Content varies with
output type
Outputs
On/Off (R1-R3) Off
Bleed (R2) Off

OUTPUTS
R1-R3
Only if HVAC mode is disabled
No Alarms (1)
CCond (S1) 0 µS/cm
Temp (S2) 74.7°F

Flow Timer (R1-R3)
HOA Setting
Feed Duration

Bleed and Feed (R1-R3)
HOA Setting
Feed Time Limit

Bleed and Feed (R1-R3)
HOA Setting
Feed Percentage

Percent Timer (R1-R3)
HOA Setting
Sample Period

Biocide Timer (R1-R3)
HOA Setting
Bleed

Alarm (R1-R3)
HOA Setting
Alarm Mode

Only if HVAC mode is enabled
Time Prop (R1-R3)
HOA Setting
Setpoint

Int Sampling (R1-R3)
HOA Setting
Setpoint

Manual (R1-R3)
HOA Setting
Interlock Channels

Pulse Prop (R1-R3)
HOA Setting
Setpoint

Dual Setpoint (R1-R3)
HOA Setting
Setpoint

Probe Wash (R1-R3)
HOA Setting
Input

Timer (R1-R3)

HOA Setting
Add Last Missed
Only if model W120/power relay bd installed
Additional Settings for On/OFF:
Deadband
Duty Cycle Period
Duty Cycle
Output Time Limit
Reset Output Timeout
Interlock Channels
Activate with Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Input
Direction
Name
Mode
Additional Settings for Flow Timer:
Accumulated Volume
Reset Timer
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Flow Input
Name
Mode
Additional Settings for Bleed and Feed:
Output Time Limit
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Bleed
Name
Mode
Additional Settings for Bleed then Feed:
Feed Time Limit
Reset Timer
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Bleed
Name
Mode
Additional Settings for Percent Timer:
Feed Percentage
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Name
Mode
Additional Settings for Biocide Timer:
Event 1 (through 10)
Repetition
Week
Day
Start Time
Duration
Prebleed Time
Prebleed To
Cond Input
Bleed Lockout
Add Last Missed
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Name
Mode
Additional Settings for Alarm:
On Delay Time
Off Delay Time
Output
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Name
Mode
Additional Settings for Time Prop:
Proportional Band
Sample Period
Output Time Limit
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Input
Direction
Name
Mode
Additional Settings for Int Sampling:
Proportional Band
Deadband
Sample Time
Hold Time
Maximum Blowdown
Wait Time
Trap Sample
Output Time Limit
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Cond Input
Name
Mode
Additional Settings for Manual:
Min Relay Cycle
Hand Time Limit
Reset Time Total
Name
Mode
Additional Settings for Pulse Prop:
Proportional Band
Min Output
Max Output
Max Rate
Output Time Limit
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Input
Direction
Name
Mode
Additional Settings for Dual Setpoint:
Set Point 2
Deadband
Duty Cycle Period
Duty Cycle
Output Time Limit
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Input
Direction
Name
Mode
Additional Settings for Probe Wash:
Input 2
Repetition
Week, Day
Events per Day
Start Time
Duration
Sensor Mode
Hold Time
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Name
Mode
Additional Settings for Timer:
Repetition
Week, Day
Events per Day
Start Time
Duration
Interlock Channels
Min Relay Cycle
Hand Time Limit
Reset Time Total
Name
Mode

29
Retransmit (A1)
HOA Setting
4 mA Value
OutputRetrans (A1)

Output
On/Off (R1) Off
Retrans (A1) 0.0%

OUTPUT
A1
No Alarms (1)
CCond (S1) 0 µS/cm
Temp (S2) 74.7°F

Proportional (A1)
HOA Setting
Setpoint

PID (A1)
HOA Setting
Setpoint

Manual (A1)
HOA Setting
Interlock Channels

Details on this page
vary with type of
output
Only available if HVAC is disabled

Additional Settings for Retransmit:
20 mA Value
Hand Output
Interlock Channels
Error Output
Reset Time Total
Input
Name
Mode
Additional Settings for Proportional:
Proportional Band
Min Output
Max Output
Output Time Limit
Interlock Channels
Hand Output
Hand Time Limit
Reset Time Total
Off Mode Output
Error Output
Input
Direction
Name
Mode
Additional Settings for PID:
Gain
Proportional Gain
Integral Time
Integral Gain
Derivative Time
Derivative Gain
Reset PID Integral
Min Output
Max Output
Max Rate
Output Time Limit
Interlock Channels
Hand Output
Hand Time Limit
Off Mode Output
Error Output
Reset Time Total
Input
Direction
Input Min
Input Max
Gain Form
Name
Mode
Additional Settings for Manual:
Min. Relay Cycle
Hand Output
Hand Time Limit
Reset Time Total
Name
Mode
Flow Prop (A1)
Target
Additional Settings for Flow Prop Control Mode:
Pump Capacity
Pump Setting
Specific Gravity
Output Time Limit
Interlock Channels
Hand Output
Hand Time Limit
Off Mode Output
Error Output
Reset Time Total
Flow Input
Name
Mode
HOA Setting

30
Inputs (see section 5.2)
Program the settings for each input
The S1 sensor input will be highlighted. Press the Enter key to get to the Details screen. Press the Settings key. If the
name of the sensor does not describe the type of sensor connected, press the Scroll Down key until Type is high-
lighted. Press the Enter key. Press the Scroll Down key until the correct type of sensor is highlighted, then press the
Confirm key to accept the change. This will bring you back to the Details screen. Press the Settings key again to fin-
ish the rest of the S1 settings. For disinfections sensors, choose the exact sensor in the Sensor menu. For contacting
conductivity sensors, enter the cell constant. Select the units of measure. Enter the alarm set points and alarm dead-
band. Set the default temperature that will be used for automatic temperature compensation if the temperature signal
becomes invalid.
When finished with S1, press the Return key until the list of inputs is displayed. Press the Scroll Down key and
repeat the process for each input.
The S2 temperature input Element should be set correctly once the S1 sensor type has been set. If not, select the cor-
rect temperature element and set the alarm set points and alarm deadband. ORP and disinfection sensors do not have
temperature signals and are preset to No Sensor.
To calibrate the temperature, return to the S2 Details screen, press the Calibrate key, and press the Enter key to perform
a calibration.
If a flow switch or liquid level switch is connected, D1 or D2 should be set to DI State type (if no switch is connected,
select No Sensor). Set the state that will possibly interlock control outputs (refer to the Outputs settings to program
which outputs, if any, will be interlocked by the switch). Set the state, if any, that will result in an alarm.
If a contacting head or paddlewheel flow meter is connected, D1 or D2 should be set to that type (if no flow meter is
connected, select No Sensor). Set the units of measure, volume/contact or K factor, etc.
Calibrate the sensor
To calibrate the sensor, return to the list of inputs, highlight S1, press the Enter key, press the Calibrate key, and
select one of the calibration routines. For disinfection sensors, start with the Zero Calibration. For electrodeless
conductivity, start with the Air Calibration. Refer to section 5.2.
Press the Home key. Press the Outputs key.
Outputs (see section 5.3)
Program the settings for each output
The R1 relay output will be highlighted. Press the Enter key to get to the Details screen. Press the Settings key. If the
name of the relay does not describe the control mode desired, press the Scroll Down key until Mode is highlighted.
Press the Enter key. Press the Scroll Down key until the correct control mode is highlighted, then press the Confirm
key to accept the change. This will bring you back to the Details screen. Press the Settings key again to finish the rest
of the R1 settings.
If you want the output to be interlocked by a flow switch or by another output being active, enter the Interlock Channels
menu and select the input or output channel that will interlock this output.
The default is for the output to be in Off mode, where the output does not react to the settings. Once all settings for
that output are complete, enter the HOA Setting menu and change it to Auto.
Repeat for each output.
Normal Startup
Startup is a simple process once your set points are in memory. Simply check your supply of chemicals, turn on the
controller, calibrate the sensor if necessary and it will start controlling.
4.6 Shut Down
To shut the controller down, simply turn off the power. Programming remains in memory.

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5.0 OPERATION
These units control continuously while power is applied. Programming is accomplished via the local keypad and dis-
play.
To see the top level menu keys, press the Home key if not already there. The menu structure is grouped by Alarms, Inputs,
Outputs, and configuration Settings. Each input has its own menu for calibration and unit selection as needed. Each output
has its own setup menu including set points, timer values and operating modes as needed. Under Settings will be general
settings such as the clock, the language, etc.
Keep in mind that even while moving through menus, the unit is still controlling.
5.1 Alarms Menu
Press the key below the Alarms icon to view a list of active alarms. If there are more than two active alarms, the Page
Down icon will be shown, and this key press will bring up the next page of inputs.
Press the Back/Return button to go back to the previous screen.
5.2 Inputs Menu
Press the key below the Inputs icon to view a list of all sensor and digital inputs. The Page Down icon scrolls down the
list of inputs, the Page Up icon scrolls up the list of inputs, the Return icon brings back the previous screen.
Press the Enter key with an input highlighted to access that input’s details, calibration (if applicable) and settings.
Sensor Input Details
The details for any type of sensor input include the current value read, alarms, the raw (uncalibrated) signal, the sensor
type, and the calibration gain and offset. If the sensor has automatic temperature compensation, then the sensor’s
temperature value and alarms, the temperature resistance value read, and the type of temperature element required are
also displayed.
Calibration
Press the Calibration key to calibrate the sensor. Select the calibration to perform: One Point Process, One Point Buffer or
Two Point Buffer Calibration. Not all calibration options are available for all types of sensor.
One Point Process Calibration
New Value
Enter the actual value of the process as determined by another meter or laboratory analysis and press Confirm.
Cal Successful or Failed
If successful, press Confirm to put the new calibration in memory.
If failed, you may retry the calibration or cancel. Refer to Section 7 to troubleshoot a calibration failure.
One Point Buffer Calibration, Conductivity Air Cal
Cal Disables Control
Press Confirm to continue or Cancel to abort
Buffer Temperature (only appears if no temperature sensor is detected for sensor types that use automatic
temperature compensation)
Enter the temperature of the buffer and press Confirm.

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Buffer Value (only appears for One Point Calibration except when automatic buffer recognition is used)
Enter the value of the buffer being used
Rinse Sensor
Remove the sensor from the process, rinse it off, and place it in the buffer solution (or oxidizer-free water for Zero
Cal, or air for the conductivity open air cal). Press Confirm when ready.
Stabilization
When the temperature (if applicable) and signal from the sensor is stable, the controller will automatically move to
the next step. If they don’t stabilize you may manually go to the next step by pressing Confirm.
If successful, press Confirm to put the new calibration in memory.
If failed, you may retry the calibration or cancel. Refer to Section 7 to troubleshoot a calibration failure.
Resume Control
Replace the sensor in the process and press Confirm when ready to resume control.
Two Point Buffer Calibration
Cal Disables Control
Press Confirm to continue or Cancel to abort
Buffer Temperature (only appears if no temperature sensor is detected for sensor types that use automatic
temperature compensation)
First Buffer Value (does not appear if automatic buffer recognition is used)
Enter the value of the buffer being used.
Rinse Sensor
Remove the sensor from the process, rinse it off, and place it in the buffer solution. Press Confirm when ready.
Stabilization
Second Buffer Temperature (only appears if no temperature sensor is detected for sensor types that use auto-
matic temperature compensation)
Second Buffer Value
Enter the value of the buffer being used
Rinse Electrode
Remove the sensor from the process, rinse it off, and place it in the buffer solution. Press Confirm when ready.
Stabilization
If successful, press Confirm to put the new calibration in memory. The calibration adjusts the offset and the gain
(slope) and displays the new values. If failed, you may retry the calibration or cancel. Refer to Section 7 to trouble-
shoot a calibration failure.
Resume Control
Replace the sensor in the process and press Confirm when ready to resume control.

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5.2.1 Contacting Conductivity
Settings
Press the Settings key view or change the settings related to the sensor.
Alarms Low-Low, Low, High and High-High Alarms limits may be set.
Deadband This is the Alarm Deadband. For example, if the High Alarm is 3000, and the deadband is
10, the alarm will activate at 3001 and deactivate at 2990.
Reset Calibration
Values
Enter this menu to reset the sensor calibration back to factory defaults.
Cal Required Alarm To get an alarm message as a reminder to calibrate the sensor on a regular schedule, enter
the number of days between calibrations. Set it to 0 if no reminders are necessary.
Alarm Suppression If any of the relays or digital inputs are selected, any alarms related to this input will be
suppressed if the selected relay or digital input is active. Typically this is used to prevent
alarms if there is no sample flow past the flow switch digital input.
Smoothing Factor Increase the smoothing factor percentage to dampen the response to changes. For exam-
ple, with a 10% smoothing factor, the next reading shown will consist of an average of
10% of the previous value and 90% of the current value.
Default Temp If the temperature signal is lost at any time, then the controller will use the Default Temp
setting for temperature compensation.
Cable Length The controller automatically compensates for errors in the reading caused by varying the
length of the cable.
Gauge The cable length compensation depends upon the gauge of wire used to extend the cable
Cell Constant Change the cell constant to match the sensor connected.
Temp Comp Select between the standard NaCl temperature compensation method or a linear %/ de-
gree C method.
Comp Factor This menu only appears if Linear Temp Comp is selected. Change the %/degree C to
match the chemistry being measured. Standard water is 2%.
Units Select the units of measure for the conductivity.
Name The name used to identify the sensor may be changed.
Type Select the type of sensor to be connected.
5.2.2 Electrodeless Conductivity
Settings
Reset Calibration
Values
Alarm Suppression If any of the relays or digital inputs are selected, any alarms related to this input will be
suppressed if the selected relay or digital input is active. Typically this is used to prevent
alarms if there is no sample flow past the flow switch digital input.

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Cable Length The controller automatically compensates for errors in the reading caused by varying the
length of the cable.
Gauge The cable length compensation depends upon the gauge of wire used to extend the cable
Cell Constant Do not change unless instructed by the factory. The default value is 6.286
Range Select the range of conductivity that best matches the conditions the sensor will see.
Installation Factor Do not change unless instructed by the factory. The default value is 1.000.
Default Temp If the temperature signal is lost at any time, then the controller will use the Default Temp
setting for temperature compensation.
Temp Comp Select between the standard NaCl temperature compensation method or a linear %/ de-
gree C method.
Comp Factor This menu only appears if Linear Temp Comp is selected. Change the %/degree C to
match the chemistry being measured. Standard water is 2%.
Units Select the units of measure for the conductivity.
Type Select the type of sensor to be connected.
5.2.3 Temperature
Settings
Reset Calibration
Values
Alarm
Suppression
If any of the relays or digital inputs are selected, any alarms related to this input will be
suppressed if the selected relay or digital input is active.
Element Select the specific type of temperature sensor to be connected.
5.2.4 DI State
Input Details
The details for this type of input include the current state with a custom message for open versus closed, alarms, and
the status of the interlock.
Settings
Open Message The words used to describe the switch state may be customized.
Closed Message The words used to describe the switch state may be customized.
Interlock Choose whether the input should be in the interlocked state when the switch is either
open or closed.

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Total Time Choose to totalize the amount of time that the switch has been open or closed. This will
be displayed on the input details screen.
Reset Total Time Enter this menu to reset the accumulated time to zero. Press Confirm to accept, Cancel to
leave the total at the previous value and go back.
Alarm Choose if an alarm should be generated when the switch is open, or closed, or if no alarm
should ever be generated.
Alarm
Suppression
Name The name used to identify the switch may be changed.
Type Select the type of sensor to be connected to the digital input channel.
5.2.5 Flow Meter, Contactor Type
Input Details
The details for this type of input include the total volume accumulated through the flow meter and alarms.
Settings
Totalizer Alarm A high limit on the total volume of water accumulated may be set.
Alarm
Suppression
Reset Flow Total Enter this menu to reset the accumulated flow total to 0. Press Confirm to accept, Cancel to
Set Flow Total This menu is used to set the total volume stored in the controller to match the register on
the flow meter. Enter the desired value.
Scheduled Reset Choose to automatically reset the flow total, and if so, Daily, Monthly or Annually.
Volume/Contact Enter the volume of water that needs to go through the flow meter in order to generate a
contact closure.
Flow Units Select the units of measure for the water volume.
5.2.6 Flow Meter, Paddlewheel Type
Input Details
The details for this type of input include the current flow rate, total volume accumulated through the flow meter and
alarms.
Settings
Alarms Low and High Alarm limits may be set.
Alarm
Suppression
Totalizer Alarm A high limit on the total volume of water accumulated may be set.
Reset Flow Total Enter this menu to reset the accumulated flow total to 0. Press Confirm to accept, Cancel to
Set Flow Total This menu is used to set the total volume stored in the controller to match the register on
the flow meter. Enter the desired value.
Scheduled Reset Choose to automatically reset the flow total, and if so, Daily, Monthly or Annually.

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K Factor Enter the pulses generated by the paddlewheel per unit volume of water.
Flow Units Select the units of measure for the water volume.
Rate Units Select the units of measure for the flow rate time base.
5.3 Outputs Menu
Press the key below the Outputs icon to view a list of all relay and analog outputs. The Page Down icon scrolls down
the list of outputs, the Page Up icon scrolls up the list of outputs, the Return icon brings back the previous screen.
Press the Enter key with an output highlighted to access that output’s details and settings.
NOTE: When the output control mode or the input assigned to that output is changed, the output reverts to OFF mode. Once
you have changed all settings to match the new mode or sensor, you must put the output into AUTO mode to start control.
5.3.1 Relay, Any Control Mode
Output Details
The details for this type of output include the relay on/off state, HOA mode or Interlock status, accumulated on-time,
alarms, current cycle on time and relay type.
Settings
Press the Settings key view or change the settings related to the relay. Settings that are available for any control mode
include:
HOA Setting Select Hand, Off or Auto mode (see section 4.4).
Output Time Limit Enter the maximum amount of time that the relay can be continuously activated. Once the
time limit is reached, the relay will deactivate until the Reset Output Timeout menu is entered.
Reset Output Timeout Enter this menu to clear an Output Timeout alarm and allow the relay to control the
process again.
Interlock Channels Select the relays and digital inputs that will interlock this relay, when those other relays
are activated in Auto mode. Using Hand or Off to activate relays bypasses the Interlock
logic.
Activate With Channels Select the relays and digital inputs that will activate this relay, when those other relays
are activated in Auto mode. Using Hand or Off to activate relays bypasses the Activate
With logic.
Min Relay Cycle This menu allows for the use of a motorized ball valve that needs time to fully open
and close. Enter the number of seconds that the valve needs to fully actuate.
Hand Time Limit Enter the amount of time that the relay will activate for when it is in Hand mode.
Reset Time Total Press the Confirm icon to reset the total accumulated on-time stored for the output back to 0.
Name The name used to identify the relay may be changed.
Mode Select the desired control mode for the output.
5.3.2 Relay, On/Off Control Mode
Output Details
Settings
Press the Settings key view or change the settings related to the relay.
Set point Enter the sensor process value at which the relay will activate.

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Deadband Enter the sensor process value away from the set point at which the relay will deactivate.
Duty Cycle Period Using a duty cycle helps to prevent overshooting the set point in applications where the
response of the sensor to chemical additions is slow. Specify the amount of time for the
cycle, and the percentage of that cycle time that the relay will be active. The relay will be
off for the rest of the cycle, even if the set point has not been satisfied.
Enter the length of the duty cycle in minutes:seconds in this menu. Set the time to 00:00
if use of a duty cycle is not required.
Duty Cycle Enter the percentage of the cycle period that the relay will be active. Set the percentage to
100 if use of a duty cycle is not required.
Input Select the sensor to be used by this relay.
Direction Select the control direction.
5.3.3 Relay, Flow Timer Control Mode
Output Details
Settings
Feed Duration Enter the amount of time for the relay to activate for once the accumulated volume
through the water meter has been reached.
Accumulated Volume Enter the volume of water to pass through the water meter required to trigger the chemical feed.
Flow Input Select the input to be used to control this output.
Reset Timer Use this menu to cancel the current feed cycle.
5.3.4 Relay, Bleed and Feed Control Mode
ONLY AVAILABLE IF HVAC MODES ARE ENABLED IN CONFIG MENU – GLOBAL SETTINGS
Output Details
Settings
Feed Time Limit Enter the maximum amount of feed time per bleed event
Bleed Select the relay to be used for Bleed/Blowdown
5.3.5 Relay, Bleed then Feed Control Mode
Output Details
Settings
Feed Percentage Enter the % of bleed relay activation time to use for the feed relay activation time
Feed Time Limit Enter the maximum amount of feed time per bleed event
Reset Timer Use this menu to cancel the current feed cycle.

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5.3.6 Relay, Percent Timer Control Mode
Output Details
The details for this type of output include the relay on/off state, HOA mode or Interlock status, cycle time, accumulated
on-time, alarms, current cycle on time and relay type.
Settings
Sample Period Enter the duration of the sample period.
Feed Percentage Enter the % of the sample period time to use for the feed relay activation time
5.3.7 Relay, Biocide Timer Control Mode
Basic Biocide Operation
When a biocide event triggers, the algorithm will first prebleed (if a prebleed is programmed) for the set amount of
prebleed time or down to the set prebleed conductivity. Then the biocide relay is turned on for the set duration. This
is followed by a post-bio add lockout that blocks the bleed relay from turning on for a set amount of bleed lockout
time.
Special Condition Handling
Prebleed
If both a time limit and a conductivity limit are set, the time limit takes precedence. The bleed relay will turn off
once the time limit is reached or when the prebleed conductivity limit is reached (whichever occurs first). If the
prebleed has a conductivity limit set, then the time limit can’t be set to zero, as this would allow the prebleed to
last forever if the conductivity limit is never reached.
Overlapping biocide events
If a second biocide event occurs while the first one is still active (in pre-bleed, biocide add or lockout), the
second event will be ignored. An Event Skipped alarm will be set.
Interlock Conditions
Interlocks override the relay control, but do not change the operation of the timer control.
A no-flow (or other interlock) condition does not delay a biocide add. The biocide add duration timer will
continue even if the relay is locked out due to a no-flow or other interlock condition. This will prevent delayed
biocide adds which can potentially cause higher than expected biocide concentrations in the system when two
biocides adds occur close to the same time. Not allowing delayed biocide adds will also prevent incompatible
biocides getting added at close to the same time.
“Activate With” Conditions
“Activate with channels” settings override the relay control, but do not change the operation of the timers or
related bleed control. The biocide timer continues counting biocide add time when the biocide relay is forced
on, and ends at the expected time (biocide event start time plus duration). If the “activate with” condition con-
tinues after the end of the biocide feed time, the relay remains activated.
Alarms
An Event Skipped alarm is set when a second biocide event occurs while one event is still running (either in
prebleed, biocide add or post-biocide add lockout). An Event Skipped alarm is also set when the biocide add
relay never turns on during a biocide add because of an interlock condition.
The alarm is cleared when the relay is next activated for any reason (the next timer event or HAND mode or
“activate with” force on condition).
Output Details
alarms, current cycle on time and relay type. The current week number and day of the week is displayed (even if
there is no multi-week repetition event programmed). Cycle Time shows the time counting down of the currently
active part of the biocide cycle (pre-bleed, biocide feed, or post biocide feed lockout of the bleed).

39
Settings
Event 1 (through 10) Enter these menus to program timer events via the menus below:
Repetition Select the time cycle to repeat the event: Daily, 1 Week, 2 Week, 4 Week, or None. An
event means that the output is turned on at the same time of day, for the same amount
of time, and except for the Daily cycle, on the same day of the week.
Week Only appears if Repetition is longer than 1 Week. Select the week during which the
event will occur.
Day Only appears if Repetition is longer than Daily. Select the day of the week during
which the event will occur.
Start Time Enter the time of day to start the event.
Duration Enter the amount of time that the relay will be on.
Prebleed Time If lowering the conductivity prior to feeding biocide is desired using a fixed time instead
of a specific conductivity setting, enter the amount of time for the prebleed. Also may be
used to apply a time limit on a conductivity based prebleed.
Prebleed To If lowering the conductivity prior to feeding biocide is desired, enter the conductivity
value. If no prebleed is required, or if a time-based prebleed is preferred, set the
conductivity value to 0.
Cond Input Select the sensor to be used to control the prebleed relay selected above.
Bleed Lockout Enter the amount of time to lockout bleed after the biocide feed is complete.
Add Last Missed Select Enabled if the controller should delay start the most recent Biocide cycle until
immediately after an Interlock clears, or Disabled if all Biocide feed should be skipped
if there is an Interlock condition at the time the add was due to start.
5.3.8 Relay, Alarm Mode
Output Details
Settings
Alarm Mode Select the alarm conditions that will put the relay into the alarm state:
All Alarms
S1 Low Alarms (+LoLo Alarm, Sensor Range Error, or Sensor Fault)
S1 High Alarms (+HiHi Alarm, Sensor Range Error, or Sensor Fault)
S2 (Temperature) Low Alarms (+LoLo Alarm, Sensor Range Error, or Sensor Fault)
S2 (Temperature) High Alarms (+HiHi Alarm, Sensor Range Error, or Sensor Fault)
D1 Alarms (Flowswitch/State, Flow Total, Flowmeter Range)
D2 Alarms (Flowswitch/State, Flow Total, Flowmeter Range)
Relay Alarms (Output Timeout, Control Failure, Event Skipped) for ALL relays
On Delay Time Enter the delay time for relay activation in hours:minutes:seconds. Set the time to
00:00:00 to immediately activate the relay.
Off Delay Time Enter the delay time for relay deactivation in hours:minutes:seconds. Set the time to
00:00:00 to immediately deactivate the relay.
Output Select if the relay will be active when in the alarm state (Normally Open) or if the relay
will be active when not in the alarm state (Normally Closed).

40
5.3.9 Relay, Time Proportional Control Mode
Output Details
Settings
Set point Enter the sensor process value at which the relay will be off for the entire Sample Period.
Proportional Band Enter the distance that the sensor process value is away from the set point at which the
relay will be on for the entire Sample Period.
Sample Period Enter the duration of the sample period.
5.3.10 Relay, Intermittent Sampling Control Mode
In an Intermittent Sampling with Proportional Blowdown control mode, the controller reads an analog input on a
timed schedule, and the relay responds to maintain the conductivity value at the set point by activating for a program-
mable amount of time that varies with the deviation from the set point.
The relay goes through a sequence of activation/deactivation as described below. The intended purpose of this
algorithm is boiler blowdown. A sample cannot be supplied to the sensor continuously in many boilers because a
recirculating loop is not possible, and it would be a waste of hot water to constantly run a sample to a drain. A valve
is opened intermittently to supply a sample to the sensor.
Where a non-ideal installation of the sensor can cause the sample to flash to steam, and give a false low reading, this
can be corrected by taking the reading with the sample held in the pipe with the sampling valve closed, so the sample
is at boiler pressure and therefore back in the liquid state. Enable Trap Sample if this is the case. Because the con-
ductivity reading cannot be trusted while the valve is open, the blowdown is timed rather than in direct response to a
sensor reading. Rather than relying upon a fixed time, where the blowdown could be much longer than necessary if
the reading is just barely off the set point value, proportional blowdown adjusts the time appropriately.
If Trap Sample is Disabled, then the blowdown is not timed, and the Hold Time and Maximum Blowdown time are
not used. The blowdown valve will stay open until the conductivity is below set point. In this case the Output Time
Limit menu is available to stop the blowdown if the sensor is unresponsive.
Note that the software will not allow two relays using Intermittent Sampling to be assigned to the same sensor input;
the previous relay set up will change to Off mode.
Output Details
The details for this type of output include the relay on/off state, relay status (HOA mode, Interlock status, Intermit-
tent Sampling cycle step, etc.), time remaining for the active Intermittent Sampling cycle step, alarms, current cycle
on time and relay type.
Settings
Set point Enter the conductivity value below which the controller will not start a blowdown cycle.
Proportional Band (only shown if trap sample is enabled) Enter the conductivity value above the set point at
which the maximum blowdown time will occur. For example, if the Set point is 2000 uS/
cm, and the Proportional Band is 200 uS/cm, then if the conductivity is above 2200 uS/
cm the blowdown valve will open for the Maximum Blowdown time described below. If
the conductivity of the trapped sample is 2100 uS/cm, the blowdown valve will open for
half the Maximum Blowdown time.

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Deadband (only shown if trap sample is disabled) Enter the sensor process value away from the set
point at which the relay will deactivate.
Sample Time Enter the length of time the blowdown valve will be open in order to capture a fresh
sample of boiler water.
Hold Time (only shown if trap sample is enabled) Enter the length of time the blowdown valve will
be closed in order to ensure that the captured sample is at boiler pressure.
Maximum Blowdown (only shown if trap sample is enabled) Enter the maximum length of time that the
blowdown valve will be open, when the conductivity of the captured sample is above the
set point plus the proportional band.
Cond Input Select the sensor to be used by this relay.
Wait Time Enter the time to wait to sample the water again once the captured sample is below set point.
Trap Sample Enable or disable trapping of the sample.
5.3.11 Relay or Analog Output, Manual Mode
Output Details
The details for this type of output include the relay on/off state or analog output %, HOA mode or Interlock status,
accumulated on-time, alarms, current cycle on time and relay type.
Settings
A Manual relay will activate if the HOA mode is Hand, or if it is Activated With another channel. There are no addition-
al programmable parameters.
5.3.12 Relay, Pulse Proportional Control Mode
ONLY AVAILABLE IF W120 MODEL/POWER RELAY BOARD IS INSTALLED
Output Details
The details for this type of output include the relay pulse rate, HOA mode or Interlock status, accumulated on-time,
Settings
Set point Enter the sensor process value at which the output will pulse at the Minimum Output %
set below.
Proportional Band Enter the distance that the sensor process value is away from the set point beyond which
the output will be pulsing at the Maximum Output % set below.
Minimum Output Enter the lowest possible pulse rate as a percentage of the Maximum Stroke Rate set
below (normally 0%).
Maximum Output Enter the highest possible pulse rate as a percentage of the Maximum Stroke Rate set below.
Maximum Rate Enter the maximum pulse rate that the metering pump is designed to accept (10 - 2400
pulse/minute range).
Direction Set the control direction.
5.3.13 Relay, Dual Set Point Mode
Output Details
Settings

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Set point Enter the first sensor process value at which the relay will activate.
Set point 2 Enter the second sensor process value at which the relay will activate.
Deadband Enter the sensor process value away from the set point at which the relay will deactivate.
Duty Cycle Period Using a duty cycle helps to prevent overshooting the set point in applications where the
response of the sensor to chemical additions is slow. Specify the amount of time for the
cycle, and the percentage of that cycle time that the relay will be active. The relay will be
off for the rest of the cycle, even if the set point has not been satisfied.
Enter the length of the duty cycle in minutes:seconds in this menu. Set the time to 00:00 if
use of a duty cycle is not required.
Duty Cycle Enter the percentage of the cycle period that the relay will be active. Set the percentage to
100 if use of a duty cycle is not required.
Direction Select the control direction. In Range will activate the relay when the input reading is
between the two set points. Out of Range will activate the relay when the input reading is
outside the two set points.
5.3.14 Relay, Probe Wash Control Mode
Basic Timer Operation
When a Probe Wash event triggers, the algorithm will activate the relay for the programmed time. The relay will
activate a pump or valve to supply a cleaning solution to the sensor or sensors. The output of the selected sensors will
either be held or disabled during the cleaning cycle, and for a programmable hold time after the cleaning cycle.
Special Condition Handling
Overlapping timer events
If a second timer event occurs while the first one is still active, the second event will be ignored. An Event
Skipped alarm will be set.
Interlock Conditions
Interlocks override the relay control, but do not change the operation of the timer control.
A digital input or output interlock condition does not delay the relay activation. The relay activation duration
timer will continue even if the relay is deactivated due to an interlock condition. This will prevent delayed
events which can potentially cause problems in they do not occur at the correct time.
“Activate With” Conditions
“Activate with channels” settings override the relay control, but do not change the operation of the timer
control. The relay activation duration timer continues counting when the timer relay is forced on, and ends at the
expected time (event start time plus duration). If the “activate with” condition continues after the end of the event
time, the relay remains activated.
Alarms
An Event Skipped alarm is set when a second timer event occurs while one event is still running. An Event
Skipped alarm is also set when the timer relay never turns on during an event because of an interlock condition.
The alarm is cleared when the relay is next activated for any reason (the next timer event or HAND mode or
“activate with” force on condition).
Output Details
alarms, current cycle on time and relay type. The current week number and day of the week is displayed (even if
there is no multi-week repetition event programmed). Cycle Time shows the time counting down of the currently
active part of the cycle.
Settings

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Event 1 (through 10) Enter these menus to program timer events via the menus below:
Repetition Select the time cycle to repeat the event: Hourly, Daily, 1 Week, 2 Week, 4 Week, or
None. An event means that the output is turned on at the same time of day, for the same
amount of time, and except for the Daily cycle, on the same day of the week.
Week Only appears if Repetition is longer than 1 Week. Select the week during which the event
will occur.
Day Only appears if Repetition is longer than Daily. Select the day of the week during which
the event will occur.
Events Per Day Only appears if Repetition is Hourly. Select the number of events per day. The events
occur on the Start Time and then evenly spaced throughout the day.
Start Time Enter the time of day to start the event.
Duration Enter the amount of time that the relay will be on.
Input Select the sensor that will be washed.
Input 2 Select the second sensor, if applicable, that will be washed.
Sensor Mode Select the effect that the probe wash event will have on any control outputs that use the
sensor(s) being washed. The options are to either Disable the sensor readings (turn the
control output off) or Hold the sensor reading at the last valid sensor reading prior to the
start of the probe wash event.
Hold Time Enter the amount of time needed to hold the sensor reading after the event has finished, in
order for the wash solution to be replaced by process solution.
5.3.15 Analog Output, Retransmit Mode
Output Details
The details for this type of output include the output %, HOA mode or Interlock status, accumulated on-time, alarms,
current cycle on time and relay type
Settings
Press the Settings key view or change the settings related to the analog output.
4 mA Value Enter the process value to correspond to a 4 mA output signal.
20 mA Value Enter the process value to correspond to a 20 mA output signal.
Hand Output Enter the output % desired when the output is in Hand mode.
Input Select the sensor input to retransmit.
Error Output Enter the output mA desired when the sensor is not giving the controller a valid signal.
The acceptable range is 0 to 21 mA.
5.3.16 Analog Output, Proportional Control Mode
Output Details
The details for this type of output include the output %, HOA mode or Interlock status, accumulated on-time, alarms,
current cycle on time and relay type.
Settings
Press the Settings key view or change the settings related to the analog output.
Set point Enter the sensor process value at which the output % will be the programmed minimum %.
Proportional Band Enter the sensor process value away from the set point at which the output % will be the
programmed maximum %.
Minimum Output Enter the lowest output %. If the output should be off at the set point, this will be 0%.
Maximum Output Enter the highest output %.

44
Input Select the sensor input to use for proportional control.
Off Mode Output Enter the output mA value desired when the output is in Off mode, or being Interlocked, or
during a calibration of the sensor being used as an input. The acceptable range is 0 to 21 mA.
5.3.17 Analog Output, Flow Proportional Mode
Overview
In Flow Proportional control mode, the controller monitors the rate of flow through a digital flow meter, and continu-
ously adjusts the analog (4-20 mA) output proportional band to achieve a target PPM level.
The user enters the target PPM and the data necessary to calculate the proportional band (the water flow rate at which
the maximum pulse rate will occur) required to maintain the target PPM with that flow rate of water.
% output = Target PPM x Water Flow Rate (liter/min or gal/min)
Pump Capacity (liter or gal/hr) x Pump Setting (%) x Specific Gravity x 166.67
% output = Target PPM x Water Flow Rate (m3⁄min)
Pump Capacity (liter/hr) x Pump Setting (%) x Specific Gravity x 0.16667
Control Operation
If the output is continuously on for longer than the Output Time Limit, then output will deactivate.
Output Details
The details for this type of output include the output %, HOA mode or Interlock status, alarms related to this output,
current cycle on time, total accumulated on-time, mA output, and the current control mode setting.
Settings
Touch the Settings icon to view or change the settings related to the relay.
Target Enter the desired PPM set point for the product.
Pump Capacity Enter the maximum flow rate for the metering pump.
Pump Setting Enter the stroke length setting for the metering pump, in percent.
Specific Gravity Enter the specific gravity of the product to be added.
Off Mode Output Enter the output mAvalue desired when the output is in Off mode, or being Interlocked, or
during a calibration of the sensor being used as an input. The acceptable range is 0 to 21 mA.
Flow Input Select the flow meter to be used as an input for this control relay.

45
5.4 Settings Menu
The configuration Settings Menu is used for settings and activities that are not tied to Inputs or Outputs.
5.4.1 Global Settings
Date Enter the current year, month and day.
Time Enter the current hour (military time), minute, and second.
Global Units Select the units to be used for cable length and wire gauge settings, metric or Imperial.
Temperature Units Select between Fahrenheit and Celsius.
Alarm Delay Enter how much time to wait after powering up the controller before alarm conditions are
considered valid.
HVAC Modes Enable HVAC modes for cooling tower and boiler applications where the relay control
modes for Biocide timer, Bleed and Feed, Bleed then Feed, and Intermittent Sampling are
required. Disable HVAC Modes if these control modes are not necessary and a more generic
timer control mode will replace the Biocide timer.
Language Select the language the software will use
5.4.2 Security Settings
Controller Log Out When Security is Enabled, and after the password has been entered, the controller requires
immediate use of a password to calibrate or change settings. Once finished making changes,
log out to prevent unauthorized changes by someone else. If not manually logged out, the
controller will automatically log out after 10 minutes of inactivity.
Security Select Enable to require a password in order to calibrate or change settings, or Disable to
allow calibration and set point changes without a password. In order to Enable security, the
default password must be entered first, then select Enable, then press the Confirm key.
Local Password Used to change the password needed for full configuration capability if Security has been
enabled. The default local password is 5555. This can and should be changed using this
menu if Security is enabled.
5.4.3 Display Settings
Home 1 Select the input or output to display on the 1st
line of the display Home screen.
Home 2 Select the input or output to display on the 2nd
line of the display Home screen.
Adjust Display Change the contrast using the arrow keys.
Key Beep Select enable to hear a beep when a key is pressed, or disable for silence
5.4.4 File Utilities
File Transfer Status Displays the status of the last attempt to export a file
Export Event Log Save the Event Log file to a USB stick. This records set point changes, user calibrations,
alarms, relay state changes, file exports, etc.
Export System Log Save the System Log file to a USB stick. This records hardware changes, software
upgrades, automatic calibrations, power loss, system-level issues, etc.
Import User Config
File
Remove power from the controller and insert a USB stick that contains the settings that
you want to import to this controller (see Export User Config file below). Press the Enter
key and then press the Confirm key to transfer those settings to this controller.

46
Export User Config
File
The User Configuration file contains all settings for the controller. Enter this menu to
save the controller’s settings to a USB stick for using later to restore settings to this
controller, or to program additional controllers with the same settings as this one. It
takes several minutes to create the file and transfer it to the stick. Remove power from
the controller and insert a USB stick. Press the Enter key and then press the Confirm key
to transfer a file containing the controller’s settings to the USB stick.
Restore Default Config Enter this menu to restore all of the settings to the factory default values. Any changes to
settings that were previously made will be lost!
Software Upgrade Remove power from the controller and insert an USB stick that has the upgrade file
stored in the root directory into the USB connector (see figure 7). Restore power, press
the Enter key from the software upgrade menu, and then press the Confirm key to start
the upgrade.
NOTE: Remove power before inserting or removing the USB stick!
5.4.5 Controller Details
Controller Displays the name for the group of default settings used as built
Product Name Displays the model of the controller as built
Control Board Displays the revision number of the front panel circuit board
Software Version Displays the software version on the control board
Sensor Board Displays the revision number of the sensor board
Software Version Displays the software version on the sensor board
Power Board Displays the revision number of the power/relay board
Battery Power Displays the VDC output of the battery that is used to hold the date and time. The acceptable
range is 2.4-3.2 VDC.
Processor Temp Displays the temperature of the main processor. The acceptable range is -10 to 65 C.
Sensor Temp Displays the temperature of the sensor input processor. The acceptable range is -10 to 65 C.

47
6.0 MAINTENANCE
The controller itself requires very little maintenance. Wipe with a damp cloth. Do not spray down the controller unless
the enclosure door is closed and latched.
6.1 Conductivity Sensor Cleaning
NOTE: The controller must be recalibrated after cleaning the sensor.
Frequency
The sensor should be cleaned periodically. The frequency required will vary by installation. In a new installation, it is
recommended that the sensor be cleaned after two weeks of service. Electrodeless conductivity sensors are much less
sensitive to coatings and should go longer between cleanings. To determine how often the sensor must be cleaned, fol-
low the procedure below.
1. Read and record the conductivity.
2. Remove, clean and replace the conductivity sensor.
3. Read conductivity and compare with the reading in step 1 above.
If the variance in readings is greater than 5%, increase the frequency of sensor cleaning. If there is less than 5% change
in the reading, the sensor was not dirty and can be cleaned less often.
Cleaning Procedure
The sensor can normally be cleaned using a cloth or paper towel and a mild detergent. If coated with scale, clean with
a dilute (5%) solution of hydrochloric acid solution.
Occasionally an electrode may become coated with various substances that require a more vigorous cleaning procedure.
Usually the coating will be visible, but not always.
To clean a severely coated electrodeless conductivity sensor, scrub with a toothbrush or stiff bottlebrush. Soap or hand
cleaner may help. If coated with scale, clean with a dilute (5%) hydrochloric acid solution. Harsh abrasives should be
avoided. Rinse the sensor thoroughly before returning to service.
To clean a severely coated flat surface cooling tower electrode, use fine grit abrasive, such as emery paper. Lay the paper
on a flat surface and move the electrode in a back and forth motion. The electrode should be cleaned parallel to the carbon
electrodes, not perpendicular.
Clean in this
direction
Figure 14 Cleaning a flat contacting conductivity electrode
Replacing the Fuse
CAUTION: Disconnect power to the controller before opening front panel!

48
Models that include powered relays have a fuse to protect the controller from devices connected to the relays that
draw excessive current. Locate the fuse on the circuit board at the back of the controller enclosure, underneath the
clear cover (see figure 7). Gently remove the old fuse from its retaining clip and discard. Press the new fuse into
the clip, replace the clear cover, secure the front panel of the controller and return power to the unit.
Warning: Use of non-approved fuses can affect product safety approvals. Specifications are shown below. To
insure product safety certifications are maintained, it is recommended that a Walchem fuse be used.
F1 Fuse Walchem P/N
5 x 20 mm, 6.3A, 250V 102834
7.0 TROUBLESHOOTING
CAUTION: Disconnect power to the controller before opening front panel!
Troubleshooting and repair of a malfunctioning controller should only be attempted by qualified personnel using caution
to ensure safety and limit unnecessary further damage. Contact the factory.
7.1 Calibration Failure
Calibrations will fail if the adjustments to the reading are outside of the normal range for a properly functioning system.
Refer to the instruction manual for the specific sensor being used for further information.
7.1.1 Contacting Conductivity Sensors
The calibration will fail if the adjustment to the gain is outside of 0.5 to 2.0.
Possible Cause Corrective Action
Dirty electrode Clean electrode
Improper wiring of sensor to controller Correct wiring
Wrong cell constant entered Program the controller cell constant setting at the value
that matches the electrode being used
Incorrect temperature reading or setting Ensure that the temperature is accurate
Incorrect cable length or wire gauge setting Set to the correct values
Faulty electrode Replace electrode
7.1.2 Electrodeless Conductivity Sensors
The calibration will fail if the adjustment to the gain is outside of 0.2 to 10, or the offset is outside of -10,000 to
10,000.
Dirty sensor Clean sensor
Improper wiring of sensor to controller Correct wiring
Sensor placed too close to container walls Relocate sensor
Sensor placed in the direct path of electrical current flow Relocate sensor
Incorrect temperature reading or setting Ensure that the temperature is accurate
Incorrect cable length or wire gauge setting Set to the correct values
Faulty sensor Replace sensor

49
7.2 Alarm Messages
Alarm messages will include the Name of the input or output as defined in the Settings menu, the hardware identifying
type and number (S for sensor input, D for digital input, R for relay output, A for analog output), and the type of alarm.
HIGH or HIGH-HIGH ALARM
Occurs if the conductivity rises above the high conductivity alarm set points. If your unit is programmed for an
alarm relay output, the alarm relay will activate. The controller will continue to check the conductivity, and any
outputs using the conductivity sensor will remain active.
Dirty sensor Clean sensor (see Section 6.1)
Faulty bleed solenoid valve Repair or replace solenoid valve
Improper wiring of valve or controller Correct wiring
Conductivity rose over alarm limit while biocide
lockout occurred
Allow normal bleed to occur
Clogged Y-strainer in bleed line Clean Y-strainer
Infrequent intermittent sampling Sample more often
Faulty bleed relay Replace power relay board
LOW or LOW-LOW ALARM
Occurs if the conductivity drops below the low conductivity alarm set points. If your unit is programmed for an
alarm relay output, the alarm relay will activate. The controller will continue to check the conductivity, and any
outputs using the conductivity sensor will remain active.
Sensor disconnected Reconnect. Check cable for continuity.
Sensor dry Check tee for obstruction. Verify flow. Change location of elec-
trode.
Pre-bleed set too low Check pre-bleed setting
Solenoid valve stuck open Repair or replace solenoid valve
Faulty electrode Replace sensor
Improper wiring of electrode Correct wiring
Faulty bleed relay Replace relay
In boilers, flashing to steam Make sure plumbing is done according to the recommended
installation diagram
Too frequent intermittent sampling Sample less often
DI STATE CUSTOM MESSAGE
A digital input that is a DI State type can be set such that either the open or closed state generates an alarm.
The alarm message may be customized. The most common use for this will be a Flow Switch.
No flow Check piping for closed valves, blockage, etc. Check recirculation
pump.
Faulty flow switch/cable Check with ohmmeter.
Faulty controller Check by shorting digital input in controller.
TOTAL ALARM
Occurs if the flowmeter totalizer alarm limit is exceeded.
Normal operation Reset the total to clear alarm
AC coupled onto flowmeter cable Route cable at least 6 inches (150 mm) away from any AC voltage

50
Noise coupled onto flowmeter cable Shield cable
OUTPUT TIMEOUT
This error condition will stop control. It is caused by the output (either relay or analog) being activated for lon-
ger than the programmed Time Limit.
Programmed value too low for normal conditions Increase Time Limit.
Bleed flow rate too low Check for clogged strainer. Check for insufficient pressure diffe-
rential.
Bleed valve not opening Check for faulty bleed valve. Check bleed valve wiring. Check
controller relay.
Sensor not responding Clean sensor, check wiring, replace sensor
RANGE ALARM
It indicates that the conductivity signal from the sensor is out of the normal range of 0-30,000. This error
condition will stop conductivity control. This prevents controlling based upon a false conductivity reading. If
the temperature sensor goes into range alarm (outside -5 to 90 C for tower, -5 to 220 C for boiler), then the
controller will go into manual temperature compensation using the Default Temperature setting.
Sensor wires shorted Disconnect short
Faulty controller Replace or repair controller
SENSOR FAULT
This error indicates that the signal from the sensor is no longer valid at all. This error condition will stop conductivity
control.
Possible Cause Correction Action
Sensor wires shorted Disconnect short
INPUT FAILURE
This alarm indicates that the sensor input circuit is no longer working. This error condition will stop conductivity
control.
BATTERY POWER LOW
This alarm indicates that the battery which holds the date and time in memory is below 2.4 VDC.
Faulty battery Replace battery

51
SYSTEM TEMP LOW
This alarm indicates that the temperature inside the controller is below -10 °C.
Low ambient temperatures Provide heat for the controller
SYSTEM TEMP HIGH
This alarm indicates that the temperature inside the controller is above 75 °C.
High ambient temperatures Provide cooling for the controller
DISPLAY ERROR
This alarm occurs if the user interface gets lost
Pressing keys very quickly Exit out of the screen and continue programming
CONTROLLER, POWER, DISPLAY, OR SENSOR BOARD ERROR
This alarm occurs if the board listed is not recognized
Poor ribbon cable connection Remove and reseat ribbon cable, cycle power
Faulty board Return the controller for repair
CONTROLLER, POWER, SENSOR, DISPLAY, NETWORK OR ANALOG OUTPUT BOARD VARIANT
This alarm occurs if the type of board that is detected is not a valid type
Poor ribbon cable connection Reseat ribbon cable
Faulty ribbon cable Replace ribbon cable
Faulty Board Replace the board listed in the error message
INVALID CONTROL MODE
This alarm occurs if the programmed control mode is not possible for the installed power relay board
The power relay board has been removed and
replaced with an incorrect model
Reinstall the correct board or reprogram the output to a valid type
for the board installed
SENSOR, DIGITAL INPUT, RELAY OR ANALOG OUTPUT DISABLED
This alarm occurs if software for that input or output did not start correctly
The software is not functioning If the error message clears on its own, no action is required.
If the error message persists, cycle power.
If the error message still persists, return the controller for repair.
RELAY OR ANALOG OUTPUT CONTROL FAILURE
This alarm occurs if software for that output did not run correctly
The software is not functioning If the error message clears on its own, no action is required.
If the error message still persists, return the controller for repair.
FRAM FILE SYSTEM ERROR
This alarm occurs if the FRAM is not detected at power up
The FRAM was or is not functioning If the error message clears on its own, no action is required.
If the error message still persists, replace the controller board.

52
8.0 SERVICE POLICY
Walchem controllers have a 2-year warranty on electronic components and a 1-year warranty on mechanical parts and
electrodes. See Statement of Limited Warranty in front of manual for details.
Walchem controllers are supported by a worldwide network of authorized master distributors. Contact your authorized
Walchem distributor for troubleshooting support, replacement parts, and service. If a controller is not functioning
properly, circuit boards may be available for exchange after the problem has been isolated. Authorized distributors will
provide a Return Material Authorization (RMA) number for any products being returned to the factory for repair. Re-
pairs are generally completed in less than one week. Repairs that are returned to the factory by next-day-air freight will
receive priority service. Out-of-warranty repairs are charged on a time and material basis.

53
9.0 SPARE PARTS IDENTIFICATION
191617
Safety Cover
191612
Power switch cable
191660 W100 Power relay board
191661 W110 Power relay board
102903
Locknut
102834
Fuse
191678
Strain Relief/Insert
103938
191677
103803
Power switch
103859
Power cord
103860
Pigtails
191608 No BNC Spare Parts (CT-BL)
191656 Control Board, No AO
191657 Control Board with AO
191613
Ribbon Cable
Controller Parts

54
103875
Panel
102961
Hanger
102586
Nut
190998-03*
Switch assembly
3 ft. cable
190996
Float
102919
O-Ring
191020-03*
Switch/Float
Assembly
3 ft. cable
102594
O-Ring
102881
Flow Switch
Body
190997-03*
Flow Switch
Assembly
3 ft. cable
102917
Nipple
102879-01
Elbow
102387
Sample
Valve
102594
O-Ring
191646-03*
Sensor (Graphite)
or
191647-03*
Sensor (Stainless Steel)
3 ft. cable
102586
Nut
191680-03*
Manifold
Assembly
3 ft. cable
W100-CT-B Spare Parts
103885
Screw
103886
Screw
* Use‘-20’ for 20 ft. cables
WCTW Sensor Option B or F

55
W100-CT-D
103885
Screw
103886
Screw
103874
Panel
102961
Hanger
102962
Flow Switch/Tee
103056
Sample Valve
103058
Tee
103061
Conductivity
Sensor
191077-04
Manifold
102437
Nipple
104031
Reducer
WCTW Sensor Option D

W100-CT-H Spare Parts
WCNW Sensor Option E
102387
Sample
Valve
191638-03*
Electrodeless
Conductivity
sensor, CPVC
3 ft. cable
102586
Nut
102594
O-ring
191020-03*
Flow switch
assembly
3 ft. cable
190997-03*
Switch/Float
assembly
3 ft. cable
102594
O-ring
102881
Flow switch
body
102919
O-ring
190998-03*
Switch
assembly
3 ft. cable
190996
Float
191157
Tee
assembly
102377
Hanger
103535
Panel
102961
Hanger
103886
Screws
103885
Screws
191683-03*
Manifold assembly
3 ft. cable
*Use‘-20’for 20 ft. cables
WCTW Sensor Option H

Model Code
WCTW
WBLW
Relays/Wiring
100H= 3 powered relays, hardwired
100P = 3 powered relays, prewired USA power cord pigtails
100D= 3 powered relays, prewired DIN power cord, no pigtails
110H= 3 dry relays, hardwired
110P = 3 dry relays, prewired USA power cord, no pigtails
110D= 3 dry relays, prewired DIN power cord, no pigtails
Analog Output
N = No analog output
A = One isolated analog (4-20 ma) output
Sensors (WCTW)
N = No sensor
A = Inline/submersion graphite contacting conductivity
B = Graphite contacting conductivity + Flow Switch manifold on panel
C = High pressure contacting conductivity
D = High pressure contacting cond + Flow Switch manifold on panel
E = Inline/submersion 316SS contacting conductivity
F = 316SS contacting conductivity + Flow Switch manifold on panel
G = Inline/submersion electrodeless conductivity
H = Electrodeless conductivity + Flow Switch manifold on panel
Sensors (WBLW)
N = No sensor
A = Boiler sensor with ATC, 250 psi, 20 ft cable
B = Boiler sensor without ATC, 250 psi, 20 ft cable
C = Condensate sensor with ATC (cell constant 0.1), 200 psi, 10 ft cable
D = Boiler sensor with ATC, up to 100 mS/cm (cell constant 10), 250 psi, 20 ft cable
FIVE BOYNTON ROAD HOPPING BROOK PARK HOLLISTON, MA 01746 USA
TEL: 508-429-1110 Web: www.walchem.com
Relays/
Wiring
Analog
Output
Sensors
–

W100 CT-BL Series Cooling Tower and Boiler Controller Manual

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