YEX-ZS-406-S High-Precision Online Turbidity Sensor: The Ultimate Solution for Real-Time Water Quality Monitoring

In modern industrial and environmental management, monitoring water clarity is no longer just a regulatory requirement—it is a critical component of process efficiency and safety. The YEX-ZS-406-S Integrated Online Turbidity Sensor by Yexsensor is engineered to deliver laboratory-grade precision in the harshest field environments.

Utilizing advanced optical fiber technology and a robust self-cleaning mechanism, this sensor ensures long-term stability and minimal maintenance for critical water quality applications.

Cutting-Edge Measurement Technology: The 90° Scattered Light Principle

The YEX-ZS-406-S operates on the internationally recognized 90° scattered light measurement principle. When an infrared LED light source enters the water sample, it interacts with suspended particles. The sensor measures the intensity of light scattered at a right angle (90°) to the incident beam.

Why Optical Fiber Structure Matters

Unlike traditional turbidity meters, the YEX-ZS-406-S features an optical fiber structure. This design provides superior resistance to external light interference, ensuring that ambient sunlight or artificial lighting in open channels does not skew your data. The infrared LED light source further enhances stability, providing a consistent baseline even in fluctuating temperatures.

YEX-ZS-406-S High-Precision Online Turbidity Sensor Technical Parameters

YEX-ZS-406-S High-Precision Online Turbidity Sensor Key Features for Industrial Reliability

1. Integrated Self-Cleaning Brush
Biofouling and sediment buildup are the leading causes of sensor drift. The YEX-ZS-406-S comes equipped with an automatic cleaning brush that periodically sweeps the optical window. This significantly extends the calibration interval and ensures "set-and-forget" reliability in wastewater or aquaculture environments.

2. Dual Signal Output & Easy Integration
Equipped with RS-485 Modbus/RTU protocol support, this sensor can be seamlessly integrated into PLC, SCADA, or IoT cloud platforms. For legacy systems, an optional 4-20mA analog output is available, providing maximum flexibility for system integrators.

3. Rugged Construction for Harsh Conditions
With a body crafted from 316L stainless steel and high-grade ABS, the sensor is resistant to corrosion. Its IP68 rating allows for continuous submersion up to 20 meters, making it ideal for deep reservoir monitoring or pressurized pipe installations.

Diverse Application Scenarios

• Municipal Water Treatment: From monitoring the efficiency of filtration beds to ensuring the clarity of finished drinking water, the sensor provides the high resolution (0.01 NTU) required for regulatory compliance and public safety.

• Industrial Wastewater Discharge: Monitor effluent quality in real-time to prevent environmental fines. The 4000 NTU range is particularly effective for heavy industrial runoff and chemical processing plants.

• Smart Aquaculture: In fish farming and shrimp ponds, turbidity is a key indicator of organic load. Real-time data helps optimize feeding schedules and aeration, preventing sudden oxygen crashes.

• Environmental River & Lake Monitoring: Used in "Smart City" environmental grids to track sediment levels in rivers, lakes, and reservoirs, providing early warnings for erosion or pollution events.

Installation and Connection Guide

Proper Mechanical Installation

To ensure accurate readings, follow these spacing requirements:

• Side Wall Clearance: Maintain at least 5cm distance from any tank wall.

• Bottom Clearance: Maintain at least 10cm distance from the floor of the tank or beaker to avoid interference from settled solids.

• Mounting: Standard 3/4 NPT pipe thread for easy pipe or immersion mounting.

Electrical Wiring (Standard 4-Wire)

• Red: Power (12-24V DC)

• Black: Ground (GND)

• Blue: RS-485 A

• White: RS-485 B

Professional Maintenance and Calibration

Maintenance Schedule

While the self-cleaning brush handles daily buildup, we recommend:

• Monthly Visual Check: Ensure the brush is moving freely and the cable is not under tension.

• Quarterly Cleaning: For stubborn dirt, use tap water and a soft cloth. Avoid abrasive materials on the optical window.

• Calibration: Perform zero and slope calibration annually or as required by local regulations.

Two-Point Calibration Process

• Zero Calibration: Use a zero-turbidity solution. Submerge the probe vertically, ensuring it is 10cm from the bottom. Wait 3-5 minutes for stabilization before confirming the value.

• Slope Calibration: Use a known standard solution (e.g., 400 NTU). Ensure the probe is positioned correctly and the value has stabilized before completing the process via the Modbus command.

FAQ

Q1. How often should the self-cleaning brush be replaced?

Typically, the brush lasts 12 to 24 months depending on the abrasive nature of the water. In standard municipal water, it can last much longer. Replacement is simple and can be done on-site.

Q2. Can the YEX-ZS-406-S be used in seawater?

Yes. The 316L stainless steel and ABS construction provide excellent corrosion resistance. For long-term seawater immersion, we recommend checking the 316L housing for any signs of pitting during scheduled maintenance.

Q3. What is the maximum cable length supported?

The standard cable is 5 meters, but it can be customized. Since it uses RS-485 communication, the signal can remain stable over several hundred meters with high-quality shielded cables.

Q4. Does the sensor require a separate controller?

The YEX-ZS-406-S is an integrated sensor, meaning it processes the signal internally. It can connect directly to a PLC or a computer with a Modbus-to-USB converter. However, Yexsensor also offers dedicated handheld and wall-mounted controllers if a local display is needed.

Q5. How does the sensor handle temperature fluctuations?

The sensor includes a built-in Pt1000 temperature sensor for automatic temperature compensation (ATC), ensuring that turbidity readings remain accurate between 0 and 60°C.

Q6. What happens if the power supply is unstable?

The sensor operates between 12 and 24V DC. However, for the most stable optical readings, we recommend a regulated power supply. The power consumption is very low (0.2W), making it ideal for solar-powered remote stations.

Q7. Is the measurement window made of glass or plastic?

It uses high-transparency optical components protected by a durable sapphire or specialized optical glass (depending on the specific batch) designed to resist scratching from the cleaning brush.

Q8. Why is my reading showing a constant value that doesn't change?

This usually indicates a communication error or a heavily fouled window that the brush cannot clear (e.g., oil or grease). Check the wiring first, then clean the window manually with a soft cloth and mild detergent.

Quality Assurance & After-Sales Support

At Yexsensor, quality is our foundation. Every YEX-ZS-406-S unit undergoes a 72-hour aging test and a rigorous stability experiment before leaving the factory.

Warranty: 12-month warranty from the date of sale (excluding damage from improper use).

Package Includes: Sensor/Transmitter *1, User Manual *1, Quality Certificate *1.

Service Commitment: We provide comprehensive technical support for integration and calibration to ensure your project's success.