RS485 Sludge Sensor / Sludge Concentration Sensor

This industrial RS485 sludge sensor adopts the optical turbidity / infrared scattering measurement principle, with integrated digital signal processing, built-in temperature compensation and IP68 waterproof structure. It provides standard RS485 (Modbus-RTU) digital output, featuring high stability, anti-fouling, strong anti-interference and fast response. It is widely used in sewage treatment plants, sludge thickening tanks, sedimentation tanks, industrial wastewater and aquaculture systems, and can be seamlessly connected with PLC, DCS and MTW series controllers.

Industrial Self-cleaning RS485 Sludge Sensor for Wastewater Treatment001

This RS485 sludge concentration sensor is an intelligent online monitoring probe designed for measuring sludge concentration, turbidity and suspended solids (SS) in wastewater and sludge systems. It uses the infrared optical scattering (860nm / 880nm) measurement principle, which is not affected by color and can accurately measure high-concentration sludge and suspended solids. The optical window is made of high-strength sapphire or tempered glass with a self-cleaning wiper / anti-fouling coating option, effectively reducing contamination and extending maintenance intervals.

Built-in temperature sensor realizes automatic temperature compensation, correcting measurement drift caused by temperature changes. The whole machine adopts digital signal conditioning and electrical isolation design, with strong anti-electromagnetic interference ability, supporting stable long-distance data transmission via RS485 Modbus-RTU. The probe housing is made of corrosion-resistant PPS/PEEK engineering plastic and 316L stainless steel, suitable for long-term submerged installation in harsh wastewater environments.

It supports standard calibration (standard solution or field comparison), with calibration data power-off storage and fault self-diagnosis functions. The sensor has a wide measuring range, covering low-turbidity clean water to high-concentration sludge, and is suitable for various working conditions such as biochemical tanks, sludge discharge pipes and thickeners.

Sensor Technical Parameters

Function	Universal Secondary Instrument pH, mg/L, NTU, μS/cm, mS/cm, ppm, ppb, cells, null, mm/a, etc.
Measurement Range	Depends on the sensor
Measurement Resolution	0.1, 0.01
Measurement Accuracy	±5% F.S.
Temperature Compensation	Reads sensor data
Temperature Range	0.0 to +50.0°C
Temperature Resolution	0.1°C
Temperature Accuracy	±0.2°C
Operating Temperature	0 to +70°C
Storage Temperature	-20 to +70°C
Display	Large backlit dot-matrix LCD
Current Output (Measured)	Isolated 4–20mA, max load 500Ω
Current Output (Temperature)	Isolated 4–20mA, max load 500Ω
Current Output Accuracy	±0.05mA
RS485	Modbus RTU standard protocol
Communication Rate	9600/19200/38400/115200
Relay Contact Capacity	5A/250VAC, 5A/30VDC
Timer Control Relay (Optional)	Cleaning
Relay Delay Action	0–120 seconds
Protection Level	IP65
Power Supply	90–260VAC, power <5W
Mounting Method	Panel mounting
Weight	144 series: 0.85 kg

Technical Specifications

Parameter	Range
Measurement Range	0–10,000 mg/L, 0–20,000 mg/L, 0–30,000 mg/L, 0–50,000 mg/L (value × 0.001 = g/L)
Temperature Range	0.0–80.0°C (optional temperature compensation)
Housing Material	Stainless steel
Mounting Method	Threaded fixation
Signal Cable Length	5 m (customizable)
Accuracy	±5.0% F.S.
Power Supply	12V
Protection Level	IP68
Pressure Resistance	0–4 bar
Output	4–20mA (max load 750Ω), RS485/MODBUS-RTU

Product Features

High-precision measurement strong anti-interference ability and accurate data.Real-Time Monitoring 24/7 continuous detection with rapid feedback on concentration changes, supporting automated control.