NBL-TSS-408-S Suspended Solids Sensor by Scattered Light Method: For Wastewater Treatment, Water Body Monitoring, RS-485

NBL-TSS-408-S Online Suspended Solids Sensor: Stable and Reliable Industrial-grade TSS Online Monitoring Solution

In wastewater treatment, industrial wastewater treatment and environmental water body monitoring projects, fluctuations in suspended solids concentration often lead to process loss of control, excessive discharge and equipment blockage. The NiuBoL NBL-TSS-408-S online suspended solids sensor is based on the scattered light method principle. It emits a light beam through an infrared LED light source, measures the backscattered light intensity generated by suspended particles in water, and outputs accurate TSS concentration values in real time after linearization processing. The sensor is easy to install and maintain, with strong anti-interference capability. It is particularly suitable for system integrators and engineering contractors to build highly reliable online water quality monitoring systems, effectively solving the industry pain points of lag in traditional manual sampling, weak anti-interference and complex integration.

Core Advantages

• High Stability and Anti-Interference: Infrared LED light source combined with optical fiber structure effectively resists external light interference, with built-in temperature sensor, small drift and stable long-term operation.

• High Precision and Wide Range: Measurement range 0～2000 mg/L, resolution 0.1 mg/L, fast response, suitable for various scenarios from low-concentration surface water to high-concentration sludge.

• Easy Integration and Reliable Protection: Natively supports RS-485 Modbus/RTU protocol, optional 4-20 mA output, IP68 protection rating, supports 20-meter water depth immersion, 316L stainless steel material adapts to harsh industrial environments.

NBL-TSS-408-S Online Suspended Solids Sensor by Scattered Light Method Product Overview

The NiuBoL NBL-TSS-408-S online suspended solids sensor is an industrial-grade digital sensor developed for continuous online monitoring of total suspended solids (TSS) concentration in water bodies. Using the scattered light measurement principle, when the light beam enters the water sample, suspended particles produce scattering. By detecting the intensity of backscattered light and comparing it with internal calibration values, the final measurement value is output after linearization processing. The sensor requires no reagent consumption, has stable and reliable data output, and is widely suitable for engineering projects that require real-time control of suspended solids in water.

For system integrators, the NBL-TSS-408-S provides a standardized Modbus protocol interface that can be directly connected to existing PLC, DCS or IoT platforms to achieve seamless data collection and remote monitoring. For engineering contractors, it significantly reduces on-site wiring and later maintenance costs, ensuring that the monitoring system operates stably for a long time under complex water quality conditions. The product has undergone 72-hour aging testing and strict quality inspection, and has high reliability upon leaving the factory.

NBL-TSS-408-S Online Suspended Solids Sensor by Scattered Light Method Key Technical Advantages

1. Advanced Scattered Light Measurement Technology
   The sensor uses an infrared LED light source with high stability and long service life. The optical fiber structure design further enhances resistance to external light interference. The built-in temperature sensor works with Pt1000 automatic temperature compensation to ensure that measurement results are not affected by temperature fluctuations. The scattered light intensity has a corresponding relationship with suspended solids concentration, and high-precision data is output after linearization processing by internal algorithms.

2. Rugged and Durable Hardware Design
   - Wetted part material is 316L stainless steel, with excellent corrosion resistance, suitable for industrial wastewater, seawater and environments containing corrosive media.
   - Protection rating IP68, supports maximum 20-meter water depth immersion, and can work stably in harsh water bodies for a long time.
   - Installation interface is 3/4 NPT thread, submerged installation is convenient and flexible.
   - Standard 5-meter cable, supports customization of longer lengths to meet different on-site wiring requirements.

3. Intelligent Communication and Low Power Consumption Integration
   Supports RS-485 Modbus/RTU protocol, with stable and reliable communication, easy to seamlessly integrate with various host computer systems. Optional 4-20 mA analog output meets the needs of different control systems. Power consumption is only 0.2W@12V, and the low-energy design is particularly suitable for distributed or solar-powered remote monitoring stations.

4. Convenient Maintenance and Calibration
   Two-point calibration method (zero point + slope), simple operation. Zero point calibration uses zero suspended solution or known low-concentration solution, and slope calibration uses known high-concentration suspended solution. After the value stabilizes, calibration is completed through Modbus commands. The sensor front end should avoid air bubbles. The cleanliness of the measurement window directly affects reading accuracy. It is recommended to check and clean regularly.

These technical features enable the NBL-TSS-408-S to perform excellently in long-term unattended operation and significantly improve the engineering reliability of the entire water quality monitoring system.

NBL-TSS-408-S Online Suspended Solids Sensor Technical Specifications

Note: The sensor uses 5-core cable connection, and the wetted materials ensure corrosion resistance.

NBL-TSS-408-S Online Suspended Solids Sensor Application Scenarios

1. Municipal Wastewater Treatment Plant Inlet and Outlet Water Monitoring: Real-time control of suspended solids concentration in aeration tanks, sedimentation tanks and outlets to optimize process parameters and ensure compliant discharge.

2. Industrial Wastewater Treatment Systems: Suitable for wastewater treatment in chemical, papermaking, food, pharmaceutical and other industries to monitor changes in suspended solids, prevent pipeline blockage and equipment wear.

3. Surface Water and Drinking Water Source Monitoring: Used for online TSS monitoring in natural water bodies such as rivers, lakes and reservoirs to assist in environmental quality assessment and pollution early warning.

4. Sludge Treatment and Reuse Process: Monitoring suspended solids concentration during sludge thickening and dewatering to support process optimization and resource utilization.

5. Circulating Cooling Water and Industrial Process Water Monitoring: Timely detection of suspended solids accumulation in cooling systems to protect heat exchange equipment and improve system operation efficiency.

6. Port and Marine Environmental Monitoring: Combined with seawater corrosion resistance characteristics to monitor suspended solids in ballast water or nearshore water bodies to meet environmental protection regulatory requirements.

In these application scenarios, the sensor’s high stability and Modbus protocol integration capability help users build efficient and intelligent water quality monitoring networks.

Installation and Wiring Guide

During installation, adopt submerged installation with 3/4 NPT interface. Ensure the sensor is at least 5cm away from the side wall and at least 10cm away from the bottom to avoid wall or bottom reflection interference with measurement. Place the sensor vertically in the water body with the front end kept clean and free of air bubbles.

Electrical Connection: Use 5-core cable with the following wiring definition:

• Red wire: Power positive (12～24V DC)

• Black wire: Ground (GND)

• Blue wire: RS-485 A

• White wire: RS-485 B

After wiring, please carefully check the sequence to avoid incorrect powering on. All wiring points must undergo waterproof treatment. User cables should have certain corrosion resistance. During normal operation, the cable should not be tensioned to prevent internal breakage.

FAQ

Q1: Is the NBL-TSS-408-S suitable for seawater or high-salinity water bodies?

A: Yes. The sensor wetted part uses 316L stainless steel material with IP68 protection rating, featuring good corrosion resistance, and is suitable for seawater, ports and high-salinity industrial wastewater environments.

Q2: How to perform two-point calibration of the sensor?

A: Zero point calibration uses zero suspended solution or known low-concentration solution (0～200 mg/L), and slope calibration uses known high-concentration suspended solution (200～2000 mg/L). Keep the sensor front end at least 10cm from the bottom of the beaker. After the value stabilizes for 1 minute, complete calibration through Modbus commands. Pay attention to avoid air bubbles at the front end.

Q3: What host computer systems does the sensor support for integration?

A: Fully supports RS-485 Modbus/RTU protocol and can be directly connected to PLC, DCS, SCADA and various IoT platforms to achieve real-time data acquisition and remote monitoring. Optional 4-20 mA output meets the needs of analog systems.

Q4: How does dirty measurement window affect readings?

A: The cleanliness of the measurement window is critical to accuracy. It is recommended to regularly clean the outer surface with tap water. Stubborn dirt can be wiped with a soft cloth dipped in household detergent. Keeping the window clean can maintain long-term measurement stability.

Q5: Will external light interfere with measurement results?

A: No. The optical fiber structure design significantly improves resistance to external light interference. The infrared LED light source combined with algorithms ensures stable and reliable data under indoor/outdoor and different lighting conditions.

Q6: Can the sensor response speed meet dynamic process control requirements?

A: Yes. The sensor adopts the scattered light method with rapid response and can reflect changes in suspended solids concentration in real time, suitable for wastewater treatment and process control scenarios that require quick feedback.

Q7: What about the product warranty and after-sales?

A: One-year warranty service is provided from the date of sale (excluding improper use). If there are connection problems or cable failures, please contact the NiuBoL technical support team in time. We will provide professional guidance.

Q8: Can the minimum resolution and accuracy meet low-concentration water body monitoring?

A: Resolution reaches 0.1 mg/L. Within the 0～2000 mg/L range, accuracy is ±5% (depending on sludge uniformity), covering multiple monitoring needs from low-concentration drinking water sources to high-concentration industrial sludge.

Summary and Cooperation Invitation

The NiuBoL NBL-TSS-408-S online suspended solids sensor provides a professional, stable and easy-to-integrate solution for industrial water quality TSS monitoring with scattered light method as the core, relying on infrared LED light source, optical fiber structure anti-interference design, robust 316L stainless steel material and standardized Modbus communication protocol. It not only improves the accuracy and real-time performance of monitoring data but also helps engineering projects effectively control operation and maintenance costs and enhance overall system reliability.

If you are planning wastewater treatment upgrades, environmental online monitoring platforms or industrial process water quality control projects, please feel free to contact the NiuBoL technical team. We will provide detailed technical parameter support, integration solution consultation, on-site installation guidance and stable supply assurance to jointly build an efficient and reliable industrial IoT water quality monitoring system.

NBL-TSS-408-S Water Quality Suspended Solids Sensor Data Sheet

NBL-TSS-408-S Suspended Solids Sensor.pdf