4G pressure wireless sensor user manual.doc

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[Please read the instructions carefully before installation]
4G pressure wireless sensor user manual
KRD-WD-4G
skill
art
instrument for drawing
circles
rattle
write

1
edition:A
Release date: 2019.8.06
catalogue
1 Safety Guide............................................................................................................................................................ 3
2 Overview.....................................................................................................................................................................4
2.1 Product features..........................................................................................................................................................4
2.2 Technical
parameters..........................................................................................................................................................5
2.3 Parameter
explanation..........................................................................................................................................................5
2.3.1 Upload time interval............................................................................................................................................... 5
2.3.2 Sampling time interval............................................................................................................................................... 5
2.3.3 The fluctuation
threshold.......................................................................................................................................................5
2.3.4 Low alarm value.......................................................................................................................................................6
2.3.5 High alarm value.......................................................................................................................................................6
2.3.6 Online data.......................................................................................................................................................6
2.3.7 Alarm information.......................................................................................................................................................6
2.3.8 ICCID and IMEI number......................................................................................................................................6
3 External dimensions and installation
precautions......................................................................................................................,.........7
4 Button and menu instructions...........................................................................................................................................7
5 Data analysis...........................................................................................................................................................10
6 Downstream data format (commands are in
hexadecimal).....................................................................................................................12
7 Transportation and
storage........................................................................................................................................................14
8 Fault diagnosis, troubleshooting and
warranty.................................................................................................................................... 14

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1. Safety guidelines
 After receiving the product, please check whether the package and appearance are intact, and
check whether the model is consistent with the purchased product;
 Working environment of product use: -20~+60℃ (temperature), 0%~93% (humidity);
 Network environment: CSQ is greater than 12, and normal communication can be made;
 Make sure the installation is firmly fixed;
 An independent ball valve should be installed at the front end of this product installation for
equipment maintenance;
 Please keep all the original packaging materials properly, so that when there is a problem, you
can use the packaging materials to package the products and send them to the manufacturer
for treatment. The company does not assume any responsibility for the accidental damage
caused by non-original packaging materials during transportation.
 This equipment can only be installed, connected, debugged and maintained by qualified
professionals (such as electricians) who have been trained. It is necessary to fully comply with
the guidelines of the User Manual, relevant application specifications, laws and regulations, and
have the corresponding qualification certificates (related to the application conditions).
 Before installing this equipment, the installer must read the User Manual and understand and
comply with the provisions therein.
 The equipment shall not be modified or repaired unless permitted by the User Manual.
 When this equipment is repaired, it must be clearly allowed to repair and use the original
equipment.
 The IOT monitoring terminal will connect to the network and send data according to the sending
time interval set by the user. After the data is successfully sent, it can be sent in real time by
pressing the button briefly. If the meter fails to enter the network after several attempts, the
meter will enter the low-power mode and the wireless icon will disappear from the screen.
 Do not use the product for other purposes or modify the product, otherwise the company will
not be responsible for the resulting accidents.
 Non-professionals, please do not open the front cover or rear cover of the product at will to
avoid misoperation and equipment failure;
 If there is any abnormal phenomenon of the product, please contact the after-sales technical
personnel of the company for maintenance (the technical support contact information is at the
end of the page. The company shall not assume any responsibility for any problems caused by
unauthorized modification or maintenance).

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 For the safe use of this device, please read this manual carefully before using it. After reading
and understanding it, keep it in a designated place for your reference at any time.
2 Overview
The 4G Temperature Monitoring Terminal (hereinafter referred to as the IOT Monitoring Terminal) is a low-power,
wireless communication-enabled smart instrument. Relying on a mature 4G network, it achieves wireless transmission of
on-site instrument data to the cloud platform. The product allows users to set parameters such as high/low alarm values,
fluctuation thresholds, upload times, collection frequencies, and alarm switches via buttons on the terminal. It also
enables remote customization of these parameters through the cloud platform, allowing users to view real-time and
historical data online, ensuring accurate and timely information about the site. The instrument uses a large-capacity
lithium battery to provide stable and reliable power, ensuring safe operation for over 3 years (1 hour per upload). The
independently developed low-power system not only provides on-site data to users through an LCD screen but also
supports wireless module connectivity
Data transmission, integrating data into the user's own cloud platform. Powerful control algorithms enable practical
functions such as signal breakpoint continuation, automatic mode switching, real-time pressure fluctuation alerts, and
one-click awakening. The primary application areas are in outdoor or environments with inconvenient power supply,
such as heating, water supply, oil, and gas pipelines, for temperature or pressure monitoring. Data including the device's
power consumption, signal strength, pipeline temperature information, and alarm information are transmitted in real-time
to the monitoring center via wireless networks. The monitoring center stores, analyzes, queries, and processes alarm
information, achieving wireless signal transmission and information exchange without on-site wiring, saving labor and
construction costs, and helping users achieve timely and efficient pipeline supervision. This product supports the
combined use of multiple sensors for temperature, pressure, and flow.
2.1 Product features.
 The instrument is 330 degrees rotatable to better meet installation requirements
 Intelligent sensing, combined measurement
 Multi-flow sensor intelligent combination;
 Pressure and temperature multi-sensor combination

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 The high precision 24-bit AD chip is used to detect the pressure change, which has the
characteristics of fast collection speed and high accuracy;
 The upper limit, lower limit and dynamic change threshold alarm information are sent in time;
 Support local (serial) parameter setting;
2.2 Technical parameters
 Display mode: five-digit LCD display
 Test medium: liquid or gas compatible with the material
 Accuracy grade: 0.1%FS, 0.2%FS, 0.5%FS
 Stability: ±0.2%FS/ year, ±0.5%FS/ year
 Working frequency: 885MHz~915MHz, 1885MHz~1915MHz, 2170MHz~2200MHz
 Working voltage: 3.6VDC battery
 Battery capacity: 19000mAh
 Sleep current: <30uA
 Current sent: <230mA
 Input current: <15mA
 Protection class: IP65
 Communication protocol: standard LWM2M protocol
 Working temperature: -20~60℃
 Working humidity: 0%~95%RH (no condensation)
 Threaded joints: M20*1.5, G1/2, etc
 Data transfer rate: 300bps~5.4Kbps
 Maximum transmitting power: 25db
 Receiver sensitivity: -150dBm (SF=12)
2.3 Parameter interpretation
2.3.1 Upload time interval
Upload time interval is the time interval for the instrument terminal to upload data regularly. This option has
1min~9999min. Users can consider it comprehensively
Specific requirements and product battery life Settings.
2.3.2 Sampling time interval
The sampling interval is the time interval for the instrument terminal to periodically sample data. This option ranges from
1S to 9999S. When sampling, if the obtained data reaches an alarm value (such as exceeding the fluctuation threshold,
higher than the high alarm value, or lower than the low alarm value), it will immediately send a data alarm to the cloud.
Users can consider both actual needs and product battery life settings comprehensively.
2.3.2 Wave threshold
This function is to provide users with alarm information when the temperature fluctuation of the pipe network exceeds
the threshold, so that users can grasp the network in real time

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Temperature status, the fluctuation threshold menu of the instrument terminal can set the temperature fluctuation
threshold. When the current collected temperature value is different from the last collected temperature
An alarm is generated when the absolute value of the difference is greater than the set fluctuation threshold, and no alarm
is generated if it is less than or equal to the previous one
If the fluctuation alarm condition is not met, the alarm information will be cleared.
2.3.3 Low alarm value
This function is to provide users with the pipe network temperature low monitoring function. When the measured
temperature is less than the set low temperature alarm value, the alarm message will be triggered
If the value is greater than or equal to zero, the last low report alarm is cleared.
2.3.4 High alarm value
This function is to provide users with pipe network over-temperature monitoring function. When the temperature
measured this time is higher than the alarm value set in the menu, an alarm message will be triggered
If the value is less than or equal to zero, the last high report alarm will be cleared.
2.3.5 Online data
Online data refers to real-time data that can be seen on the cloud platform. For example, if a user chooses to upload data
at 5min, online data is the latest data collected every 5min that the cloud platform can see. It can be uploaded to the cloud
platform and implemented for historical storage.
2.3.6 Alarm information
The current real-time pressure value is detected to be higher than the high alarm value set in the menu, and the high
alarm information is sent to the cloud platform
The current real-time pressure value is detected to be lower than the low alarm value set in the menu, and the low alarm
information is sent to the cloud platform
The current real-time fluctuation value is detected to be higher than the fluctuation value set in the menu, and the
fluctuation alarm information is sent to the cloud platform
2.3.8 ICCID number and IMEI number
The ID number of the SIM card No. ICCID, which can be used to query traffic, pay bills, etc.
IMEI The IMEI number of the wireless module, which needs to be provided when registering the network connection
cloud platform
3. External dimensions and installation precautions
W arning: Do not disassemble the product
without authorization!
Do not press the membrane of the measuring
element with your finger!

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To install correctly, follow these points:
1. The pressure pipe should be as short as possible and avoid sharp bends.
2. The installation slope of the pressure pipe should not be less than 1:12 to avoid sedimentation.
3. Before connecting the pressure pipe to the transmitter, it is best to flush the measured medium.
4. If the medium is liquid, the pressure pipe should be completely emptied.
5. The layout of the pressure pipe shall allow bubbles in the measured liquid or sediment in the measured gas to flow
back into the process pipe.
6. There shall be no leakage during the installation of pipelines.
4 Button and menu instructions
Left key: backlight switch / shift / send M key: menu Settings / confirmation Right key: power voltage / temperature
value / value modification,
Long press the left button to enter the shutdown state when "OFF" appears. No data is sent during shutdown. In this state,
the IOT monitoring terminal consumes the least power, but it also stops collecting and uploading pressure data. To
resume operation, long press the left button again after shutting down; the screen will display "ON." After turning on, the
device first connects to the cloud, showing "COON." Once connected successfully, it exits the connection status and
displays normally. At this point, a marker appears at the bottom left corner, indicating a successful
network connection.
4.1 Networking
The IOT monitoring terminal will connect to the network and send data according to the sending time interval set by the
user. After the data is successfully sent, it will be sent through a short press of the button,
The display temperature can be changed by visual switching, and the display pressure value can be automatically
switched. If the meter fails to enter the network after several attempts, the meter will enter the low-power mode
(The table will normally collect data), and the wireless icon will disappear from the screen.
2.3.6 Offline data and reissue
Offline data is the on-site data cached when the device cannot normally enter the network to upload data. When the
device fails to upload data, the device will
The on-site data is cached regularly according to the set upload time interval, and the cached offline data is uploaded
after the network condition of the device is restored.
In general, if the data is uploaded once an hour, the offline data can be stored for 3-4 months without network.
4.2 Switching between interfaces
The product can display pressure, temperature, voltage values, and signal values in a loop by pressing the right button for
a short time. When the signal value is greater than 41, the signal is good, and data transmission is relatively stable with a
high success rate; when the signal value is greater than 31 but less than 41, the signal stability is relatively poor, which

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may affect the transmission success rate; when the signal value is less than 26, the signal stability is poor, and the
probability of transmission failure is relatively high, affecting the transmission success rate.
4.3 Menu
Short press the M key to enter the menu password setting; the first group of menu passwords is 0008;
(The parameters in this group are calibrated at the factory. Non-professionals should not modify them)
order
numb
er
symbol Menu name span Menu description
1 SNR Input signal
selection
IIC/ADC sensor signal
2 SnSH sensing switch ON/OFF Turn on or off the corresponding sensor
2 GAiN Pressure
amplification
factor
12、20、30、40 Adjust the pressure signal amplification
factor
3 ADL Zero AD value
calibration
-1999~9999 When the pressure value is zero, press the
M key to confirm and calibrate
4 ADH Full AD value
calibration
-1999~9999 When the pressure value is full, press the
M key to confirm and calibrate
5 DPL Lower limit of
range
-1999~9999 Set the factory price, please do not change
6 DPH Upper limit of
range
-1999~9999 Set the factory price, do not change
7 UNT Unit selection MPa, KPa, Bar,
etc
Pressure, level and other units
8 DOT Decimal places 0~3 You can set up to 4 decimal places
9 FLTR Filter constant 1~9 Display value refresh rate, 1 is the fastest
10 SAVE Save Settings YES/NO The modified parameters must be saved to
be valid
11 END Exit the menu EXIT Exit menu Settings
The password of the second group menu is 0006;
order
numb
er
symbol Menu name span Menu description
1 ESNR Select the sensor
type
0~9999sec The default is 0
2 ALH High alarm value -1999~9999 The default is 9999, with the decimal
point following
3 ALL Lower alarm
value
-1999~9999 The default is-1999, with the decimal
point followed
4 ALDE Notification
mode
HL/IN/CAPH/
CAPL
Upper and lower limit alarm / range
alarm, default high alarm
5 PEEK Threshold of
fluctuation
1~9999 The fluctuation threshold is 999 by default

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6 AL-S Alert the gate ON/OFF Always on / always off
7 ALLY Sensor alarm
delay
1~99 Sensor alarm delay is 5 by default
8 SPD Sample time
interval
1~9999sec The default is 10sec
9 -UP- Normal upload
time interval
1~9999min The default is 10min
10 ALUP Alarm upload
time interval
1~9999min In the alarm state, the upload rate is 5min
by default
11 OFT zero
compensation
-9.99~9.99 The opposite number of the zero deviation
can be set for compensation
12 CUT Zero point cut YES/NO The zero point small signal is removed,
and the 0.5%FS is removed
13 DDDD Customer-
defined
parameters
1~255 The customer can set this number to
represent different information
14 SAVE Save Settings YES/NO The modified parameters must be saved to
be valid
15 END Exit the menu EXIT Exit menu Settings
5. Data analysis:
Protocol resolution remarks
4B45 Protocol header
20 User data, total bytes
0002
Total number of
messages passed (from
1 to 65536 cycles)
0144
Sample value
(pressure)
276(0144 is converted to 10) at this time, the temperature =27.6℃
0144
Sample value
(temperature)
276 (0144 is converted to decimal), at this time the temperature = 27.6℃
(the temperature unit is fixed as ℃, with a fixed decimal point)
01 Pressure decimal point
Dot: "3.000", "2.00", "1.0", "0" (3~0 is 3 decimal places to no decimal
place), this 01 indicates 1 decimal point
00 07 pressure unit
Unit: MPa, kPa, Pa, BAR, PSI, kgfcm2, kgfm2, ℃, ℉, mm, cm, m, mV, V,
mA, A, blank(0~16 represents MPa~blank) at this time 07 represents ℃
0DA6 cell voltage
3494 (0DA6 converted to decimal), at this time the voltage =3.579V (fixed
to three decimal places)
270F
Upload pressure
threshold is high
-32768-32767 (270F converts to 10) is now 999.9 (with the Dot being 1)
F8 31
Upload pressure is low
threshold
-32768-32767 (F8 31 converts to decimal) is now-199.9 (with the Dot being
1)

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0014
Upload the pressure
fluctuation threshold
An alarm is generated when the absolute value of the difference between the
current pressure value and the last pressure value is greater than the set
fluctuation threshold. (0014 is converted to 10) At this time, it is 2.0
(combined with the previous Dot is 1 bit)
02
Upload pressure alarm
mode
00-low warning, 01-range warning, 02-single high warning, 03-single low
warning (standby)
270F
Upload the temperature
threshold
-32768-32767 (270F converts to 10) is now 999.9 (with the Dot being 1)
F8 31
threshold
-32768-32767 (F8 31 converts to decimal) is now-199.9 (with the Dot being
1)
0014
fluctuation threshold
An alarm is generated when the absolute value of the difference between the
current pressure value and the last pressure value is greater than the set
fluctuation threshold. (0014 is converted to 10) At this time, it is 2.0
(combined with the previous Dot is 1 bit)
02
alarm mode
00-low warning, 01-range warning, 02-single high warning, 03-single low
warning (standby)
20
Alarm and fault
marking
Binary: "0000 0001" pressure alarm; "00000010" pressure fluctuation alarm;
"0000 0100" temperature alarm, "00001000" temperature fluctuation
alarm, "0100 0000", water immersion alarm No.1 "1000 0000" sensor
fault alarm,
For example, 0X01 binary is 0000 0001 to indicate pressure alarm, and
0X03 binary is 0000 0011 to indicate pressure and temperature alarm at the
same time.
00 alarm switch When 00 is the alarm is turned off, and when 01 is the normal alarm.
05
Confirm the number of
times before reporting
the alarm
Upload confirmation number After detecting 1-9999 "actions", upload is
performed
003C
Normal sampling
interval
1-9999s (003C is converted to decimal) is now 60S, in seconds.
00F0 Normal upload interval 1-9999min (00F0 converts to decimal) is 240 minutes, in minutes.
00 02
Upload interval when
alarm is raised
1-9999min
63 signal intensity Real-time reflection of signal strength
00
// Use available data
volume as backup
Breakpoint continuation flag
00 Customer-defined data
85F2 CRC verification
FFF User data end code

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866898040293383
The IMEI number is
fixed as 15-bit data
The IMEI number of the wireless module, which needs to be provided when
registering the network
FFFF MEI and CCID interval Used to separate the IMEI number from the CCID
898611192480160
01457
CCID number, fixed to
20 bits of data
The ID number of the SIM card can be used to query traffic, pay bills, etc
DADA Protocol end
85F2 CRC verification
6. Downstream data format (commands are in hexadecimal):
order
numb
er
IC digit
capacit
y
Menu name span Menu description
1 D1 4 Upload time interval 1~9999min The default is 10min
2 D2 4 Sample time interval 1~9999sec The default is 10sec
3 D3 4 High pressure alarm
value
-1999~9999 The default is 9999, with the decimal
point following
4 D4 4 Pressure is below the
alarm value
point followed by display
5 D5 4 Pressure fluctuation
threshold
0~9999 The default is 9999, with the decimal
point following
6 D6 4 Notification mode HL/IN/CAPH/
CAPL
Upper and lower limit alarm/within range
7 D7 4 Temperature high alarm
value
-1999~9999 The default is 9999, with the decimal
point following
8 D8 4 Temperature low alarm
value
point followed
9 D9 4 Temperature fluctuation
threshold
0~9999 The default is 9999, with the decimal
point followed
10 DA 4 Notification mode HL/IN/CAPH/
CAPL
Upper and lower limit alarm/within range
11 DB 4 Output alarm switch ON/OFF Always on/off. When 01 is set, the alarm
is valid; when 00 is set, the alarm is

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invalid.
12 DC 4 Report upload rate 1~9999min In the alarm state, the upload rate is 5min
by default
13 DD 4 Number of times the
sensor alarm is
confirmed
1~99 Sensor alarm delay is 2 by default
14 DE 4 Set the compensation
value
-1999~9999 Set the compensation value
15 DF 4 Set the zero point shear
value
-1999~9999 Set the zero point shear value
For example: (The command is in hexadecimal):
1. Change the upload time to 10 minutes: write D1000A;
2. If the input is negative, the data is signed integer,
For example, to input the low alarm-5; the actual input is FFFB; input: A4 FF FB;
Input low level alarm
7 Transportation and storage
After calibration, the instrument is packaged in a carton (GB/T 13384-2008) to protect it from damage.
After the IOT monitoring terminal is turned off, it should be clean, dry and cool (preferably at +20 degrees or lower
temperature environment, and not more than +30
It is placed under the condition of (degree).
The product nameplate includes the serial number, range, accuracy class, date of manufacture and other related
information.
Important: Be sure to provide the instrument serial number when querying
8 Fault diagnosis, troubleshooting and warranty
If the sending interval is
less than two hours, do
not fill in here. If it is
more than two hours, fill
in the time that exceeds
the sending interval

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* Battery replacement: When the battery symbol in the lower left corner of the screen flashes, it indicates that the battery
is low and should be replaced in time;
* Operation steps: rotate the rear cover counterclockwise to open the battery compartment; after replacing the battery,
close the rear cover and rotate clockwise to lock the rear cover to achieve waterproof effect;
after-sale service
One year warranty can be enjoyed for all products purchased from the company;
If the product fails during the warranty period and is found to be a quality problem after testing by the company, the
company shall bear all the maintenance costs;
The damage of components or pressure diaphragm caused by failure to follow the use specifications of this manual or
unauthorized disassembly of the product does not fall within the scope of product warranty.
If the product is faulty, please contact us and confirm the maintenance with the following information:
Product failure phenomenon;
Description of the site environment where the product is used;
Delivery address and contact information;
Supplemental JESO agreement
{
"sensorDatas":
[
{"flag": "a", "value": 10.2}, pressure (single MPA), temperature (unit ℃), or liquid level value (unit m)
{"flag": "b", "value": 3.527}, voltage value (unit V)
{"flag": "c", "value": 26}, signal value (unit DB)
{"flag": "d", "value": 5} is the customer-defined value
{"flag": "e", "value": 867387060547596}, the unique identification number of the device
{"flag": "f", "str": "89860482122280073596"}, SIM card number
{"flag": "g", "value": 10.2} is the temperature value when it is a combined temperature and pressure equipment
{"flag": "h", "value": -199.9}: high pressure alarm value
{"flag": "i", "value": 999.9}, low pressure alarm value
{"flag": "j", "value": 60} is the normal upload interval, in minutes
{"flag": "k", "value": 30} Alarm upload time interval, unit minutes
]
}

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