Suspended Solids / Sludge Concentration Sensor
The Suspended Solids / Sludge Concentration Sensor is designed for continuous online measurement of suspended solids (SS) and sludge concentration (MLSS) in water and wastewater treatment processes.
Based on ISO 7027 infrared scattered light technology, the sensor effectively eliminates the influence of sample color and provides stable, repeatable, and reliable measurement results. It is widely used in municipal and industrial wastewater treatment plants, process water systems, and environmental monitoring applications.
Transmitters & Sensors Description
Suspended Solids Sludge Sensor Key Features & Advantages
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ISO 7027 Standard Method
Uses infrared scattered light technology to minimize color interference and ensure measurement consistency. -
Dual-Beam Infrared Scattering Detection
Improves accuracy, repeatability, and long-term stability. -
High Measurement Reliability
Excellent repeatability and stability, suitable for continuous online monitoring. -
Built-in Self-Diagnostic Function
Automatically monitors sensor status to ensure reliable and accurate data output. -
Optional Automatic Cleaning Scraper
Reduces fouling and maintenance frequency, especially in high-solids applications. -
RS485 Communication
Supports connection to upper-level systems such as PLC, SCADA, or data acquisition units.
Suspended Solids Sludge Sensor Typical Applications
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Municipal wastewater treatment plants
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Industrial wastewater treatment
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Activated sludge process monitoring (MLSS)
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Sedimentation tanks and aeration basins
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Environmental water monitoring
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Process water systems with suspended solids
Transmitters & Sensors Parameter
| Parameter | Specification |
|---|---|
| Measurement Range | 0.01 – 45,000 mg/L / 0.01 – 120,000 mg/L |
| Temperature Range | 0 – 45 °C |
| Pressure Range | ≤ 0.4 MPa |
| Measurement Accuracy | ±5% FS |
| Flow Velocity | ≤ 2.5 m/s |
| Output Signal | RS485 |
| Housing Material | 316L Stainless Steel + PVC |
| Protection Class | IP68 |
| Dimensions | Ø60 × 256 mm |
| Installation Method | Submersible |
| Ambient Temperature | 0 – 60 °C |
| Ambient Humidity | < 90% RH |
| Signal Cable | 10 m standard, customizable up to 100 m |
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What is the difference between SS and MLSS measurement in wastewater treatment?
SS (Suspended Solids) generally refers to solids in water or effluent, while MLSS (Mixed Liquor Suspended Solids) is specific to activated sludge concentration in aeration tanks. This sensor supports both applications by measuring suspended solids using infrared scattering technology.
What factors most commonly affect the accuracy of online sludge concentration measurement?
Accuracy can be affected by sludge particle size, air bubbles, flow turbulence, sensor fouling, and improper installation depth. Proper installation and routine cleaning significantly reduce these effects.
How often does the SS / MLSS sensor require maintenance?
Maintenance frequency depends on sludge characteristics. In most wastewater plants, cleaning every 1–4 weeks is recommended. The optional automatic cleaning scraper can greatly extend maintenance intervals.
Can the sensor be used in high-concentration sludge environments?
Yes. The sensor supports measurement ranges up to 120,000 mg/L, making it suitable for high-concentration sludge zones such as aeration tanks, return sludge lines, and thickening processes.
How does ISO 7027 technology reduce measurement errors?
SO 7027 infrared scattered light technology minimizes the influence of sample color and ambient light, ensuring consistent and reliable sludge concentration measurement even in dark or colored wastewater.
What is the recommended installation method for stable online measurement?
Submersible installation in areas with stable flow and representative sludge mixing is recommended. Avoid installation near aerators, in dead zones, or areas with excessive turbulence to ensure accurate and stable readings.
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