Specifications	Details
measurement range	Turbidity: 0.01-3000 NTU
measurement accuracy	Less than ± 5% of the measured value, or ± 0.5NTU, whichever is greater
repetitiveness	±3%
resolution	0.01NTU , 0.1NTU , Depending on the measurement range
pressure range	≤0.2Mpa
Main materials of sensors	Body: SUS316L; Upper and lower covers: PPS+fiberglass, cable: PUR
power supply	9~36VDC
communication protocol	MODBUS RS485
Storage temperature	-15 to 50 ℃
Operating Temperature	0 to 45 ℃ (non freezing)
weight	0.8KG
Protection level	IP68/NEMA6P
cable length	Standard 10 meter cable, extendable up to 100 meters

2.1 Product Information

The turbidity sensor is based on infrared scattering light technology, which means that the infrared light emitted by the light source will scatter when passing through the measured sample during transmission, and the intensity of the scattered light is proportional to the turbidity. The turbidity sensor is equipped with a scattered light receiver in the 90 ° direction, and the turbidity value is obtained by analyzing the intensity of this scattered light.
It can be widely used for online monitoring of turbidity at the inlet and sedimentation tank of water plants; Online monitoring of turbidity in sewage treatment plants, various industrial production processes, and wastewater treatment processes.

3.2 Sensor Connection

Sensors are correctly connected according to the following wire core definitions:

Core number	1	2	3	4	5
Sensor wires	red	black	blue	white	Yellow+Green
signal	+12VDC	AGND	RS485 A	RS485 B	ground wire

communication protocol

The sensor is equipped with MODBUS RS485 communication function. Please refer to section 3.2 of this manual for communication wiring. The specific MODBUS-RTU table is shown in the following table.

MODBUS-RTU
Baud rate				4800/9600/19200/38400
data bit				8 digits
parity check				none
stop bit				1 person
register name	Address location	read/write	data type		Number of registers	Instructions
Turbidity value	0	OR	Float		2	0-range
Turbidity factor	4	RW	Float		2	0.1-9.99
Turbidity deviation value	8	RW	Float		2	±80%FS NTU
Scratching time	11	OR	Int		1	Time interval for sending: (1-10080 units: min)
response time	12	RW	Int		1	3-60s
parameter	13	OR	Int		1	1 is turbidity, and 2 is suspended solids
Probe humidity	14	OR	Int		1	Suggest less than 10
Probe baud rate	16	RW	Int		1	0 represents 4800, 1 represents 9600 2 represents 19200 3 represents 38400
Probe slave address	17	RW	Int		1	1-200
Serial Number 1	61400	OR	Int		1	The first 4 digits of the serial number
Serial number 2	61401	OR	Int		1	Four digits in the serial number
Serial number 3	61402	OR	Int		1	The last 4 digits of the serial number
Manual scraping command	20	W	Int		1	Send 66
Automatic scraping command	21	W	Int		1	Time interval for sending: (1-10080 units: min)
Current AD channel	52	OR	Int		1
Average AD	56	OR	Int		1
Probe calibration
The first coefficient	60	RW	float		2
Second coefficient	62	RW	float		2
Calibration standard solution values (first and second points)	66	RW	float		2	For the first point, it is recommended to choose a standard solution within the range of 0.1-10NTU. For the second point, it is recommended to choose a standard solution within the range of 500-1000NTU
Dark value calibration	120	W	int		1	0: Start 1: Confirm

485analysis
1Read turbidity factor

register name	Address location	read/write	data type	Number of registers	Instructions
Turbidity factor	4	RW	Float	2	0.1-9.99

Send command: 01 03 00 04 00 02 85 CA
Equipment return: 01 03 04 00 00 40 E0 CA 7B
Send command parsing:
01: Equipment Address 01
03: Function code for reading register contents 03
00 04: The starting register address read is 0004
00 02: Read 2 registers
85 CA: CRC16 checksum
Device Return Analysis:
01: Equipment Address 01
03: Function code for reading register contents 03
04: The length of the returned data is 4 bytes
00 00 40 E0: The turbidity factor read is 7.00 (using IEEE 754 method to analyze 40 E0 00 00)
CA 7B: CRC16 checksum

2Read the scraping time

register name	Address location	read/write	data type	Number of registers	Instructions
Scratching time	11	OR	Int	1

Send command: 01 03 00 0B 00 01 F5 C8
Equipment return: 01 03 02 00 B8 44
Send command parsing:
01: Equipment Address 01
03: Function code for reading register contents 03
00 0B: The starting register address read is 0011
00 01: Read 1 register
F5 C8: CRC16 checksum
Device Return Analysis:
01: Equipment Address 01
03: Function code for reading register contents 03
02: The length of the returned data is 2 bytes
00 00: The read scraping time is 0
B8 44: CRC16 checksum

3Set manual scraping command

register name	Address location	read/write	data type	Number of registers	Instructions
Manual scraping command	20	W	Int	1	Send 66

Send command: 01 06 00 14 00 42 49 FF
Equipment return: 01 06 00 14 00 42 49 FF
Send command parsing:
01: Equipment Address 01
06: Function code for writing register contents 06
00 14: The register address for writing data is 0020
00 42: Write data content as 0066
49 FF: CRC16 checksum
Device Return Analysis:
01: Equipment Address 01
06: Function code for writing register contents 06
00 14: Return the register address for writing data as 0020
00 42: Return modified data content as 0066
49 FF: CRC16 checksum

4Set turbidity factor

register name	Address location	read/write	data type	Number of registers	Instructions
Turbidity factor	4	RW	Float	2	0.1-9.99

Send command: 01 10 00 04 00 02 04 00 3F 80 E2 0C
Equipment return: 01 10 00 04 00 02 00 09
Send command parsing:
01: Equipment Address 01
10: Function code 16 for writing register contents
00 04: The starting register address for writing data is 0004
00 02: Write data from 2 registers
04: Data length of 4 bytes
00 00 3F 80: The turbidity factor written is 1.00 (using IEEE 754 method to analyze 3F 80 00 00)
E2 0C: CRC16 checksum
Device Return Analysis:
01: Equipment Address 01
10: Function code 16 for writing register contents
00 04: Return the starting register address for writing data as 0004
00 02: Return 2 registers
00 09:CRC16 verification code