PSS200 Total Suspended Solids/ TSS/ MLSS Meter for Industrial/Environmental Wastewater Treatment
Introduction
The PSS200 is an online analyzer that measures suspended solids and sludge concentrations using an infrared absorption and scattered light method in accordance with the ISO 7027 standard. This method reduces the influence of color (chroma) and other interfering factors, enabling consistent and precise detection of suspended solids over a wide range.
Built for continuous operation, the meter combines robust construction with flexible communication and output options, enabling integration into automated control systems such as PLC, DCS, and SCADA. Its user-friendly interface and self-diagnostic capabilities help ensure that operators receive dependable real-time data with minimal maintenance effort.
Working principle
How Infrared Scattered Light Measurement Works
The PSS200 employs an optical sensing method based on infrared absorption and double-scattered light:
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Infrared Illumination: An infrared light source emits energy into the liquid medium, which interacts with suspended particles and sludge.
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Scattered Light Detection: Particles in the water scatter the infrared light in multiple directions. The meter’s optical sensor measures this scattered light intensity, which correlates with the concentration of suspended solids.
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Signal Processing: The detected optical signal is converted into an electrical output that represents the concentration of suspended solids. The system then communicates this value via analog or digital outputs for monitoring and control purposes.
By following the ISO 7027 methodology, the suspended solids meter minimizes interference from water color and provides stable, accurate data essential for process automation and water quality control.
Key features
The PSS200 Suspended Solids Meter is engineered to support demanding industrial environments with the following features:
- Infrared Scattered Light Sensing (ISO 7027): This turbidity sensor uses a standardized optical method that resists color interference, improving measurement accuracy.
- Wide Measurement Range: This PSS200 suspended solids meter is built to support a broad concentration span suitable for low and high solids conditions.
- Robust Construction: The durable housing with an IP65 protection rating ensures reliable operation in wet and industrial environments.
- Multi-Output Communication: It includes three-way analog 4–20 mA outputs, configurable relay outputs, and MODBUS RS485 digital communication for integration with automation systems.
- Clear Local Display: A 128×64 dot-matrix LCD with LED backlight provides real-time measurement readouts and status information.
- Flexible Power Supply: This meter works with AC (220 V) or DC (24 V) power sources, making it adaptable for a range of installations.
- Configurable Outputs: The analog outputs and relay contacts can be programmed for specific response parameters and thresholds.
- Self-Diagnosis and Ease of Use: Built-in diagnostic functions help maintain accuracy and simplify calibration and maintenance.
Specification
| Product | Suspended Solids(Sludge Concentration/ TSS/ MLSS) meter |
| Model | PSS200 |
| Main materials | lower casing: Aluminum with powder covering |
| cover: PA66+GF25+FR | |
| Waterproof rate | IP65 |
| Storage temperature | -20~70℃ |
| Operation Temperature | -15~60℃ |
| Output | Three-way analog output 4-20mA, response parameters, and corresponding scope can be programmedNote: the maximum load is 500 ohms |
| Relay | A three-way relay can be set up, and response parameters and response values can be programmed |
| Display | 128 * 64 dot matrix LCD with LED backlight |
| Digital Communication | MODBUS RS485 communication function, which can transmit real-time measurements |
| Power Supply | AC：AC220V, 50HZ, 5W DC：DC24V |
| Size | 145*125*162mm L*W*H |
| Weight | 1.3 KG |
Applications
The PSS200 Suspended Solids Meter is suitable for continuous Online monitoring and control across a variety of industrial and environmental applications:
• Wastewater Treatment Plants
Monitor TSS and MLSS levels to support biological treatment control and regulatory compliance.
• Industrial Effluent Monitoring
Measure suspended solids in discharge streams from chemical, food processing, pulp and paper, and other facilities.
• Municipal Water Quality
Track solids concentration in water supply systems, reservoirs, and distribution networks.
• Environmental Monitoring
Provide real-time data for surface water bodies, rivers, or lakes where solid concentration influences ecological health.
• Process Automation
Integrate with PLC/DCS/SCADA systems for automated control of mixers, clarifiers, and dosing systems to enhance operational stability and performance.
