The online turbidity sensor for water quality is designed specifically for monitoring suspended particulate matter in water bodies. It adopts the principle of optical scattering and accurately measures the scattering intensity of light by particles in the water sample, reflecting real-time changes in turbidity. The sensor has self-cleaning function and anti pollution structure, which can effectively deal with high turbidity and impurity water bodies, and adapt to scenarios such as drinking water treatment, sewage treatment, and industrial process monitoring. Its output signal is stable, supporting remote transmission and data integration, helping users to timely grasp water quality dynamics, optimize treatment processes, and ensure water safety and production efficiency.
Online turbidity sensor for water qualitySpecially designed for monitoring suspended particulate matter in water bodies, using the principle of optical scattering to accurately measure the scattering intensity of light by particles in water samples and reflect real-time changes in turbidity. The sensor has self-cleaning function and anti pollution structure, which can effectively deal with high turbidity and impurity water bodies, and adapt to scenarios such as drinking water treatment, sewage treatment, and industrial process monitoring. Its output signal is stable, supporting remote transmission and data integration, helping users to timely grasp water quality dynamics, optimize treatment processes, and ensure water safety and production efficiency.

1、 Working principle
Online turbidity sensor for water qualityDetermine the concentration of particles in a liquid by measuring the scattering of light. It uses a light source to illuminate the liquid and then measures the scattered light intensity at different angles. This sensor adopts the 90 ° angle scattered light method, linearly processes the collected values, and outputs turbidity values through temperature compensation algorithm.
2、 Technical parameters
| Measuring principle |
scattered light method |
| measurement range |
Default 0-3000NTU, 0-40NTU, 0-1000NTU can be customized |
| resolution |
0.1NTU |
| precision |
±1% , ±0.3℃ |
| temperature compensation |
Automatic temperature compensation |
| output method |
RS-485(Modbus/RTU) |
| Storage temperature |
-5-+65℃ |
| working environment |
0~50℃ , ≤0.2MPa |
| Installation method |
Immersion installation, 3/4NPT installation thread |
| Cable length |
5m |
| power consumption |
0.2W, 12V power supply |
| power supply |
DC:12V-24V |
| Protection level |
IP68 |
| calibration method |
Two-point calibration |
| Shell material |
ABS |
3、 Size/Installation
1. Dimensional drawing

2. Wiring diagram
The cable is a 5-core shielded wire:
Red wire - power wire, black wire - ground wire, green wire -485A, white wire -485B
3. Installation

Attention: The sensor should not be installed upside down or horizontally, and should be installed at an angle of at least 15 degrees. The test port will not touch the container wall within 5CM on both sides, and 10CM below
4、 Maintenance and upkeep
Sensor maintenance:
If the sensor needs to be cleaned, warm water and an appropriate amount of detergent can be used for cleaning.
Note:
Avoid strong vibrations that can damage the transparent glass in front of the ring, and do not scratch it with hard objects.
5、 User calibration
The sensor has undergone rigorous calibration before leaving the factory and generally does not require user calibration. If user calibration is performed, the command to restore the factory can be executed.
5.1 Zero point calibration
Place the sensor in a non transparent container and use distilled or purified water as the solution. Ensure that the sensor's testing port does not touch the container wall within 5CM on both sides and 10CM below. After 30 seconds of stable values, perform zero calibration according to communication instructions.
5.2 Slope calibration
Place the sensor in a non transparent container and use a solution with known turbidity (turbidity value should be greater than 20% of the range) to ensure that the sensor's testing port does not touch the container wall within 5CM on both sides and 10CM below. After 30 seconds of stable value, perform slope calibration according to communication instructions.