Optical Sludge Concentration Sensor is an infrared scattering optical probe designed for continuous online measurement of sludge concentration and Mixed Liquor Suspended Solids (MLSS) in wastewater systems.

Based on internationally recognized infrared scattering principle, it accurately detects suspended particles in sludge water and directly converts optical signal into sludge concentration value, with high accuracy and excellent repeatability. Built-in Pt1000 temperature sensor provides automatic temperature compensation, effectively reducing measurement deviation caused by water temperature changes.

Standard RS485 Modbus RTU digital communication enables convenient connection with transmitters, PLC and industrial control systems. Optional self-cleaning wiper prevents sludge fouling on optical window, lowering maintenance frequency in high-concentration sludge environment.

The sensor body adopts IP68 fully sealed anti-corrosion structure, supporting long-term submerged installation in aeration tank, secondary settling tank and sludge thickening tank.

Widely used in activated sludge aeration tank, secondary settling tank, sludge thickening tank, sludge return system, sludge dewatering process and industrial wastewater treatment.

Optical Sludge Concentration Sensor is an in-line optical probe for continuous online measurement of sludge concentration in water treatment. It adopts the infrared light scattering principle to detect the concentration of suspended solids directly in the liquid without sampling. Built-in temperature compensation and anti-fouling optical window ensure stable and accurate readings. With IP68 waterproof housing and RS485 Modbus-RTU digital output, it easily connects with transmitters, PLC and IoT platforms for automated sludge management.

Key Advantages

1.Optical measurement principle, no sampling or chemical reagents required
2.Infrared scattered light detection, strong anti-bubble and anti-color interference
3.Anti-fouling optical window, reduce scaling and adhesion, long service life
4.IP68 fully sealed probe, suitable for long-term underwater immersion
5.Built-in temperature compensation, stable measurement data
6.Compact structure, easy installation and on-site calibration

Sensor Technical Parameters

Function	Universal Secondary Instrument
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 pH, mg/L, NTU, μS/cm, mS/cm, ppm, ppb, cells, null, mm/a, etc.

Sensor Technical Parameters

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

Application Fields

Municipal wastewater treatment: aeration tank, secondary sedimentation tank, sludge thickener
Industrial wastewater activated sludge process
Sludge dewatering and concentration monitoring
River, lake and reservoir suspended solids monitoring
Aquaculture water quality monitoring