SUPMEA SUP-PH8001 User manual

User’s Manual of
Smart water sensor
pH/ORP digital water sensor
1. Safe precautions
Please follow the operating procedures and
precautions of this manual when using
Do not power on before wiring is completed to
avoid danger.
If you find that the instrument works abnormally
or is damaged during use, please contact us
instead of repairing it yourself.
In order to make the measurement more
accurate, the meters must be calibrated
frequently with sensors.
If your electrode has been purchased for nearly
a year or there is a quality problem with the
electrode, please replace it.
Please power on the instrument to warm up for
30 minutes before calibration.
If the product is updated, this manual may be
changed, but we will not notice.
2. Applications
Aquaculture, water testing, informatization data
collection, IoT water testing
3. Features
Isolated power supply design, data stability,
strong anti-interference ability
pH supports automatic/manual temperature
compensation, (Automatically detect whether the
temperature probe is disconnected or faulty,
then switch to manual temperature
compensation) The default is 25.0℃
Support USA/NIST/custom pH calibration
solution, and user-defined ORP standard
solution
Communication: RS485 interface*1 (Modbus
RTU protocol)
4. Protocol function
Protocol instructions support pH, ORP
user-defined calibration solution
Protocol commands can support ID modification
(1-255)
Protocol instructions support factory reset
Other functions to be inquired
5. Product Introduction
The pH digital sensor designed by our company for
the aquaculture industry, with a digital interface
(RS485*1), can be used to measure changes in the
pH/ORP value of the aqueous system within the
range
It has a standard RS485 Modbus RTU protocol
interface function, which can communicate with the
host computer remotely
6. Parameters
Measurement
pH or ORP
Measurement
range
0.00-14.00pH, ±1000.0mV
Resolution
0.01pH,0.1mV
Temperature
range
0- 60℃@0.1℃
Transducer tyoe
pH electrode or ORP electrode
Accuracy
0.02pH | 0.5℃
www.supmea.com
[email protected]
Supmea Automation Co.,Ltd.
Version
U-LPH8001-MYEN1

0.2mV
Output type
RS485 interface*1
Communication
protocol
Standard MODBUS-RTU protocol
RS485
ID
9600, 8, 1, N (default) 1-255
Default ID: 01 (0x01)
Setting method
RS485 remote setting calibration
and parameters
Power supply
12VDC
Power
consumption
30mA @12VDC
Ordering information [Please specify pH or ORP
before ordering]
Standard: pH/ORP digital sensor*1
Customized cable length: dedicated for cleaning the
floating body (40cm), electrode cable length 5m
7. Intelligent module communication protocol
Introduction
Communication interface RS485
Port setting 9600,N,8,1 (default)
Device address 0x01 (default)
Protocol Modbus RTU
Command support 0x03 read register
0x06 write register | 0x10 write register
continuously
Information frame format
8. Register data format
Address
Data name
Transform
coefficient
Status
0
temperature
[0.1℃]
R
1
pH
[0.01pH]
R
2
pH.mV
[0.1mV]
R
3
pH. Zero point
[0.1mV]
R
4
pH. Slope
[0.1%S]
R
5
pH. Calibration
points
-
R
6
system status
.01
format 4*bits
0xFFFF
R
7
system status 02
User command
address
format 4*
bits 0xFFFF
R/W
8
User command.
Result
-
R
9
ORP
[0.1mV]
R
11
ORP. drift
[0.1mV]
R
Remarks
Each address data is a 16-bit signed integer with a
length of 2 bytes
Actual result = register data * Transform coefficient
Status: R = read only R/W = read/write
9. Parameter settings
Address
Data name
Setting range
11
RS485.address
1-255（Default: 0x01）
12
RS485. Baud
rate
4800, 9600 (Default) ,
14400 ,19200
13
RS485.
Communication
format
0 = N81(Default)
1 = N82
2 = E81, 3 = O81
14
ORP.
Customized
±10000
±0.1mV
15
pH.
Customized
0 - 1400
±0.01pH
16
pH. Calibration
type
0 = USA (Default）
1 = NIST
2 = USA Custom,
3 = NIST.Custom
17
Temperature.
Drift
±50 @ 0.1℃
18
Temperature.MT
C
-200 ~ + 600 @ 0.1℃
19
Temperature.
Type
Manual= 0 |
NTC=1(Default)
20
Temperature
Unit
Unit.C = 0 (Default)
Unit.F = 1
Address 0
numerical display
different types of
temperature

10. Common instruction set [HEX]
Read temperature, pH, pH.mV
[Send Tx]: 01 03 00 00 00 03 05 CB
[Receive Rx]: 01 03 06 00 FA 02 BC 00 06 B9 3F
Temperature = 00FA = 250 * 0.1℃= 25.0℃
pH = 02BC = 700 * 0.01pH = 7.00 pH
pH.mV = 0006 = 6 * 0.1mV= 0.6 mV
Set RS485 address
The original address is: 0x01
needs to be modified to: 0x02
[Send Tx]: 01 06 00 0B 00 02 79 C9
[Receive Rx]: 01 06 00 0B 00 02 79 C9 (Set
successfully)
Query the RS485 address (stand-alone mode)
The device address is unknown, you can use the
address 0x00 to send the 03 command
[Send Tx]: 00 03 00 00 00 03 04 1A
[Receive Rx]: 01 03 06 00 FA 02 BC 00 06 B9 3F
Current device address = 0x01
Electrode calibration
Please use the user command set to write a
command to address 0x07 to complete the
operation
pH7.00 | [Send Tx]: 01 06 00 07 00 0D F9 CE
pH4.00 | [Send Tx]: 01 06 00 07 00 0B 79 CC
pH10.00 | [Send Tx]: 01 06 00 07 00 0F 78 0F
[Receive Rx] returns the same command as
[Send Tx], which means the calibration is
successful.
When calibrating, please put the electrode into
the standard liquid, wait for the signal to stabilize
before performing the calibration operation
11. Restore factory default settings
Please use the user command set to write the
command to address 0x07 to complete the operation
restore the factory default | TX: 01 06 00 07 00 D2 B8
56
[Receive Rx] returns the same command as [Send
Tx], which means the recovery is successful.
Execute user commands
Users can write commands to address 0x07 to
perform corresponding device operations.
Serial
number
User command
Decimal
Hexadeci
mal
01
Calibration
PH4.00
11
0x000B
02
Calibration
PH6.86
12
0x000C
03
Calibration
PH7.00
13
0x000D
04
Calibration
PH9.18
14
0x000E
05
Calibration
PH10.01
15
0x000F
06
Calibration
pH.Custom
16
0x0010
07
Calibration
ORP.Custom
21
0x0015
08
Restore factory
default
210
0x00D2
09
Select baud rate
4800
4800
0x12C0
10
Select baud rate
9600
9600
0x2580
11
Select baud rate
14400
14400
0x3840
12
Select baud rate
19200
19200
0x4B00
Note: According to the 16 address pH. Calibration
type, choose to support different standard solution
types
USA standard solution: pH 4/7 / 10.01 NIST standard
solution: pH 4.00 / 6.86 / 9.18
USA. Custom: pH 7 / pH. Custom NIST. Custom:
6.86 / pH. Custom
12. User command error code returned
For example:
Addres
s
Return
code
Error
code
Check code
Error
return
01
86
02
C3 A1
Error
code
Description
0x01
Invalid command or current command is
not available
0x02
The content of this address cannot be
written into data, such as executing
commands,
It means that the current sensor status
cannot perform this operation.
0x03
The current input data is invalid and
exceeds the input range
Other instructions
Command 0x03 Error return command: 0x83
Command 0x06 Error return command: 0x86
Command 0x10 Error return command: 0x90

Device status code
System status.01 Address: 0x06, content format:
4*4bit, 0xFFFF
[HEX]
Err.04
ERR.03
ERR.02
ERR.01
Serial
number
3
2
1
0
Description
System
Reservation
DO
Calibration
DO
Temperature
System status.02 Address: 0x07, content format:
4*4bit, 0xFFFF
Description
System
reservation
ORP
Calibration
ORP
Operating
mode
13. pH/ORP digital electrode preservation and
maintenance
Electrode preservation:
When the electrode is not in use for a short time,
please use the rubber sleeve protective cover +
wet sponge to ensure that the electrode is in a
wet state. The protective cover and sponge are
used to protect the electrode, please do not
discard.
Parts replacement cycle
Electrode: The electrode is recommended to be
replaced in 12 months
Electrode slope: <70%Slope is recommended to
be replaced
Maintenance - cleaning the old sensor
Observe the glass measuring part of the
electrode head. If the glass contact surface is
covered, use a moistened cotton swab to gently
wipe the surface until it is clean.
Maintenance - pH before use
Observe whether there is liquid in the bulb of the
pH electrode sensitive membrane. If it is not
filled with liquid or there are bubbles, shake the
electrode gently to fill the bulb with liquid without
bubbles.
Maintenance - pH repair - unable to calibrate /
after a long time dry
If the sensor is left dry for a long time or its
performance is reduced, you can try to soak it in
pH4.00 buffer for a few minutes, and then soak it
in pH 7.00 buffer for a few minutes before
attempting calibration
Maintenance - pH calibration
Please pay attention to the buffer used during
calibration. Place the electrode in the buffer for 1
minute before subsequent operations. After
rinsing the electrode, only use a soft tissue to
absorb the water.
14. Digital pH/ORP sensor wiring definition
instructions
Please check the color and wiring definition carefully
before wiring. If wiring is wrong, the sensor may be
damaged.
Sensor power supply
Working current
communication interface
communication format
baud rate
communication protocol
Wiring definition
12VDC
25mA
RS485
N 8 1
9600
Modbus-RTU
Color
Red
Black
Green
White
description
12V+
GND
485A
485B
► Do not rub the pH sensitive membrane