NBL-WQ-TSS-4A Online Suspended Solids Sensor for Water Quality Monitoring and Wastewater Treatment

NiuBoL NBL-WQ-TSS-4A online suspended solids sensor adopts 90° scattering light measurement principle, built-in infrared LED light source and optical fiber structure, supporting RS485 Modbus RTU protocol. Designed for water quality monitoring, wastewater treatment and industrial process control, with IP68 high protection and automatic temperature compensation. It is a reliable choice for system integrators to achieve water quality digitization.

Industrial-grade High-precision Real-time Monitoring: NiuBoL Online Suspended Solids (TSS) Sensor

Solving the pain points of drift and light interference in sewage monitoring — a stable choice built for system integrators.

• Infrared Scattering Technology: Effectively filters natural light interference, ensuring high accuracy even in low ranges.

• Standard Modbus Protocol: No secondary development required, seamless connection to various PLC, DCS and IoT platforms.

• IP68 Fully Sealed Design: Supports long-term submersible installation up to 20 meters underwater, long-term maintenance-free.

NBL-WQ-TSS-4A Online Suspended Solids Sensor Product Overview

In modern water treatment and environmental monitoring projects, the measurement accuracy of suspended solids (Total Suspended Solids, TSS) directly affects the success of process control. However, complex outdoor lighting environments, rapidly changing water temperatures, and harsh corrosive media often cause ordinary sensors to drift or be frequently damaged.

NiuBoL NBL-WQ-TSS-4A is an integrated online suspended solids sensor specially designed for harsh industrial and environmental conditions. It adopts advanced backscattering light principle combined with optical fiber structure, which not only performs excellently in measurement stability but is also deeply optimized in ease of integration and durability. As a core member of the NiuBoL sensor family, it aims to provide environmental engineering contractors and water plant system integrators with a cost-effective, industrial-grade digital water quality sensing solution.

Core Technical Advantages

1. Optical Fiber Scattering Principle
   NBL-WQ-TSS-4A abandons traditional transmission light design and adopts the 90° scattering light measurement method. The infrared LED light source emits a beam that scatters when encountering suspended particles in the water sample. The sensor captures the backscattered light intensity through a precision optical fiber structure. This structure greatly enhances the sensor’s resistance to external light interference, maintaining extremely high reading stability even in brightly lit outdoor open channels.

2. Excellent Industrial-grade Protection and Materials
   The sensor housing combines POM (polyoxymethylene) and ABS engineering plastics. This material combination not only has strong chemical stability and resists corrosion from most acid and alkali media, but also offers high mechanical strength. Combined with IP68 waterproof encapsulation, the sensor can operate stably for a long time at depths up to 20 meters underwater, unaffected by humidity, deep water pressure and corrosive environments.

3. Precise Automatic Temperature Compensation
   Changes in water temperature affect the refractive index of liquids and the performance of electronic components. The sensor integrates a high-precision Pt1000 temperature sensor to collect medium temperature in real time and perform algorithm-level compensation. This design ensures that the output suspended solids value remains linearly consistent within the operating range of 0°C to 50°C.

4. Open and Convenient Integration Solution
   To meet the needs of Industrial Internet of Things (IIoT), the sensor comes standard with RS-485 digital interface and strictly follows the Modbus RTU protocol. This allows technicians to easily connect it to configuration software, HMI or various cloud platforms. We also provide optional 4-20mA analog output to meet the access habits of traditional control systems, achieving true “plug and play”.

NBL-WQ-TSS-4A Online Suspended Solids Sensor Technical Specifications

Typical Application Scenarios

• Sewage treatment plants: Monitor sludge concentration in biochemical treatment tanks and effluent suspended solids to assist in optimizing aeration volume and chemical dosing.

• Surface water monitoring: Long-term online monitoring of rivers, lakes and landscape water bodies to track turbidity and suspended solids trends in real time.

• Industrial process water treatment: Circulating cooling water systems, coal washing water treatment and papermaking wastewater discharge monitoring to protect subsequent water treatment equipment performance.

• Secondary water supply and tap water monitoring: Monitor pipeline network water quality stability to ensure terminal water supply meets environmental standards.

Installation and Electrical Connection Guide

Physical Installation Recommendations

• Spacing requirements: Keep the sensor at least 5cm away from the pool wall or pipe inner wall and at least 10cm from the bottom to avoid boundary effect interference.

• Bubble avoidance: Ensure the measurement window is fully submerged and no bubbles accumulate in front of the window.

Electrical Wiring Definition

The sensor uses a 5-core twisted shielded cable. Please follow the sequence strictly and verify before powering on:

• Red wire: Power positive (12～24VDC)

• Black wire: Power ground (GND)

• Blue wire: RS-485 A

• White wire: RS-485 B

• Yellow wire: 4-20mA current output (optional, insulate and leave floating if not used)

FAQ

Q1. What is the measurement principle of the NiuBoL suspended solids sensor?

It adopts the 90° scattering light principle. Infrared LED light illuminates suspended particles to produce scattering. The concentration in mg/L is obtained by measuring scattering light intensity and linearization calculation.

Q2. Why does the sensor need a built-in temperature sensor?

Water temperature changes slightly affect the optical lens and detection circuit. The built-in temperature sensor performs real-time automatic temperature compensation through algorithms to ensure reading consistency across different seasons and water temperatures.

Q3. Can the sensor be used in high-salinity seawater?

The housing uses POM and ABS materials with good corrosion resistance. In highly corrosive seawater, it is recommended to check the measurement window regularly and strengthen waterproofing on all connectors.

Q4. Does the sensor require frequent calibration?

It is recommended to follow local environmental protection authority requirements. In general industrial environments, due to the use of high-stability infrared light source, the calibration cycle can be as long as 3-6 months.

Q5. What causes large fluctuations in measurement data?

Please check the installation position: 1) whether a large number of bubbles are generated in front of the measurement window; 2) whether the sensor is too close to the pool wall causing reflection interference; 3) whether the cable shielding layer is properly grounded.

Q6. How to clean the sensor measurement window?

Use tap water to rinse or gently wipe with a damp soft cloth. Do not use metal brushes or sharp objects to avoid scratching the optical lens surface.

Q7. Does NiuBoL provide supporting secondary instruments?

Yes. NiuBoL sensors support standard Modbus RTU protocol and can be paired with our NBL-Display series instruments or directly connected to the customer’s existing PLC system.

Q8. Can the cable be extended to 100 meters?

RS-485 theoretically supports transmission over 1000 meters. For long-distance transmission, ensure the supply voltage at the sensor end remains above 12V and use high-quality shielded twisted pair cable to prevent interference.

Summary

NiuBoL NBL-WQ-TSS-4A online suspended solids sensor has become an efficient productivity tool in the water environment monitoring field with its excellent industrial design, stable optical structure and precise digital output. We understand system integrators’ demand for “stability” and “simplicity”, so every sensor undergoes 72-hour aging and stability testing before leaving the factory.

Are you looking for a water quality monitoring solution that can reduce operation and maintenance costs and improve project acceptance rates? Contact us immediately to obtain the complete NiuBoL water quality monitoring technical manual and bulk purchase discount plans. We look forward to working with you to build a smarter and clearer digital future.

NBL-WQ-TSS-4A Online Suspended Solids Sensor Data Sheet

NBL-WQ-TSS-4A Online Suspended Solids Sensor.pdf