Level & Interface SensorsTL-SL Series
Sludge Level Sensor
Level & Interface Sensors
Sludge Level Sensor
TL-SL Series
Ultrasonic/optical sludge-water interface sensor. Range 0–10 m, IP68, RS485 + 4-20mA output.
Request a QuoteProduct Overview
The TL-SL Series uses ultrasonic or optical methods to detect the sludge-water interface level in clarifiers and sedimentation tanks. Provides real-time sludge blanket depth data for automated sludge withdrawal control.
Working Principle
The sensor uses a continuous online measurement principle with automatic temperature compensation. The measurement signal is processed by an integrated microprocessor and transmitted via RS485 Modbus RTU for direct integration with PLCs, data loggers, and SCADA systems. The 4–20 mA analog output provides compatibility with legacy control systems.
Wiring & Signal Output
Power supply: 12–24 V DC (standard); 220 V AC with adapter
Primary output: RS485 Modbus RTU (address configurable 1–247)
Analog output: 4–20 mA (proportional to measured value)
Relay output: 2 × SPDT relay for alarm / dosing control
Communication: Modbus RTU function codes 03 / 06 / 16
Cable entry: M16 cable gland, IP68 submersible cable available
Technical Specifications
| Parameter | Value |
|---|---|
| Measurement Principle | Ultrasonic / optical |
| Measuring Range | 0–10 m |
| Accuracy | ±5 cm |
| Temperature Range | 0–50°C |
| Signal Output | RS485 Modbus RTU + 4-20mA |
| Power Supply | 12–24 VDC |
| Protection | IP68 |
| Material | SS316L |
Key Features
- Real-time sludge blanket depth measurement
- Enables automated sludge withdrawal control
- IP68 for continuous submersion
- RS485 + 4-20mA dual output
Typical Applications
Secondary clarifiersSedimentation tanksDissolved air flotation (DAF)Sludge thickeners
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