Online Water Quality Turbidity Sensor Selection and System Integration Guide: Application of NBL-WQ-TS in Industrial Water Quality Monitoring

I. Project Background and Industrial Application Requirements

In water quality online monitoring projects, turbidity is an important indicator for judging changes in suspended particles, colloidal substances, sediment, organic matter, microorganisms and other insoluble impurities in water bodies. For system integrators, environmental engineering companies, smart water platform providers and industrial automation contractors, turbidity monitoring is not a single instrument procurement issue, but an important component of whether the entire water quality monitoring system can operate stably, whether data can be connected to the platform, and whether on-site maintenance is controllable.

In actual engineering projects, online turbidity sensors are typically used for the following requirements:

• Monitor turbidity changes in raw water, process water, and discharge water;

• Determine the treatment effect of sedimentation, filtration, flocculation and other process links;

• Provide continuous data for PLC, RTU, SCADA or cloud platforms;

• Trigger alarms, linkage control or operation and maintenance response in case of abnormal water quality;

• Form a multi-parameter water quality monitoring system in conjunction with pH, dissolved oxygen, conductivity, ORP, ammonia nitrogen and other sensors.

For B-end procurement personnel, when selecting turbidity sensors, attention should not only be paid to range and accuracy, but also to communication protocol, power supply mode, installation method, protection rating, long-term stability, maintenance cycle and system compatibility.

NiuBoL NBL-WQ-TS integrated online turbidity sensor adopts the 90-degree scattered light measurement principle, supports RS485 interface and Modbus RTU protocol, and is suitable for project integration needs such as industrial water quality turbidity monitoring sensors, smart water turbidity sensors and online water quality monitoring turbidity sensors.

II. Basic Concept and Engineering Significance of Turbidity

Turbidity is the optical characterization of water transparency. When sand, clay, plankton, organic debris, colloidal particles or microorganisms exist in water, incident light will be scattered or absorbed by particles, causing the water sample to appear cloudy to varying degrees.

It should be noted that turbidity is not equivalent to suspended solids concentration. Suspended solids concentration usually represents the mass of solid particles per unit volume of water sample, while turbidity reflects the scattering effect of particles on light. The number, particle size, shape, color and refractive index of particles will all affect turbidity readings.

In engineering applications, turbidity is often used for the following judgments:

• Whether the water treatment process is stable;

• Whether the filtration system has breakthrough or blockage;

• Whether rivers, lakes and reservoirs are affected by sediment or pollution;

• Whether suspended solids in aquaculture water bodies are too high;

• Whether there is abnormal particle input in industrial circulating water or drainage systems.

The common turbidity unit is NTU, namely Nephelometric Turbidity Unit, usually called scattered turbidity unit in Chinese.

III. Product Position in the System

In a complete water quality monitoring system, NiuBoL NBL-WQ-TS online turbidity sensor is located at the on-site sensing layer, responsible for collecting turbidity and temperature data in the water body, and uploading it to the upper system through RS485 Modbus RTU interface.

Typical system structure is as follows:

On-site water body → NBL-WQ-TS online turbidity sensor → RS485 / Modbus RTU → PLC, RTU, data collector or industrial gateway → 4G, Ethernet, LoRa or fiber optic network → SCADA system, cloud platform or smart water management platform → Data display, alarm linkage, report analysis, remote operation and maintenance

In system integration projects, the sensor can be used as an independent turbidity measurement unit or combined with other water quality sensors to form a multi-parameter monitoring station. For example:

• pH + Turbidity + Conductivity for conventional water quality online monitoring;

• Turbidity + Suspended solids + Liquid level for discharge outlets or sewage treatment stations;

• Turbidity + Dissolved oxygen + Temperature for aquaculture;

• Turbidity + Rainfall + Water level for river channels and hydrological monitoring.

IV. Communication and Protocol Compatibility

For engineering projects, whether the sensor can be easily connected to the existing system often directly affects the project implementation cycle and debugging costs.

NiuBoL NBL-WQ-TS supports RS485 communication interface and Modbus RTU protocol, suitable for accessing various industrial control and IoT systems.

1. RS485 Interface Advantages

RS485 is a commonly used digital communication interface in industrial sites, suitable for water quality monitoring, environmental monitoring, automation control and remote acquisition projects. Its main engineering advantages include:

• Supports longer distance communication;

• Strong anti-interference ability;

• Can realize multi-device bus connection;

• Suitable for on-site wiring and centralized acquisition;

• Compatible with most PLCs, RTUs and industrial gateways.

2. Modbus RTU Protocol Compatibility

Modbus RTU is a widely used communication protocol in the field of industrial automation. For system integrators, using Modbus RTU protocol can reduce secondary development difficulty.

V. Turbidity Sensor Working Principle

NiuBoL NBL-WQ-TS integrated online turbidity sensor adopts the scattered light turbidity measurement method. When a light beam enters the water sample, particles in the water will cause the light to scatter. The sensor detects the intensity of scattered light at a 90-degree position from the incident light direction, compares it with the internal calibration value, and after linearization processing, finally outputs the turbidity value.

The 90-degree scattered light measurement method is suitable for low and medium-low turbidity water body monitoring and has good engineering applicability in drinking water, surface water, environmental water bodies and process water monitoring.

VI. NBL-WQ-TS Integrated Online Turbidity Sensor Technical Parameters

VII. Key Engineering Features

7.1 90-degree scattered light measurement, suitable for online monitoring

7.2 RS485 Modbus RTU output, convenient for system integration

7.3 IP68 protection, supports submersible installation

7.4 Automatic temperature compensation, improves data stability

7.5 Low power consumption design, suitable for remote monitoring stations

VIII. Systematic Application Scenarios of Turbidity Sensors

1. Sewage Treatment Water Quality Monitoring

Turbidity data can be used to judge sedimentation, filtration and effluent stability...

2. Drinking Water Treatment Process Control

In water plants and water supply projects, turbidity is an important indicator...

3. Aquaculture Water Quality Monitoring

In pond farming, factory farming and recirculating aquaculture systems...

4. River and Lake Water Environment Monitoring

River, lake, reservoir and wetland monitoring projects usually require long-term continuous collection of water quality data.

IX. Turbidity Sensor Selection Guide

X. System Integration Precautions

1. Installation point should be representative

2. Avoid bubble interference

3. Pay attention to cable stress protection

4. Pay attention to optical window cleaning

5. Do good grounding and anti-interference

6. Establish calibration and data verification mechanism

FAQ

Q1: What does the online turbidity sensor measure?

A: It measures the degree of light scattering by particles in the water body, not the suspended solids mass concentration directly.

Q2: What are the advantages of the 90-degree scattered light method?

A: It calculates turbidity by detecting scattered light intensity in the direction perpendicular to the incident light, suitable for online water quality monitoring, especially low and medium-low turbidity water bodies.

Q3: Can turbidity and suspended solids concentration be directly converted?

A: Generally not. Turbidity is affected by particle number, size, shape, color and refractive index, while suspended solids concentration is mass concentration. There is no fixed proportional relationship between the two.

Q4: Which range should be selected for drinking water projects?

A: For drinking water, filtered water and low turbidity water bodies, the 0～20 NTU range is usually recommended.

Q5: Which range should be selected for sewage treatment projects?

A: For sewage treatment, discharge outlets and high suspended solids scenarios, the 0～1000 NTU range is usually recommended.

Q6: Is RS485 Modbus RTU suitable for smart water projects?

A: Yes. It is convenient to connect to PLC, RTU, data collectors and industrial gateways.

Q7: Is NBL-WQ-TS suitable for unattended monitoring stations?

A: Yes. Low power consumption and IP68 protection make it suitable for remote stations.

Q8: Can the cable length be customized?

A: Yes. Standard is 5 meters, other lengths can be customized.

Q9: Can it form a multi-parameter system with other water quality sensors?

A: Yes. It can be combined with pH, conductivity, dissolved oxygen, ORP, ammonia nitrogen, etc.

Q10: What information should be confirmed during project procurement?

A: Range, accuracy, power supply voltage, communication protocol, installation method, cable length, protection rating, on-site water depth, maintenance conditions and upper system interface requirements.

Summary

For water quality monitoring system integrators, IoT solution providers, environmental engineering contractors and industrial procurement personnel, the core value of online turbidity sensors is not only single-point measurement, but whether they can be stably connected to the entire monitoring system and provide usable, traceable and scalable data during long-term operation.

NiuBoL NBL-WQ-TS online turbidity sensor adopts the 90-degree scattered light measurement principle, supports RS485 Modbus RTU communication, and has IP68 protection, automatic temperature compensation, low power consumption and submersible installation capabilities. Its parameter configuration is suitable for drinking water treatment, sewage treatment, aquaculture, river and lake environment monitoring, industrial process water and smart water IoT projects.

Water Quality Sensor Data Sheet

NBL-WQ-CL Water Quality Sensor Online Residual Chlorine Sensor.pdf    

NBL-WQ-DO Online Fluorescence Dissolved Oxygen Sensor.pdf    

NBL-WQ-NHN Ammonia Nitrogen Water Quality Sensor.pdf    

NBL-WQ-COD Online Water Quality COD Sensor.pdf    

NBL-WQ-PH Online pH Water Quality Sensor.pdf    

NBL-WQ-EC water quality conductivity sensor.pdf    

NBL-WQ-BOD-4A Online BOD Sensor.pdf    

NBL-WQ-TS Online Turbidity Water Quality Sensor.pdf

NBL-WQ-TS-4A Water Quality Turbidity Sensor.pdf

NBL-WQ-TS-4S online turbidity sensor.pdf