Jerome 431 manual

SS-086, Rev D
JEROME®
431-X™
MERCURY VAPOR ANALYZER
OPERATION MANUAL
September, 2000
Arizona Instrument LLC
1912 West 4th
Street
Tempe, AZ 85281
(602)470-1414
800-528-7411
Fax(480)804-0656
http://www.azic.com

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JEROME 431-X
Mercury Vapor Analyzer
Operation Manual
PROPRIETARY RIGHTS NOTICE
This manual contains valuable information and material developed by Arizona Instrument LLC
for use with the Jerome 431-X Mercury Vapor Analyzer. No part of this manual can be
reproduced or transmitted in any form or by any means, electronic, mechanical or otherwise
without the express written permission of Arizona Instrument LLC. This includes photocopying
and recording or in connection with any information storage or retrieval system
ALL RIGHTS RESERVED
© Copyright 2000, Arizona Instrument LLC
Mallcosorb™ is a registered trademark of Mallinckrodt.
Resisorb™ is a registered trademark of J.T. Baker Chemical Company.
Tygon™ is a registered trademark of Norton.

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TABLE OF CONTENTS
FOR THOSE WHO CAN'T WAIT TO USE YOUR
JEROME 431-X BEFORE READING THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . 5
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Features of the 431-X . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PRINCIPLES OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
INSTRUMENT OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Digital Meter Display Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Daily Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Sensor Regeneration Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Sample Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Sampling Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Survey Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operating on AC Power or Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Operating on Internal Battery Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Charging Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Obtaining Maximum Battery Life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preventive Maintenance Calendar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Flow System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Internal Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Replacing Battery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
INTERNAL DIP SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Input Voltage and Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Displaying Nanograms or Milligrams/Cubic Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Changing the Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Verification of Calibration and Quality Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
431-X TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
JEROME 431-X TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Optional “Communications” Version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Instrument I/O Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Potential Interferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

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ACCESSORIES & MAINTENANCE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Accessory Kit, Y431-0901 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Functional Test Kit, Y431-0902 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Maintenance Kit, Y431-0903 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Dosimeter Analysis Kit, Y431-0905 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Available but Not Shown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
FACTORY CALIBRATION SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
APPENDIX A , 431-X FUNCTIONAL TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Mercury Transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Vessel Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Replacing Mercury . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
12.5 Syringe Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Functional Test Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
431-X Temperature Conversion Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Functional Test Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
APPENDIX B - PERSONAL MERCURY DOSIMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Dosimeter Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Before Sampling with the Dosimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Dosimeter Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Non-Standard Flow Rates and Dilution Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Dilution Module Ratio Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Most Accurate Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Loading the Dosimeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Dilution Module Ratio Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Analysis with a Dilution Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
APPENDIX C - INTERNAL DIP SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
APPENDIX D - OPTION BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Instrument Zeroing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Automatic Regeneration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
15.4 DC Power Mode Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

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FOR THOSE WHO CAN'T WAIT TO USE YOUR
JEROME 431-X BEFORE READING THIS MANUAL
CAUTION: The Jerome 431-X is intended for vapor use only. DO NOT allow the probe or
the instrument's intake to come in contact with liquids, dust or other foreign
material.
Please read the manual for added details that will optimize the results and the life of your
instrument or if your application requires use of dosimeters, special voltage inputs or data output.
Also, refer to the manual for complete details on operation, maintenance and troubleshooting.
The Jerome 431-X is easy to operate and ready for use upon receipt from the factory. Follow
these brief steps to use your instrument.
• Remove the instrument from the packing material. Check for any damage and confirm
receipt of all parts on your packing list. Contact Arizona Instrument Customer Service at
800-528-7411 or 602-470-1414 if you have any questions.
• Press the ON button. In less than one second the display should read 000. Note that a
LO BATT message appears briefly in the upper left corner. If the LO BATT light
persists, charge the battery. See page 13 for details.
• Check the voltage setting (110 or 220 VAC) on the back of the instrument. Ensure that it
is set to the correct voltage. If the voltage must be changed, turn the knob. However, it
may also be necessary to change the frequency setting; see page 18 for details.
• Perform a sensor regeneration by following these steps:
% Plug the line cord into the instrument using the plug in the back and to an AC power
outlet.
% Power the instrument ON and press the REGEN button. The instrument will begin a
10 minute regeneration cycle, indicated by .H.H.H flashing on the display. Do not
interrupt this cycle. For a complete description of this process, see page 10.
% If any error message, such as .H.L.P or .L.L.L appears on the display, see the
Troubleshooting section on page 20.
• Adjust the sensor zero by pressing the ZERO button and turning the zero adjust screw
located under the handle. Adjust until the display reads 0.
• The instrument is now ready to sample. Note that as the instrument measures mercury,
the ZERO will display H. Do not adjust the ZERO after the instrument has
measured mercury and before the next regeneration. (Occasionally the ZERO may
drop to L (for low) between the initial zeroing and the first sample. It is OK to readjust
the ZERO if the instrument has not measured mercury.)
• The instrument is designed for work space air monitoring. Press the SAMPLE button to
start a 12 second sampling cycle.
• DO NOT allow the probe or the instrument’s intake to come in contact with liquids.
• Note that the instrument is not explosion proof.
• After the day’s survey, again perform a sensor regeneration. When complete, store the
instrument with the zero air filter in the intake.
If you have any questions call AZI Customer Service, or your Technical Sales
Representative, at 1-800-528-7411 or 1-602-470-1414

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2 INTRODUCTION
The Jerome 431-X Gold Film Mercury Vapor Analyzer is designed for the easy and accurate
analysis of mercury vapor in the workplace environment and for the location of mercury spills.
The 431-X is easy to operate and has few maintenance requirements however, please take a
moment to read this manual before attempting operation.
The Jerome 431-X is an ambient air analyzer with a range of 0.001 to 0.999 milligrams per cubic
meter (mg/m3
Hg). If you have any questions about your application or operation, please call
AZI Customer Service at 800-528-7411 or 602-470-1414 for assistance.
2.1 Features of the 431-X
• Automatic sensor regeneration when equipped with the communications option and used
with the Jerome Communication Interface Software (JCI) program and the Jerome data
logger.
• Regulated film heat voltage during sensor regeneration. This allows the sensor to clean
properly with voltages from 100-130 VAC (or 200-260 VAC).
• Survey mode can be locked in.
• DIP switch setting can change the digital meter readings from mg/m3
Hg to nanograms
(ng) of Hg (see page 18).
• The Jerome 431-X can be operated from 100-130 or 200-260 VAC. To change the
default voltage range, refer to Setting the Input Voltage, page 18.

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3 PRINCIPLES OF OPERATION
Mercury is unique in its ability to alter the resistance of a gold film. The 431-X sensor consists
of two thin gold films, a reference and a sensor, configured in a Wheatstone Bridge Circuit,
which detects very small changes in electrical resistance. The reference film is sealed and not
exposed to mercury. The sensor film is exposed to mercury resulting in resistance changes,
which are measured by the circuit. A microprocessor computes the concentration and displays
the results.
Activating the SAMPLE mode starts an internal pump which draws air through a scrubber filter
and into the flow system. After 2 seconds, the sample solenoid bypass opens, closing off the
scrubber filter from the flow system. The sample air passes through a filter (removing any acidic
gases which interfere with the sensor's response to mercury) and is drawn over the gold film
sensor. The sensor adsorbs and integrates the mercury vapor. Nine seconds after starting, the
sample solenoid bypass closes and the remainder of the sample is drawn through the scrubber
filter and the flow system. The measured concentration is then displayed on the digital meter in
milligrams per cubic meter (mg/m3
) of mercury. An internal DIP switch can be used to change
the digital meter display from mg/m3
to nanograms of mercury (see page 18).
The instrument's microprocessor automatically rezeroes the digital meter at the start of each
sample cycle and retains the meter reading until the next sample cycle begins, thus eliminating
drift between samples.
During the sample cycle, bars on the digital meter represent the percentage of sensor saturation.
Approximately sixty-five samples containing 0.1 mg/m3
Hg may be taken before the sensor
reaches saturation. After absorbing approximately 500 nanograms of mercury, the sensor
becomes saturated and needs to be cleaned. This is accomplished by a manually activated 10
minute heat cycle, or sensor regeneration which burns the mercury from the sensor. This
mercury is absorbed on internal filters to prevent any external contamination. The solenoid
bypass closes during the sensor regeneration cycle, causing the air to pass through the scrubber
filter, providing clean air for the regeneration process. The flow system's final scrubber prevents
contamination to the atmosphere from the desorbed mercury.

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After a sensor regeneration, it is necessary to bring the two gold films back to a similar
resistance. The ZERO button, along with the ZERO ADJUST potentiometer, are used to reset
the sensor's reference film and sensor film to the same baseline. The sensor may exhibit some
low level thermal drift after the regeneration cycle, due to heat generated during sensor
regeneration. To ensure maximum sample accuracy, wait 30 minutes after a regeneration and
then check the ZERO adjustment. If the display reads 0 when the ZERO button is pressed, the
adjustment has been accomplished. If the display reads H or L, simply turn the ZERO ADJUST
pot with the trimmer tool or small screwdriver to complete the adjustment.
Only adjust the ZERO pot after a regeneration. It is not necessary to rezero between samples
since the instrument automatically erases the previous reading. If the ZERO ADJUST pot is
manually turned between samples, the results will be slightly lower than the actual concentration.
However, this is not a permanent problem and is corrected with a sensor regeneration.
4 INSTRUMENT OPERATION
4.1 Digital Meter Display Codes
METER DISPLAY EXPLANATION
000 Ready to sample
.000 Lack of mercury reading
00.0 Lack of mercury reading, display in nanograms (see page 18)
.8.8.8 Perform sensor regeneration (refer to page 10)
.H.H.H Sensor regeneration in progress (.H.H.H flashes)
.L.L.L Perform re-zero (refer to page 10)
.P.P.P Power cord required or low line power, <100 VAC (or 200
VAC)(see page 19, Changing the Fuse, if .P.P.P remains on after
the cord is connected.)
.H.L.P High line power, greater than 130 VAC (or 260 VAC)
.LO BAT Recharge batteries (refer to page 13)
.E.E.E Same as LO BAT, automatically shuts off
.HL High level, sample exceeded maximum sample limit (.999)
DURING SAMPLING
.- 0-25% sensor saturation
.-- 25-50% sensor saturation
.--- 50-75% sensor saturation
-.--- 75-100% sensor saturation

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DURING SAMPLING USING THE SURVEY MODE
- Survey sampling (minus sign flashes continuously)
WHEN ZERO IS
DEPRESSED
Adjust to 0 only after sensor regeneration. It is normal for the
display to read H after sampling has started.
0 Zero, ready to sample
H High, turn Zero pot counterclockwise
L Low, turn Zero pot clockwise
4.2 Daily Operations
Before each day's use of the Jerome 431-X, perform the following four steps to verify proper
instrument operation:
• Press the power ON button.
% The digital meter displays 000. (Disregard the digital
meter's initial momentary reading.) Recharge or
replace the battery pack if the LO BAT indicator
REMAINS ON. Refer to pages 13 and/or 17 for the
procedure.
% To ensure the instrument's electronics have stabilized,
allow a 1 minute warm up before beginning the next
step.
• Perform a sensor regeneration. Refer to page 10 for the
procedure. Thirty minutes after sensor regeneration is complete, rezero the instrument.
NOTE: For maximum accuracy, such as when testing with the Functional Test Kit, wait thirty
minutes after the sensor regeneration cycle to rezero the unit. For emergency
response, such as for spill cleanup, the unit can be rezeroed immediately after sensor
regeneration
• Press the SAMPLE button.
% During the sample cycle, the digital meter displays a bar (-) which indicates the
amount of sensor saturation.
• At the end of the 12 second cycle, read the digital meter.
% The number shown on the digital meter is the mercury concentration in mg/m3
. This
value remains on the display until the next sample is taken. The digital meter
automatically zeroes at the start of each sample.
• At the end of each day's use perform a sensor regeneration. DO NOT ALLOW
MERCURY CONTAMINATION TO STAY ON THE GOLD FILM SENSOR
OVERNIGHT.

10
4.3 Sensor Regeneration Instructions
A sensor regeneration is needed to clear the 431-X sensor of any accumulated mercury and to
prolong the life of the sensor. This simple procedure should be done:
• At the beginning of the day on which the instrument is to be used.
• During the mercury survey, if the sensor becomes saturated.
• At the end of the day’s survey, before storage.
• At a minium of every 30 days while the instrument is in storage. Regeneration once each
month will prolong the life of the gold film sensor.
See the Principles section on page 7 for more details on the gold film sensor and the sensor
regeneration.
AC power must be between 100-130 VAC or 200-260 VAC for the sensor to clean properly. If
AC power is not between these limits, an .P.P.P or .H.L.P may appear in the display (see page 8).
Refer to page 18 for voltage and frequency settings.
CAUTION: Once a sensor regeneration is initiated, DO NOT interrupt the cycle.
• Attach the power cord to the 431-X and plug it into AC power. AC power is required to
thermally regenerate the sensor.
• Press the REGEN button.
% The digital meter flashes .H.H.H for the duration of the 10 minute cycle and displays
.0.0.0 when the cycle is completed.
% DO NOT INTERRUPT THIS CYCLE. Wait until the cycle is completed before
continuing with the next step.
NOTE: The digital meter will read .P.P.P after REGEN is activated if the power cord is not
plugged in or if the instrument's fuse needs replacing. Plug in the power cord, or if
necessary, replace the fuse according to the procedure on page 19.
• While pressing the ZERO button, turn the ZERO ADJUST potentiometer using the
trimmer tool until the digital meter reads 0. See the illustration on page 6 for the location
of the ZERO ADJUST potentiometer.
% If the meter reads H, turn the ZERO ADJUST counter-clockwise;
% If the meter reads L, turn the ZERO ADJUST clockwise.
NOTE: A minimum 30 minute wait after the sensor regeneration cycle is complete ensures
maximum sample accuracy. However, the unit can be used immediately following
the sensor regeneration if necessary. When the sensor regeneration is complete, press
ZERO and adjust the ZERO ADJUST pot until 0 appears on the display. Install the
zero air filter in the intake and take several samples or lock the instrument into survey
mode (see page 12). After approximately one minute, stop sampling and check the
ZERO. Adjust to 0. Repeat sampling through the zero air filter until sensor remains
on 0.

11
NOTE: Depending upon internal configuration, a number between 00 and 100 may appear on
the display, instead of H, L, or O when zero is pressed. See Internal Dip Switch
Settings, page 18, for details. IMPORTANT: Do not turn the ZERO ADJUST
potentiometer between samples. Turn the ZERO ADJUST only after a sensor
regeneration cycle otherwise invalid readings will result.
• Press the power OFF button and disconnect the power cord.
• The Jerome 431-X is ready for sampling.
4.4 Sample Mode
This mode, used for standard operation, produces optimum accuracy (+/-5% at 0.100 mg/m3
Hg)
with the Jerome 431-X.
% The digital meter displays 000. If the unit is set to display in ng, the digital meter
displays 00.0. (Disregard the digital meter's initial momentary readings.) Recharge or
replace the battery pack if the LO BAT indicator REMAINS ON. Refer to pages 13
and/or 17 for the procedure.
• To ensure the instrument's electronics have stabilized, allow a 1 minute warm up before
beginning the next step.
• Press the SAMPLE button.
% During the sampling cycle, the bar (or bars) shown on the digital display indicate the
current percentage of sensor saturation. (Refer to Meter Display Codes, page 8, for
code descriptions.)
% The bar (or bars) flash after 2 seconds and again after an additional 7 seconds. This
flashing signals the opening and closing of the solenoid sample bypass. (See the
Principles of Operation on page 7 for details.)
• At the end of the 12 second cycle, read the digital meter.
% The number shown on the digital meter is the mercury concentration in mg/m3
(or ng).
This value remains displayed until the next sample is taken. The digital meter
automatically zeroes at the start of each sample.
• When the sensor is completely saturated, the digital meter displays .8.8.8 instead of a
value. No further operation is possible until a sensor regeneration is performed. (Refer to
page 10 for the Sensor Regeneration procedure.)
• Press the power OFF button when not in use. Install the zero air filter in the instrument
intake during storage.

12
4.5 Sampling Notes
• The Jerome 431-X is intended for vapor use only. DO NOT allow the probe or the
instrument's intake to come in contact with liquids, dust or other foreign material.
Moisture or liquids drawn into the instrument can damage the sensor and flow system.
• The Jerome 431-X operates a minimum of 6 hours on a fully charged battery.
• Use the probe (AZI P/N1400-2002) to locate mercury vapor in hard to reach places. Plug
the probe directly into the instrument's intake.
4.6 Survey Mode
The survey mode takes samples every 3 seconds automatically. Use this mode to locate mercury
spills or to assess areas of potentially high mercury concentrations. Sampling in the survey mode
is not as accurate. Due to the decreased sample volume, the accuracy of the instrument is
reduced to +/- 20% @ .100 mg/m3
.
% The digital meter displays 000. If the unit is set to display in ng, the digital meter
displays 00.0. (Disregard the digital meter's initial momentary readings.) Recharge or
replace the battery pack if the LO BAT indicator REMAINS ON. Refer to pages 13
and/or 17 for the procedure.
% To ensure the instrument's electronics have stabilized, allow a 1 minute warm up
before beginning the next step.
• Press and hold the SAMPLE button.
% The instrument takes a normal 12 second sample, displays the concentration at the
end of the cycle and then goes into the survey mode sampling every 3 seconds. The
display flashes the measured concentrations at the end of each 3 second sample cycle.
• When you are finished surveying, release the SAMPLE button.
% The final survey value remains displayed until the next sample is taken.
NOTE: Approximately 65 samples at .1 mg/m3
may be taken before a sensor regeneration is
required.
• To lock the instrument in a survey mode:
% Hold the SAMPLE button down until the sensor status indicator bar(s) "_" begins
flashing on the display.
% Press the ZERO button, then release the SAMPLE button.
% The pump should continue to run and the display should update every 3 seconds.
% The instrument remains in the survey mode until one of the following occurs:
' The sensor is saturated
' A LO BAT (low battery) signal is encountered
' An HL (high mercury level) is encountered
' The instrument is turned OFF.
• Press the power OFF button when not in use.

13
4.7 Operating on AC Power or Generator
For stationary use, the 431-X may be operated on AC power. Operating the instrument only on
AC power eliminates the need for the battery pack and its necessary maintenance. If preferred,
the battery may be unplugged or removed completely.
When using a generator to power the Jerome 431-X, it is important that the generator is capable
of maintaining a constant voltage output. This is especially true during the sensor
regeneration. Use a high quality line conditioner or voltage regulator to prevent damage to the
electronic components and the sensitive gold film sensor.
4.8 Operating on Internal Battery Power
Battery power allows use of the Jerome 431-X as a portable instrument. If battery power is
necessary for use, please be aware of the following:
• A fully charged battery pack (AZI P/N Z4000-0907) provides power for a minimum of 6
hours of operation.
• For operating more than 6 hours, an extra fully charged battery pack is needed.
• Complete battery recharging takes 14 hours. Refer to page 13, Charging Batteries for
instructions if needed.
• The 431-X use a rechargeable NiCad battery. Dispose of the old battery properly when it
is replaced with a new one.
• External battery power: A special version of the Jerome 431-X is available that can be
operated from a secondary DC source, such as a battery used in conjunction with solar
panels. Contact AZI for additional information.
4.9 Charging Batteries
• Press the power OFF button.
• Attach the power cord to the 431-X and plug it into AC power.
• Complete battery recharging takes 14 hours.
• The 431-X contains a trickle charger so it may be continually plugged into an AC power
source without damaging the battery pack.
NOTE: To charge the batteries outside of the instrument, use the IDC Battery Charger (AZI
P/N 4000-1011, for 115 VAC, P/N 4000-1012, for 230 VAC).

14
4.10 Obtaining Maximum Battery Life
There are certain inherent limitations to NiCad (Nickel Cadmium) batteries. The primary
limitation is a memory effect that occurs when the batteries are partially discharged and then
recharged, repeatedly. This memory leads to a drastic reduction in the usable battery life. To
prevent this memory effect, periodically allow the battery pack to discharge completely, then
recharge the battery pack.
• For maximum battery life, follow these 3 steps:
% At least once a month wait until LO BAT appears on the digital meter before
recharging the battery pack.
% Charge the battery pack when the LO BAT indicator comes on. Excessive discharge
can damage the battery pack. Before storing the instrument verify the power is OFF.
• When batteries fail to hold a charge, the battery pack should be replaced. Battery life
under normal usage is approximately 1 year, depending on the number of charge and
discharge cycles.
5 MAINTENANCE
5.1 Preventive Maintenance Calendar
To keep the Jerome 431-X operating at peak performance, follow the maintenance schedule
below. Use this schedule as a guideline only, as maintenance is more a function of application
and amount of use, rather than time.
ALWAYS install the zero air filter into the instrument's intake during storage.
PART/COMPONENT MAINTENANCE CYCLE PAGE
Charge batteries
At least once per month, after one month's
storage, or when LO BAT appears
13
Change .25mm fritware Weekly or as needed 15
Change internal filters* After 6 months of use or as needed. 16
Replace zero air filter* Annually 16
Factory calibration Annually 19
Calibration check Monthly or as needed 29
Replace batteries
Annually or as needed
The battery pack contains NiCad batteries.
Dispose of them properly.
17
* C/M filters contain Mallcosorb™, Scrubber filters and zero air filters contain Resisorb™.
For safety information, see the supplier’s Material Safety Data Sheets (MSDS) or call AZI
Customer Service at 1-800-528-7411 or 1-602-470-1414 for assistance in obtaining the
MSDS. Dispose of all filters properly.

15
Figure 4 Remove Intake
Figure 5 Insert
Fritware
Figure 6
Remove
Fritware
5.2 Flow System
The Jerome 431-X's flow system is the crucial link between the sensor and the sample. For the
instrument to perform correctly, the flow system must be properly maintained. The user
maintainable components of this system are the intake filter (.25 mm fritware), a C/M filter, two
scrubber filters and connecting tubing.
Check the Preventive Maintenance Calendar, page 14, for a suggested schedule for changing
filter disc and filters. The Tygon™ tubing in the system must be free of crimps for proper flow.
• Replace the .25mm Fritware once each week. In
dusty environments, the fritware may need
replacement as often as once a day. Replacement
.25mm Fritware are available from AZI, Technical
Sales, 1-800-528-7411 or 1-602-470-1414, (see
Accessories & Maintenance Parts on page 25).
% Unscrew and remove the intake from the
instrument.
% Push the old fritware disc out using your trimmer
tool.
% Use tweezers to insert the new fritware. Avoid
touching the new fritware disc with fingers.
% Use the blunt end of the trimmer tool to seat the
fritware disc firmly against the inner ledge of the
intake.
% Screw the intake back on the instrument.
CAUTION
The air flow intake, on the front of the instrument, must be securely held in place. If it is loose,
the tubing inside the instrument can become twisted when the intake housing is replaced. On
older instruments, it may be necessary to open the instrument and tighten the retaining nuts from
the inside. Call AZI Customer Service at 1-800-528-7411 or 1-602-470-1414 if you have any
questions.

16
5.3 Internal Filters
Replace the internal filters system (one C/M filter and two scrubber filters) after six (6) months
of use, or as needed. (See Troubleshooting section, page 20.)
• Press the power OFF button and unplug the power cord.
• Remove the 2 side screws from the intake end of the instrument and open the case.
• Carefully disconnect the Tygon™ tubing from both ends of the filters and discard the old
filters.
CAUTION:
The Series C/M filter contains Mallcosorb™ and the Scrubber Filters contain Resisorb™.
Both types contain trace amounts of mercury. For safety information, see the supplier’s Material
Safety Data Sheets (MSDS) or call AZI Customer Service at 1-800-528-7411 or 1-602-470-1414
for assistance in obtaining the MSDS. Use proper disposal methods for all filters.
• Connect the new filters to the Tygon™ tubing, ensuring all filter straight nipples point
toward the intake and elbows point according to the illustration.
% Push the Tygon™ as far as it will go onto the filter fittings.
• Push the filters into the mounting clips.
• Remove any crimps in the tubing and ensure that tubing connections are secure.
• Close the case and replace the screws.
• Dispose of all filters in accordance with State and Federal EPA Regulations.

17
5.4 Replacing Battery Pack
• Press the power OFF button.
• Unplug the power cord.
• Remove the screws, one on each side, from the
intake end of the instrument and open the case lid.
• Disconnect the battery connector from the board.
• Loosen the two (2) captive screws holding the
battery bracket and remove the bracket.
• Remove the old battery pack and replace it with a
new battery pack.
• Replace the battery bracket and tighten the captive
screws.
• Connect the new battery connector to the board.
• Close the case and replace the screws.
• Dispose of the old NiCad battery properly, in
accordance with State and Federal EPA
Regulations.

18
6 INTERNAL DIP SWITCH SETTINGS
6.1 Input Voltage and Frequency
This instrument has been factory set and calibrated to use the input power setting, either 110
VAC, 60 Hz, or 220 VAC, 50 Hz, requested when the instrument was ordered. The settings are
easily changed using the switch in the Power Inlet Module for voltage and the internal DIP
switch setting for frequency.
• Ensure the instrument is turned OFF
and unplugged.
• Locate the power receptacle on the
rear of the instrument.
• Insert a small screwdriver in the
voltage selection slot and turn the
selector until the arrow points
toward your setting choice and a
click is heard.
• Turn the instrument off.
• Remove the two screws near the
front of the instrument and open the
lid.
• Locate DIP Switch SW2 at the top of
the main circuit board. See figure at
right.
• Set DIP Switch SW2 position #1 and
#6 as follows.
60Hz 50Hz
Position #1 OFF OFF
Position #6 OFF ON
6.2 Displaying Nanograms or Milligrams/Cubic Meter
The instrument is factory set to display mg/m3
(milligrams per cubic meter) Hg (.XXX). For
some applications, including dosimeter analysis, the instrument’s display can be converted to
display nanograms.
• Turn the instrument off. Remove the two screws near the front of the instrument and
open the lid.
• Locate DIP Switch SW2 at the top of the main circuit board. See figure above.
• Place position #2 to OFF for Nanogram display.
• Return position #2 to ON for Milligram display.

19
6.3 Changing the Fuse
If the instrument display reads .P.P.P when the instrument is connected to AC power or when
REGEN is pressed, or if the battery will not charge, the fuse may need to be replaced. The AC
line power could also be less than 100 VAC (220 VAC). Check the fuse with an ohm meter
and/or the AC line power with a voltage meter.
• Locate the power receptacle on the rear of
the instrument.
• Insert a small screwdriver in the slot and
gently slide the fuse compartment out.
• Check the fuse held in the open sided clip
and if it is bad, replace it with the spare
fuse held in the sliding spare fuse
compartment. Discard the bad fuse.
% When it is convenient, replace the spare
fuse with another 1A 250V Fast-Blo
fuse (AZI P/N 5100-1012).
• Replace the fuse compartment in the power
receptacle.
7 CALIBRATION
The Jerome 431-X's gold film sensor is inherently stable and does not require frequent
calibration. The interval between calibrations depends upon the application and frequency of
use; however, the recommended minimum or maximum interval is every 12 months.
The Jerome 431-X has been factory calibrated using NIST traceable permeation tubes. In order
to calibrate the Jerome 431-X, a sophisticated calibration system is required that ensures stability
of the calibration gas source, eliminates any pressure in the calibration gas stream and controls
the temperature of the calibration environment. Calibration also requires special proprietary
software. This system has an estimated uncertainty of ±3.5%.
We strongly recommend you take advantage of our calibration and maintenance service at
Arizona Instrument. A certificate of calibration is issued by Arizona Instrument when your
instrument is factory calibrated to 0.100 mg/m3
. Two additional calibration points, 0.010 and
0.025 mg/m3
, are available upon request at additional charge. Contact Arizona Instrument
Customer Service at 1-800-528-7411 or 1-602-470-1414 for assistance in obtaining calibration.
7.1 Verification of Calibration and Quality Control
The Functional Test Kit, AZI P/N 4431-0902, is used to determine if your instrument is within
calibration tolerances between recommended annual factory calibrations. If your application
requires frequent verification of instrument function, this test demonstrates the unit’s operation,
calibration, and function. This test verifies proper instrument operation through the introduction
of a known mass of mercury into the Jerome analyzer and allows you to have complete
confidence in the sample results.

20
Recording the Functional Test Kit results in an instrument log provides a quality control/quality
assurance record of instrument function between regular calibrations. As long as the test results
fall within the expected range, you may assume the instrument is functioning correctly.
THIS FUNCTIONAL TEST DOES NOT CALIBRATE THE INSTRUMENT.
A complete description of the Functional Test Kit procedures is contained in Appendix A,
beginning on page 29.
To order the kit, contact Arizona Instrument Technical Sales at 1-800-390-1414 or 1-602-470-
1414.
8 431-X TROUBLESHOOTING
Symptom Possible Cause Solution
Power Problems
Unit does not turn ON. LCD
displays 000 when connected to
power cord and ON button is
pressed.
Dead battery Recharge battery (minimum 14
hours) refer to page 13.
Replace battery, refer to page 17.
Unit does not turn on when
connected to AC power cord.
Fuse
Insufficient power
Replace fuse, refer to page 19 .
Be sure there is power to the AC
outlet using a volt meter.
Regeneration & zero problems
LCD displays .8.8.8. Sensor saturated Do not attempt to rezero. Unit
must be regenerated. See page 10
for information.
LCD displays .L.L.L when
taking first sample.
Changes in
temperature
Readjust zero pot. See page 6 for
information .
LCD displays H at finish of
sensor regeneration
Internal
contamination may
redeposit mercury
from flow system
onto gold film
sensor.
Remove and replace intake filter
disk, Tygon™ tubing and internal
C/M filter. Check tubing for kinks
or crimps. Repeat regeneration
cycle. See page 10 for information.
Zero adjust pot cannot be
adjusted to 0
Pot not turned
sufficiently
Turn zero adjust up to 20 times to
reach the end. Pot will “click”
softly.
Display still unchanged Sensor may be
ruptured or pot may
be broken
Turn pot slowly in opposite
direction till display reads 0. If still
unchanged, call AZI Customer
Service.

Symptom Possible Cause Solution
21
Sampling Problems
Air flow is restricted during the
sensor regeneration cycle,
causing possible permanent
damage.
Kinks and crimps in
the Tygon™ tubing.
Periodically check the Tygon™
tubing inside the instrument.
High erratic results Internal mercury
contamination
1. Install zero air filter in intake and
tighten intake nut. Press SAMPLE
button. After 3 samples, if readings
are over .003 mg/m3
, replace intake
filters and Tygon tubing.
2. Perform a REGEN with zero air
filter in intake. See page 10 for
information. Retest if necessary.
Replace intake filters and Tygon™
tubing.
High/erratic results
Readings vary more than 0.05
when in survey mode.
Film connection Press and hold SAMPLE button for
12 seconds in clean area or with
zero air filter in intake. Move unit
from side to side, or up and down
during sample cycle. Call AZI
Customer Service.
Low response or erratic readings
after a long period of non-use
May need a second
regeneration cycle.
Wait 20 minutes between
regeneration cycles. Test with
FTK. See page 29 for information.
If still unresponsive, call AZI
Customer Service.
False readings, may go to .8.8.8
or .L.L.L
Extremely cold or
extremely warm air
sampled into unit
If sampling under these conditions,
install zero air filter in intake.
Sample until display reads .003
mg/m3
or less. This equilibrates
sensor temperature with the
temperature of the sample air
stream. Remove filter and take
samples.
High/erratic results Intake and internal
filters may get
clogged and need
replacement when
sampling in a dusty
area
Open instrument to check for
pinched, crimped or disconnected
internal tubing. In extreme
conditions a particle filter may be
installed on intake.

22
9 JEROME 431-X TECHNICAL SPECIFICATIONS
Range 0.001 to 0.999 mg/m3
Sensitivity 0.003 mg/m3
Hg
Precision 5% relative standard deviation @ 0.100 mg/m3
Hg
Accuracy +/- 5% @ 0.100 mg/m3
Hg
Response time-sample mode 12 seconds
Response time-survey mode 3 seconds
Flow rate 750cc/min (0.75 liters/min)
Power requirements 100-130 VAC or 200-260 VAC, 50 Hz or 60 Hz,
115 watts maximum
Batteries Rechargeable Nickel Cadmium
Fuse 1A 250V 5 X 20 Fast Blo
Construction Aluminum alloy
Dimensions 15 cm x 33 cm x 10 cm (6" w x 13" l x 4" h)
Weight 3.18 kilos (7 pounds)
Digital meter Liquid crystal display (LCD)
Operating environment 0° - 40°C, non-condensing, non-explosive
9.1 Optional “Communications” Version
Alarm output 30V DC, 100mA
Dosimeter power output For dosimeter analysis
Data output 1. Digital, Serial, RS232, Baud Rate 1200 for use with
Data Logger, Base Station, and/or JCI program
software
2. Digital, Serial, RS232, data format, but with driver for
20mA capability and 0 & 20mA logic levels; Baud
Rate 1200 (special industrial applications)
"OPTION BOARD"
Data output 0 - 2V or 4 - 20 mA
Auto sample interval 5, 15, 30, 60 minutes
Auto regeneration
interval
6, 24 or 72 hours

23
9.2 Instrument I/O Interface
The 431-X I/0 port (25 pin D-sub) has six functions:
• Serial communication channel, RS-232
Pin 1 Protective ground % Interface type RS-232C full
duplex, DCE
% Communication parameters -
1200 Baud, 1 start bit, 8 data
bits, 2 stop bits, no parity
Pin 2 Data in
Pin 3 Data out
Pin 7 Data ground
• Serial communication channel, 20mA current loop
Pin 1 Protective ground % Interface type: 20mA
current loop, full duplex
% Communication parameters
- 1200 Baud, 1 start bit, 8
data bits, 2 stop bits, no
parity
Pin 4 Data out (+)
Pin 5 Data in (+)
Pin 14 Data out (-)
Pin 16 Data in (-)
• Alarm output
Pin 9 Switched battery+ % Maximum voltage, 30 VDC
% Maximum current 100mAmpPin 10 Alarm output (open
collector, active low)
Pin 7 Battery ground
• Dosimeter power
Pin 22 Dosimeter enable % Voltage, 24 - 28 volts AC
% Connecting pin 22 to 23
enables the dosimeter
desorption cycle.
Pin 12 & 24 Tied together Dosimeter power
Pin 13 & 25 Tied together Dosimeter power
• Switched battery connection for data logger
Pin 9 Battery +
• Unswitched battery connection for external battery pack pin assignments
Pin 15 Battery +
NOTE: Pins 6, 8, 11, 17, 18, 20
and 21 should not be connected.
Pin 19 Battery +

24
9.3 Potential Interferences
Potential interferences to the Jerome mercury vapor analyzers are rare and most of these can be
eliminated with proper maintenance procedures. However, erroneously high readings can
sometimes occur. Here are a few things to be aware of when using the instruments.
The gold film sensors used in the Jerome mercury vapor analyzers do not respond to the
following compounds:
• Hydrocarbons
• CO, CO2, and SO2
• Water vapor (Note that water vapor condensation on the gold film can cause irreparable
harm to the sensor and must be avoided.)
The acidic gas filter, contained in the internal filter system, removes the following compounds
that cause the gold film sensor to respond:
• Chlorine
• NO2
• Hydrogen Sulfide (H2S)
• Most mercaptans (organic sulfur compounds or “thiols”)
In areas containing these highly volatile compounds, the filter can become quickly saturated. In
such situations, it is recommended that these gases be allowed to dissipate before sampling for
the less volatile, more persistent mercury vapor. A special filter designed to remove chlorine gas
is available from Arizona Instrument and may be ordered as Chlorine Filter, AZI P/N
Z2600-3940. Collection of air samples with Jerome gold coil dosimeters for analysis by the
Jerome mercury vapor analyzers will also eliminate interferences.
Ammonia in very high concentrations can cause an offgassing of accumulated acidic fumes from
the internal acidic gas filter, resulting in positive readings on the instrument. In these cases, the
ammonia odors are very strong. Again, either allow the vapors to dissipate or use the dosimeters.
Filter replacement at regular intervals, or when unexpectedly high readings are encountered in
areas of these potential interferents, may resolve these problems.
Volatile mercury compounds in general will cause the gold film to respond. Alkyl organic
mercuries such as methyl mercury (and other “straight chained” compounds) are typically
extremely volatile and change the electrical resistance of the gold film sensor. Any such
responses should be considered “qualitative,” not quantitative. The instruments are designed and
calibrated to elemental mercury vapor only.
Inorganic mercury salts such as mercuric chloride are not very volatile. They may, however,
generate some minute level of elemental mercury vapor to which the instruments will respond.
This response, again, should be considered a qualitative response only.

25
Figure 12 Probe, 1400-2002
Figure 13 Fritware,
.25", 2600-3039
Figure 14 Trimmer Tool, 2300-0001
Figure 15 Tubing
Adaptor, 1400-3010
Figure 16, 115 VAC Line Cord,
6000-4003
Figure 17 Calibration
Vessel, Thermos, 2600-
0030
Figure 18 Stopper Assembly, A2600-0902
Figure 19
Mercury Vial,
A2600-0904
Figure 20
Septa (20), 3200-
0011
Figure 23
Syringe Needles,
22 Ga. Reusable,
2600-0022
Figure 21 Septum Holder,
Z2600-3914
Figure 22 Syringe Assembly, A2600-0903
10 ACCESSORIES & MAINTENANCE PARTS
Accessory Kit, Y431-0901
This Manual, SS-086
Functional Test Kit, Y431-0902

26
Figure 24 021 Battery Pack,
Z4000-0907
Figure 25
Tygon Tubing, 1/8",
2500-3001
Figure 26 Fritware, .25
Dia. 2600-3039
Figure 27 C/M Filter, Z2600-3928
Figure 28 Zero Air Filter,
Z2600-3905
Figure 29 Scrubber Filter,
Z2600-3930
Figure 30 Personal Mercury
Dosimeter,
X4321-0901
Figure 31 Dosimeter Pump, 2600-2011
Figure 32 Dosimeter
Pump DC Supply
4000-1023 - 115VAC
4000-1024 - 230 Euro
Figure 33 Reducer,
1/8" X 3/16"
1300-0031Figure 34 Dosimeter Lead Set,
2100-6017
Figure 35 Tygon Tubing,
3/16", 1', 2500-3010
Figure 36 Zero Air Filter,
Z2600-3905 Figure 37 Tygon Tubing,
1/8", 2', 2500-3001
Maintenance Kit, Y431-0903
Dosimeter Analysis Kit, Y431-0905

27
Figure 38 Field Carrying Case, Y1400-0052
Figure 39
10:1 Dilution Module, Z2600-
3911
Figure 40
115 VAC Battery Charger,
4000-1011
Figure 41
230 VAC Battery Charger, 4000-
1012
Figure 42
Fuse, 1 Amp,
250V,
5100-1012
Figure 43 Line Cord, 220
VAC, British,
200-0003
Figure 44 Line Cord,
220 VAC, Continental Europe,
200-0008
Figure 45
Tube Nut
PS-151
Figure 46 Intake Nozzle, 1400-
3009
Figure 47 Chlorine Filter, Z2600-3940
Accessories
In addition to the parts listed in kits, which may be ordered individually, the following
accessories and replacement parts are available.
The custom designed Field Carrying Case
holds the Jerome 431-X, Personal
Mercury Dosimeters, Filters, Tygon
Tubing, Probe, and Power Cord in foam
padded safety. Openings allow full use of
the instrument without removing it from
the case.

28
Available but Not Shown
Y411-0904 031/411 Carrying Case Assembly, Holds the Jerome 431-X, Personal
Mercury Dosimeters, and Accessories in foam padded safety
Y031-0902 DC Power Kit - available on special order
For current prices and delivery information, call AZI Jerome Sales at 602-280-1414 or
800-528-7411.
11 FACTORY CALIBRATION SERVICE
Service includes filter replacement, component check and calibration and instrument calibration
to NIST traceable standards. A certificate of calibration is issued by Arizona Instrument when
your instrument is factory calibrated to 0.100 mg/m3
. Two additional calibration points, 0.010
and 0.025 mg/m3
, are available upon request at addition charge.
Loaner instruments are available upon request. For pricing, availability, and scheduling, call AZI
Customer Service at 800-528-7411 or 602-470-1414. You may use e-mail at support@azic.com

29
12 APPENDIX A , 431-X FUNCTIONAL TEST
If your application requires frequent verification of instrument functionality, this test will benefit
you. If the test results fall within the expected range, you may assume the instrument is
functioning properly. This test does not calibrate the instrument.
NOTE: Perform the functional test ONLY after a sensor regeneration.
The 431-X Functional Test Kit contains all accessories necessary to perform the functional test.
See the complete list on page 25 and verify that all the parts to the kit are present.
CAUTION:
The vial and thermometer contain liquid mercury and are possible sources of mercury
contamination. Follow the instructions for handling or transferring the mercury into the
Functional Test Kit Vessel carefully.
For safety information, see the supplier’s Material Safety Data Sheets (MSDS) or call AZI
Customer Service at 1-800-528-7411 or 1-602-470-1414 for assistance in obtaining the
MSDS.
12.1 Preparation
• Carefully unpack and inspect the parts of the kit.
• ENSURE that the mercury shipping container and mercury filled thermometer are not
broken.
• In a ventilated area, preferably under a fume hood, remove the mercury vial from its
shipping container.
• Place the functional test kit vessel and the mercury vial close to each other and open the
mercury vial.
CAUTION:
The edge between the plastic case and the glass inner vessel of the functional test kit vessel
are not sealed enough to prevent mercury from entering the area between the inner and
outer vessels. ENSURE the mercury, handled in the next step, does not come in contact
with the seal where the glass and plastic portions join.
NOTE: The vessel may be disassembled to transfer the mercury and better prevent
contamination of the outer portion of the vessel. Instructions to disassemble the
vessel can be found on page 30.

30
12.2 Mercury Transfer
• CAREFULLY pour the mercury into the center of the functional test kits vessel’s
opening.
% ENSURE that no mercury residue is on the outside of the vessel. See the supplier’s
Material Safety Data Sheets (MSDS) or call AZI Customer Service at 1-800-528-
7411 or 1-602-470-1414 for for clean-up instructions.
• INSTALL the stopper assembly into the functional test kit vessel carefully, to prevent
breakage of the thermometer.
% PRESS the stopper assembly into the vessel to achieve a good seal.
• USE the 431-X instrument to verify that the outside of the vessel is not contaminated and
the mercury vapor emission level, if any, is below the OSHA TLV for mercury.
• ALLOW the kit to adjust to room temperature for at least two (2) hours before using.
% The temperature range for the test is 18-22°C. Avoid temperature fluctuations.
CAUTION:
Do not use the calibration vessel as a portable container. If the calibration vessel is upset or
greatly agitated, mercury droplets will cling to the thermometer stem, the rubber stopper, the
mouth of the calibration vessel and the needle guide.
12.3 Vessel Disassembly
CAUTION:
The inner portion of the vessel is made of glass. Handle the vessel carefully to prevent breakage.
• LOOSEN, BUT DO NOT REMOVE the base of the vessel. The base unscrews from the
body.
• SET the vessel on a firm surface.
• HOLD the base stationary and unscrew the body from the base.
• HOLD the base and the inner glass vessel with one hand while removing the body and
gasket with the other hand.
• After the mercury is transferred into the glass inner vessel, reassemble in the reverse
order.

31
12.4 Replacing Mercury
An oxide coating will form on the drop of mercury and will cause lower readings in your testing.
Gently swirl the vessel to disturb the outer oxidized surface of the droplet. If this does not
restore higher readings, it may be necessary to replace the mercury.
• Carefully remove the stopper assembly from the calibration vessel.
CAUTION:
BE SURE NEEDLE GUIDE IS FREE OF LIQUID MERCURY.
• Carefully pour the mercury into a disposal vessel. Refer to Vessel Disassembly
Instructions on page 30.
% Mercury can become trapped between the plastic calibration vessel and the glass
inner-liner.
• Replace the oxidized mercury with approximately ½ cc fresh mercury. (AZI P/N A2600-
0904)
% Do NOT use the syringe for measuring liquid mercury. Dispose of oxidized mercury
properly.
• Reassemble the calibration vessel.
• Reinstall the stopper assembly.

32
Figure 48 Check Calibration
Figure 49 Insert into Bottle
Figure 50 Hold plunger
against Bar-Stop
12.5 Syringe Technique
• Pull and hold the syringe plunger
against the bar-stop.
• Verify that the black mark on the
syringe plunger aligns with the 1cc
mark on the syringe barrel.
% If it does not, the holder
assembly must be adjusted. Call
AZI customer service at 602-281-1745 or 800-528-7411 for assistance.
• Insert the needle into the needle-guide of the bottle
stopper.
• Operate the plunger two or three times to pump mercury
vapor into the syringe. On the final stroke, pull and hold
the plunger against the bar-stop.
• Holding the plunger against the bar-stop, remove the
syringe from the bottle and move it to the septum attached
to the instrument intake.

33
Figure 51 Insert needle into
septum
Figure 52 Gravity pulls
plunger down
Figure 53 Remove
Needle from septum
• Continue to hold the plunger against the bar-stop and
insert the syringe needle into the septum.
• Press “SAMPLE” on the instrument.
• When the display flashes, release the plunger and allow gravity to
feed the mercury vapor into the airstream. If the plunger stops,
gently press it completely closed.
• Remove the syringe needle from the septum.
12.6 Functional Test Procedure
NOTE: Perform the functional test ONLY after a sensor regeneration.
• Allow the calibration vessel to remain stable at room temperature for at least 2 hours.
% The temperature range for the test is 18° - 22°C.
% Temperature fluctuations during the test procedure will produce erratic results.
• Replace the .25mm fritware.
% Refer to page 15 for instructions.
• Replace the septum on the septum holder assembly.

34
• Plug the tubing adapter end of the septum assembly into the instrument's intake and
tighten the intake tube nut.
NOTE: To check for a tight seal, gently pull on the septum holder assembly. If it comes out
of the intake, it may be necessary to remove the intake tube from the instrument and
firmly press the tubing adapter through the intake. Tighten the intake tube firmly to
the intake stem.
• Attach a zero air filter to the septum assembly.
• Press power ON.
• Take 3 samples.
% If the average meter reading is greater than .005, stop here. The instrument may be
contaminated. See the Troubleshooting section, page 20.
% If the average meter reading is less than .005, continue to the next step.
• Note the temperature of the calibration vessel.
• Press the SAMPLE button, wait 2 seconds and when the display flashes, inject 1 cc of
mercury vapor according to the syringe technique described on page 32. Be sure all
mercury vapor has been injected before the solenoid closes (second click and display
flash).
CAUTION:
Carefully follow these instructions to minimize error.
• Record the meter reading.
• Repeat the instructions for mercury injection three more times.
% The readings obtained for the last three 1cc injections should be within +/- 5% of each
other.
• Refer to the Temperature Conversion Chart, page 35, for the acceptable range.
% The average of the last three readings should fall within the range shown on the chart.
If the average is within range, the JEROME 431-X is functioning properly.
• If the last three readings are not within +/-5% of each other,
% Perform a sensor regeneration. Press ZERO and turn the ZERO ADJUST (refer to
page 10 in the 431-X manual for the complete sensor regeneration procedure).
% Wait 1 hour before proceeding to the next step.
% Repeat the mercury injection test procedure.
% If the average of the last three readings is still not within range, refer to page 35
Functional Test Troubleshooting.

35
431-X Temperature Conversion Chart
Temperature
in °C
Digital Meter Response
16 .091 to .123
17 .100 to .135
18 .108 to .146
19 .118 to .159
20 .129 to .174
21 .138 to .187
22 .151 to .204
23 .164 to .222
24 .177 to .240
12.7 Functional Test Troubleshooting
If you don’t achieve good results with the functional test procedure, check the following:
Results Solution
Too low Be sure to inject the Hg vapor ONLY after the display flashes
(approximately 2 seconds after SAMPLE is pressed).
Typically too high Ensure the calibration vessel temperature is stable.
Too low Ensure there is no oxidation on the mercury drop in the calibration
vessel. Gently swirl the mercury drop in the calibration vessel.
Replace if necessary.
Too low Ensure the instrument’s intake is not blocked with foreign matter.
Check flow with a flow meter.
Too low Ensure syringe is calibrated to 1cc. Use a new syringe needle.
Straighten or replace crimped or blocked internal tubing.
If you find the above does not solve your problem, please call AZI Customer Service at
800-528-7411 or 602-470-1414.

36
13 APPENDIX B - PERSONAL MERCURY DOSIMETER
The gold coil personal mercury dosimeter is a unique collection device for mercury vapor. The
Jerome 431-X Gold Film Mercury Vapor Analyzer and the Personal Mercury Dosimeter
determine personal exposure levels and ambient air concentrations, as well as low levels of
mercury in natural and stack gases
For personal sample collection, the dosimeter is worn as close to the wearer's breathing zone as
possible and is connected by tubing to a pump usually worn on a belt. The dosimeter can also be
used for multiple point area monitoring by placing a dosimeter, with pump attached, in various
strategic locations.
We recommend a pump flow rate of 2 cc/minute for the most accurate results when sampling in
an atmosphere that for eight hours may contain an average of .5 mg/m3
Hg. If you are
considering using any other flow rate, see page 40, Nonstandard Flow Rates.
After sample collection is completed, the dosimeter is inserted in the Jerome 431-X's intake. A
dosimeter lead set is connected between the dosimeter and the DB-25 connector on the back of
specially equipped instruments. The instrument supplies power to volatilize the accumulated
mercury from the dosimeter to the gold film sensor. The Jerome 431-X determines the mass of
mercury collected by the dosimeter in a 17 second analysis. The dosimeter is ready for
immediate re-use after a mercury measurement has been performed.
13.1 Dosimeter Technical Specifications*
Sensitivity < 0.5 x 10-9
g Hg
Precision 15% RSD @ 0.100 mg/m3
Hg
Accuracy 15% @ 0.100 mg/m3
Hg
Recommended flow rate 2 cc/min (0.002 liters/min) for
atmospheres of 0.5 mg/m3
60 cc/min for 100% collecting
efficiency in atmospheres with
lower concentrations
Construction Nylon/Glass
Weight 1.5 ounces
Dimensions 0.5" dia. x 4.5" l
Capacity 1000 X 10-9
g Hg
Analysis Time < 2 min
*Based on 2 cc/min flow rate

37
13.2 Before Sampling with the Dosimeter
The personal mercury dosimeter adsorbs mercury vapor over a period of time. Therefore, before
each day's use it is necessary to ensure the dosimeter is mercury free. Perform the following
steps to remove any accumulated mercury.
• Connect the system as shown.
% Insert the dosimeter's large end in the 431-X's intake and gently tighten the intake tube
nut to ensure an airtight seal.
% Connect the Dosimeter Lead Set clips as shown, Short red lead to the rear and long
black lead to the far end.
heat the dosimeter.
• Attach the Dosimeter Lead Set 25 pin connector to the respective 25 pin communications
port.
• Press the instrument’s power ON button.
• Press the instrument’s SAMPLE button.
% The digital meter reading will appear in 15 seconds.
• Wait 60 seconds and press the SAMPLE button again.
% The digital meter should display less than 0.005, verifying all mercury has been
removed from the dosimeter coil.
• The dosimeter is ready for sample collection.
NOTE: For best results, dosimeter analysis should be performed immediately after collection.
If analysis cannot take place immediately, place the red end caps on the dosimeter.
For accurate results, perform dosimeter analysis no later than five days after sampling.

38
13.3 Dosimeter Analysis
NOTE: Wait a minimum of 30 minutes after a sensor regeneration before continuing.
• Connect the system as shown.
% Insert the dosimeter's large end in the 431-X's intake and gently tighten the intake tube
nut to ensure an airtight seal.
% Connect the Dosimeter Lead Set clips as shown, Short red lead to the rear and long
black lead to the far end.
heat the dosimeter.
• Attach the Dosimeter Lead Set 25 pin connector to the respective 25 pin communications
port.
• Press the instrument’s power ON button
• Reading the dosimeter (dosimeter desorption)
% Press the SAMPLE button.
' The digital meter reading appears in 15 seconds.
% Record the digital meter reading (include the decimal point).
% Wait 30 seconds.
% Press SAMPLE again and record this digital meter reading. Repeating the
heating/reading process ensures complete release of mercury from the dosimeter coil.
• Add the two digital meter readings together. The sum of the two digital meter readings is
the figure you will use in your calculations and is referred to as the meter response (MR).
NOTE: A third dosimeter desorption (pressing the SAMPLE button) should give a reading of
.005 mg/m3
or less.

39
52.5 ng
960 cc
= 0.055 ng / cc of Hg = 0.055 mg / m of Hg3
• Perform the following calculation to obtain the mercury concentration in mg/m3
based on
a time weighted average; or alternately, DIP switch #2 can be set to OFF and the
digital meter will display nanograms Hg directly (refer to diagram, page 18).
Working Formula and Units of Measure
Meter sponse X Conversion Factor
Pump Flow Rate X Sampling Time
Sample Concentration
Re
=
Where:
Meter Response = Total of the two digital meter readings in mg/m3
Conversion Factor = 87.5 ng/mg/m3
(a constant which changes the meter response to
nanograms of Hg)
Pump flow rate = 2.0cc per minute (calibrated value of the supplied Sipin Pump)
Sampling time = Duration of the sample in minutes
Sample
concentration
= In ng/cc mg/m3
EXAMPLE: To calculate a time weighted average during an 8 hour period:
Meter response = 0.600 mg/m3
(sum of the two meter response readings)
Conversion factor = 87.5 ng/mg/m3
(constant)
Pump flow rate = 2 cc/min
Sampling time = 8 hours (480 min)
% Convert the meter response (the total of the two digital meter readings) to
nanograms of mercury.
' 0.600 x 87.5 = 52.5 nanograms of Hg
% Determine the total volume of air sampled.
' 2 cc/min x 60 min/hr x 8 hr = 960 cc
% Determine the Hg concentration (time weighted average) of the dosimeter.
• Check the sensor status after each dosimeter analysis.
IMPORTANT:
Perform a sensor regeneration as soon as the meter display shows “----” (four bars) which
shows 75-100% sensor saturation to prevent the loss of a sample.

40
• Seal the dosimeter with caps after analysis to prevent mercury contamination during
storage.
• If your readings exceed 75 nanograms or more, try the recommendations described next
or call AZI Customer Service at 800-528-7411 or 602-470-1414 for assistance.
13.4 Non-Standard Flow Rates and Dilution Modules
You may use a pump with a flow rate up to 50 or 60 cc/min, but be aware that there are certain
limitations. If your pump flow rate exceeds 2 cc/min and your average dosimeter analysis
produces nanogram levels of 75 or more, it may be easy to collect more mercury beyond the
linear range of the 431-X sensor. You thus risk over ranging your instrument and losing your
collection data. Higher flow rates may also impair the capture efficiency of the dosimeter.
We recommend that you drop your flow rate or use a dilution module* (AZI P/N Z2600-3911).
Lowering the flow rate to decrease the sample volume provides the greatest accuracy. Using a
dilution module introduces an additional 15% inaccuracy to your analysis. As an alternative to
the dilution module, sample for shorter time periods.
Dilution Module Specifications
Accuracy +/- 15% of 10:1 ratio
Input concentration range:
Low 0.7 mg/m3
Hg
High 5.0 mg/m3
Hg
Housing Nylon
Dimensions 1" w x 2.7" l x 3" h
Weight 3.3 oz
The dilution module is factory set to a 10:1 ratio. The mass of mercury entering the dilution
module is reduced by 90%, leaving a 10% (X10 dilution) concentration to be introduced into the
Jerome 431-X. since this ratio can change slightly with use, it is important to occasionally
determine the current dilution module ratio to ensure accurate results. For normal applications a
X8 to X12 ratio is recommended. The 431-X Functional Test Kit contains all accessories
necessary to determine the current dilution module ratio.
Call Customer Service at 800-528-7411 or 602-470-1414 if you have questions about flow rates
or applications.
*The dilution module contains Resisorb™, mercury vapor adsorbent. For safety information, see
the supplier’s Material Safety Data Sheets (MSDS) or call AZI Customer Service at 1-800-528-
7411 or 1-602-470-1414 for assistance in obtaining the MSDS.

41
13.5 Dilution Module Ratio Check
NOTE: Wait a minimum of 30 minutes after a sensor regeneration before starting this
procedure.
Direct 431-X Readings:
• Connect the instrument, septum holder assembly and zero air filter, with arrow pointing
to the instrument, as shown below.
• Press the Jerome 431-X power ON button.
• Inject 1 cc of mercury saturated vapor into the septum, according to the Syringe
Technique described on page 32 (431-X Functional Test, Appendix A).
• Make 3 additional 1 cc injections and record the digital meter readings (include the
decimal points).
• Average the results of the last 3 injections.
• Remove the septum assembly and zero air filter from the instrument.
Most Accurate Method
Perform the above test, however attach the dosimeter, septum holder assembly and zero air filter
to the sampling pump that will be used. (See diagram.) Collection efficiencies should be
approximately 100% up to 60 cc/min. If high flow rates are used, the final calculation should
include this collection efficiency correction factor.

42
Loading the Dosimeter
• Connect your pump, dosimeter, septum holder assembly and zero air filter together with
1/8" an d 3/16" Tygon™ tubing as shown below.
• Turn on the pump.
• Inject 10 cc’s of Hg into the septum, 1 cc at a time.
% A total of ten, 1cc injections, one after another.
• Wait 30 seconds after the last injection then turn off the pump.
• Remove the dosimeter, septum assembly and zero air filter from the pump.
• Connect the instrument, dilution module, dosimeter, zero air filter and dosimeter lead set
as shown below.

43
• Attach the power cord to the 431-X and plug it into AC power.
% AC power is required to heat the dosimeter.
• Press the Jerome 431-X Power ON button and then press the SAMPLE button.
% The digital meter reading appears in approximately 15 seconds.
• Record the digital meter reading (include decimal point). Wait 60 seconds, then press
SAMPLE again and record this reading.
• Repeating the heating process ensures complete release of mercury from the dosimeter
coil.
• Add the two digital meter readings together.
% The sum of the two digital meter readings is the figure you will use in your
calculations and is referred to as the meter response (MR).
• Repeat this procedure two more times.
• Average the three meter responses you obtained in this section.
Dilution Module Ratio Calculations
• Multiply the average obtained for Direct 431-X Readings by 10 (the number of 1 cc
injections).
% Divide this result by the average obtained in the section “Loading the Dosimeter” on
page 42.
• Use the result as the dilution module ratio in your dosimeter analysis.
EXAMPLE:
Direct 431-X readings
0.102 mg/m3
0.103 mg/m3
0.104 mg/m3
0.103 mg/m3
average
Loading the dosimeter
0.120 mg/m3
0.113 mg/m3
0.100 mg/m3
0.111 mg/m3
Step 1 (above)
0.103 mg/m3
x 10 = 1.030 mg/m3

44
(Meter Response converted to nanograms (Ng) of mercury) X
Dilution Module Ratio
Sample Volume
= Sample Concentration
Step 2 (above)
(1.030 mg/m3
) / (0.111 mg/m3
= 9.4
Dilution module ratio 9.4:1
NOTE: For normal applications a X8 to X12 ratio is recommended. If your ratio is not
within this range, call Customer Service at 800-528-7411 for assistance.
13.6 Analysis with a Dilution Module
NOTE: Wait a minimum of 30 minutes after a sensor regeneration before starting this
procedure.
• Connect the system as shown in the figure below.
• Attach the power cord to the 431-X and plug it into
AC power.
% AC power is required to heat the dosimeter.
• Press the Jerome 431-X power ON button and then press SAMPLE button. The digital
meter reading appears in 12 seconds.
• Record the digital meter reading (include the decimal point). Wait 30 seconds, then press
SAMPLE button again and record this reading.
% Repeating the heating process ensures complete release of mercury from the
dosimeter coil.
• Add the two digital meter readings together.
% The sum of the two digital meter readings is the figure you will use in your
calculations and is referred to as the meter response.
• The following calculations will provide the mercury concentration in mg/m3
based on a
time weighted average.

45
( ) ( )0 600 875
960
0 055
3. / . / /
. /
mg m ng mg m
cc
ng cc
×
=
• Alternately, DIP switch #2 can be set to OFF and the digital meter will display nanograms
Hg directly.
MR (meter response) total of the two digital meter readings in mg/m3
87.5 ng/mg/m3 conversion factor, a constant which changes the meter response
to nanograms of Hg
DM dilution module ratio the ratio determined on page 43
SV (sample volume)
pump flow rate (in cc/min) multiplied by sample time (in
minutes)
Sample concentration ng/cc = mg/m3
EXAMPLE:
Assume the following values.
Meter Response (MR) 0.600 mg/m3
(sum of the two meter response readings)
Conversion Factor 87.5 ng/mg/m3
(constant)
Dilution Module Rate 9.4
Pump Flow Rate 2 cc/min
Sampling time 8 hours = 480 min
Sample volume 2 cc/min X 480 min = 960cc
A time weighted average during an 8 hour period is calculated by:
% Convert the meter response (the total of the two digital meter readings) to nanograms
of mercury.
' The MR (0.600) multiplied by the conversion factor (87.5) equals nanograms of
mercury
' 0.600 x 87.5 = 52.5 nanograms of Hg
% Determine the actual mass of Hg collected by the dosimeter.
' Nanograms of mercury multiplied by the dilution module ratio.
' 52.5 nanograms x 9.4 = 493.5 nanograms
% Determine the total volume of air sampled.
' The pump flow rate multiplied by 60 min/hr multiplied by 8 hours.
' 2 cc/min x 60 min/hr x 8 hr = 960 cc
% Determine the Hg concentration (time weighted average) of the dosimeter.
' The mass of Hg collected by the dosimeter divided by the total volume of air
sampled.
' 493.5 nanograms divided by 960 cc = 0.0514 ng/cc of Hg = 0.0514 mg/m3
of Hg

46
• Check the sensor status after each dosimeter analysis.
• Seal the dosimeter with tubing after analysis to prevent excessive mercury contamination
during storage.
IMPORTANT:
Perform a sensor regeneration as soon as the meter display shows “----” (four bars)
to prevent the loss of sample.
Dosimeter Reference Chart 431-X
Expected concentration, related to sample volume and meter response
= Indicates the optimum meter response for that concentration with the corresponding volume
Volume of
Air in
mg/m3
431-X Meter Responce
0.5 HL HL HL HL HL
0.1 0.274 0.549 HL HL HL
0.05 0.137 0.274 0.549 HL HL
0.025 0.069 0.137 0.274 HL HL
0.005 0.014 0.027 0.055 0.823 HL
0.001 0.003 0.005 0.011 0.165 0.329
240 480 960 14,400 28,800
(.001 micrograms/m3
= 1 nanogram/m3
)
= Indicates the optimum meter response for that concentration with the corresponding volume
431-X meter response
Volume of air
in micro-
grams/m3
0.5 0.247 0.494 0.823 HL HL HL HL
0.05 0.025 0.049 0.082 0.274 0.823 HL HL
0.01 0.005 0.010 0.016 0.055 0.165 0.329 0.494
0.005 0.002 0.005 0.008 0.027 0.082 0.165 0.247
0.0005 0.000 0.000 0.001 0.003 0.008 0.016 0.025
43,200 86,400 144,000 480,000 1,440,000 2,880,000 4,320,000

47
Meter Responce X 87.5
Flow Rateof SamplingPump X Time
Concentration(mg / m )3
=
Relationship of flow rate and time to total sample volume
Total volume collected in cc
Flow Rate
in
cc/minute
1000 60,000 120,000 240,000 480,000 720,000 1,440,000 2,880,000 4,320,000
100 6,000 12,000 24,000 48,000 72,000 144,000 288,000 432,000
60 3,600 7,200 14,400 28,800 43,200 86,400 172,800 259,200
20 1,200 2,400 4,800 9,600 14,400 28,800 57,600 86,400
10 600 1,200 2,400 4,800 7,200 14,400 28,800 43,200
2 120 240 480 960 1,440 2,880 5,760 8,640
1 2 4 8 12 24 48 72
Hours of Sample Collection
Use this formula for calculating the concentration of mercury in air:

48
14 APPENDIX C - INTERNAL DIP SWITCH SETTINGS
Main circuit board RED DIP switches (SW2)
This is the red DIP switch box located at the
top, center of the instrument’s main circuit
board.
The 431-X provides regulated film heat at
both 50 Hz and 60 Hz line frequencies. This
also provides two ranges of preset but
unregulated film heat (100-120/200-240 volt
and 110-130/220-260 volt ranges). The two ranges are available to reduce the effects of chronic
low or high line voltage.
Note: The ranges are doubled when the AC line selector switch is set to the 220V position. The
DIP switch positions 1 and 6 must be properly set.
DIP 1 DIP 6 Function
OFF OFF 60 Hz regulated film heat (100-130/200-260VAC)
OFF ON 50 Hz regulated film heat (102-130/205-260 VAC)
ON OFF 50/60 Hz preset film heat (110-130/220-260 VAC)
ON ON 50/60 Hz preset film heat (100-120/200-240 VAC)
Regulated film heat should normally be used (DIP 1 OFF) except in the few cases where
extremely dirty line voltage conditions may exist. These conditions might be found where large
motors are being controlled or other situations may exist where the voltage may vary outside the
100-130 VAC range with regularity. In those cases the two preset heat ranges will allow some
degree of satisfactory operation.
Switch
Number
Normal
Position
Action
2 ON Nanograms mode
3 ON Displays relative (not true)voltage during regen (0-255)
4
OFF Display L-O-H when “zero” button pressed
ON Display 00-99 when “zero” button pressed
5 ON Locks into 0-10mg/m3
range (survey mode)

49
15 APPENDIX D - OPTION BOARD
15.1 Dip Switch Settings
This is the six position DIP switch located on the Option Board, the small board mounted near
the center of the main board.
Summary of blue DIP switch functions:
Switch Function
1 Regeneration enable and time
2 Regeneration enable and time
3 Auto sample enable
4 Auto sample time
5 Auto sample time
6 DC power mode enabled (when ON and regeneration is started, this closes
the relay on the data logger interface board to switch the inverter ON.
Timed Sensor Regeneration (Timed regeneration attempted one hour after start, then at
interval.)
Switch #1 Switch #2 Regeneration
Interval
OFF OFF OFF
ON OFF 6 Hours
OFF ON 24 Hours
ON ON 72 Hours
Auto Sampling (Without JCI or data logger attached)
Switch #3 Switch #4 Switch #5 Sampling Frequency
ON ON ON No automatic sampling
OFF ON ON 5 minutes
OFF OFF ON 15 minutes
OFF ON OFF 30 minutes
OFF OFF OFF 1 hour
NOTE: Switch instrument power off before changing DIP switch settings.

50
15.2 Instrument Zeroing
• The Jerome 431-X has essentially three zeros:
% The instrument automatically rezeroes between samples and each sample is a unique
reading. To take a sample, simply press the SAMPLE button.
% The zero on the membrane switch is used to re-establish a baseline between the
reference and sensor gold film after a sensor regeneration. This zero is manually
adjusted by pressing the ZERO button and turning the potentiometer on the top of the
instrument until the display reads 0. Adjust only after sensor regeneration; it is
normal for H to be displayed after sampling.
% The 431-X option board provides an auto zero feature that is invisible to the user. In
some cases, the instrument does not resume sampling after a regeneration. At that
time .L.L.L appears on the display when the ZERO button is pressed and the error
message “manual bridge adjust needed” will be added to the notes column of the JCI
text file if the JCI software is used. If this problem persists, it may be necessary to re-
set the auto zero.
• When necessary to re-adjust the auto zero point:
% Turn the instrument off.
% Note original DIP switch settings.
% Turn DIP switch 4 on red DIP box to ON.
% Set the switches on the option board’s blue DIP box to 1,2,6 OFF; 3,4,5 ON.
% Turn the instrument ON.
% Switch option board DIP #1 OFF and ON three times, leaving it ON.
% While pressing the ZERO button, turn the potentiometer on the option board until the
numbers increase (maximum of 20). Note the display will flicker one digit.
% Return all switches to original position.
NOTE: The higher the auto zero number, the lower the capacity of the sensor and the more
sensor regenerations are needed.
15.3 Automatic Regeneration
• The auto-regeneration should take place at the pre-configured time, with these
exceptions:
• The instrument will always attempt a regeneration one hour after the SAMPLE button is
pressed. The auto-regeneration will take place at the specified interval after that initial
hour (for example, at hour 7, 13, 19, etc, if programmed for 6 hour auto-regeneration).
• The instrument may NOT always perform the regeneration. The circuit forces the
instrument towards 100% saturation to initiate the regeneration. If the sensor has not seen
much mercury, the instrument will not auto-saturate. In this case, a regeneration will not
take place. The instrument will always regenerate whenever the sensor is saturated.
There should be no significant loss in sensitivity when a sensor auto-regeneration does
not occur for 2-3 days.

51
• Test this feature by initiating an auto-regeneration by turning the instrument ON and
switching the daughter board’s blue DIP switch #2 OFF and ON. If the line cord is
plugged in, do not interrupt this regeneration cycle.
15.4 DC Power Mode Enable
15.5 Instruments with the 431-X option board modification can be used with any +12 VDC
source for continuous operation, if the AZI DC-AC Power Inverter Kit, part number
Y031-0902, is installed.
15.6 The instrument requires 115 volts AC for regeneration. To preserve the life of the DC
power source, the DC-AC inverter will switch on automatically for the regeneration only.
The external switch on the inverter should always be OFF to preserve battery life during
normal sampling.
15.7 When the instrument starts a regeneration and when DIP Switch #6 is ON, the instrument
sends a signal to close the relay on the 431-X data logger interface board mounted
between the data logger and the instrument. This switches the inverter ON using the
inverter’s internal switch.
NOTE: When this mode is enabled, the instrument does NOT check for 115 VAC for the
regeneration. If there is no AC power to the instrument, and a regeneration is
initiated, the instrument will flash .H.H.H (rather than .P.P.P), however the sensor
will not heat, nor will the sensor clean.

52
16 WARRANTY
Seller warrants to buyer that products delivered pursuant to this Agreement shall, at the time of delivery,
and for a period of one (1) year thereafter (the Internal Battery Pack, where applicable, is warranteed for
a period of ninety [90] days only), be free from defects in material or workmanship and shall conform to
seller's specifications or such other specifications as seller has agreed to in writing. Seller's obligations
with respect to claims under this warranty shall be limited, at seller's option, either to the replacement of
defective or non-conforming product or to an appropriate credit for the purchase price thereof subject to
the provisions of seller's Warranty Policy as amended from time to time, said Policy being incorporated
herein by reference.
Return products under warranty claims will be shipped to seller's plant by buyer at buyer's expense and
shall be accompanied by a statement of the reason for the return and an approved Return Material
Authorization Number issued by seller. Buyer remains responsible for payment for products not
accepted for warranty adjustment and freight and handling costs associated therewith.
Notwithstanding the foregoing, no warranty shall be enforceable in the event that product has been
subjected to environmental or stress testing by buyer or any third party without written approval of seller
prior to such testing. Further, no warranty shall be enforceable if the alleged defect is found to have
occurred as a result of misuse, neglect, improper installation, repair, alteration, accident, or improper
return handling procedure by buyer.
Discontinued product is warrantied only for a credit or replacement at seller's option.
THE EXPRESS WARRANTIES GRANTED ABOVE SHALL EXTEND DIRECTLY TO BUYER
AND NOT TO BUYER'S CUSTOMERS, AGENTS, OR REPRESENTATIVES AND, EXCEPT FOR
WARRANTY OF TITLE, IS IN LIEU OF ALL OTHER WARRANTIES, WHETHER EXPRESSED OR
IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
PURPOSE AND MERCHANTABILITY, SUCH OTHER WARRANTIES BEING SPECIFICALLY
DISCLAIMED BY SELLER. IN NO EVENT SHALL EITHER PARTY'S LIABILITY FOR ANY
BREACH OR ALLEGED BREACH OF THIS AGREEMENT EXCEED THE TOTAL EXTENDED
PRICE OR PRICES SHOWN ON UNFILLED ORDERS, NOR SHALL EITHER PARTY BE LIABLE
FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM
BREACH OR ALLEGED BREACH.
Notwithstanding the foregoing, if any product covered by order(s) placed hereunder is designated as
"developmental" “prototype" or "experimental," no warranty whatsoever except a warranty of title to
component materials, will be applicable thereto and buyer shall indemnify seller for any claims for
liability asserted seller in connection therewith.
Medical Applications: Seller's products are not designed for use in medical appliances, devices or
systems where malfunction of buyer's product can result in personal injury. Buyer's customers using or
selling buyer's products for use in medical applications do so at their own risk and agree to fully
indemnify buyer.
The foregoing state the entire liability of seller in connection with products supplied hereunder.

53
TRADEMARK AND COPYRIGHT PROTECTION
Jerome Instrument, Arizona Instrument, AZI and the stylized AZI are all registered trademarks of
Arizona Instrument LLC.
Copyright 1990-2000, Arizona Instrument LLC. All Rights Reserved.
Mallcosorb™ is a registered trademark of Mallinckrodt.
Resisorb™ is a registered trademark of J.T. Baker Chemical Company
Tygon™ is a registered trademark of Norton.
Jerome 431-X Mercury Vapor Analyzer Operation Manual
Part Number SS-086
Revision D
September, 2000
If you have any questions regarding the operation of this instrument, please call our toll free
number from the United States and Canada 800-528-7411. Internationally, call (602) 470-1414
or fax (480) 804-0656.
1219 West 4th
Street
Tempe, AZ 85281 USA
http://www.azic.com
e-mail:
AZI Sales, sales@azic.com
Customer Service, support@azic.com

Jerome 431 manual

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Jerome 431 manual