Yexsensor YEX-ZS-206 Industrial Online Turbidity Sensor: Accurately Capturing Subtle Changes in Water Quality

In tap water purification, industrial wastewater treatment and environmental monitoring, turbidity is a core indicator for measuring water clarity and suspended solids content. The YEX-ZS-206 online turbidity sensor launched by Yexsensor combines advanced 90° scattered light detection technology with a highly stable fiber optic structure, providing a highly reliable and low-maintenance digital monitoring solution for smart water integrators.

Core Technical Advantages: Fiber Optic Structure and Precise Algorithm

1. 90° Scattered Light Measurement Principle

YEX-ZS-206 follows the internationally mainstream scattered light measurement standard. When an infrared LED beam enters the water sample, suspended particles in the water cause light scattering. The sensor accurately measures the intensity of scattered light in the direction perpendicular (90°) to the incident light.

• High sensitivity: Capable of accurately detecting changes in very low concentrations of suspended matter.

• Good linearity: Linearized through internal algorithms to ensure true and reliable output values across the full range.

2. Fiber Optic Structure and Infrared Light Source

• Anti-light interference: Unique fiber optic structure design combined with infrared LED (860nm) pulsed light source effectively eliminates interference from ambient light and water sample color.

• High stability: Infrared light source has long life and small drift, ensuring long-term monitoring accuracy.

3. Digital Communication and Protection

• Standard protocol: Supports RS-485 (Modbus RTU), convenient for connection to PLC, DCS or remote monitoring terminals.

• Rugged and durable: Uses POM and ABS alloy housing with IP68 protection rating, supporting installation at depths up to 20 meters underwater.

YEXsensor YEX-ZS-206 Industrial Online Turbidity Sensor Diversified Application Scenarios

The flexible range configuration (0-20/200/1000 NTU) of YEX-ZS-206 makes it suitable for various water quality environments:

• Water Treatment Plants and Drinking Water Monitoring
  In pre-filtration, post-filtration and factory water stages, the high-resolution 0-20 NTU range ensures that drinking water turbidity meets national health standards.

• Sewage Treatment Process Control
  Monitoring effluent turbidity from sedimentation tanks provides real-time feedback on sludge settling effect, helping integrators optimize flocculant dosing and reduce operating costs.

• Industrial Circulating Water and Process Water
  Monitoring suspended solids concentration in cooling circulating water systems to prevent pipeline scaling and wear, protecting expensive industrial equipment.

• Surface Water and River Section Monitoring
  Used for real-time water quality inspection of rivers and lakes to promptly detect sudden water pollution events.

YEXsensor YEX-ZS-206 Industrial Online Turbidity Sensor Technical Performance Parameters

Accessory List: 1 × sensor, 5-meter cable, instruction manual, certificate of conformity.

YEXsensor YEX-ZS-206 Industrial Online Turbidity Sensor Installation and Electrical Integration Specifications

Key Installation Distance Requirements

To prevent reflected light from affecting measurement accuracy, the following physical distance requirements must be strictly observed during installation:

• Wall distance: The sensor measuring end face should be kept more than 5 cm away from the container side wall.

• Bottom distance: The sensor measuring end face should be kept more than 10 cm away from the bottom.

• Installation method: It is recommended to use 3/4 NPT thread for submersible fixed installation, ensuring the measurement window faces vertically downward.

Electrical Wiring Definition

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

• Black wire: Power ground (GND)

• Blue wire: RS-485 A

• White wire: RS-485 B

Maintenance tip: Wiring points must be waterproofed. When installed outdoors, it is recommended to route the cable through protective tubing to avoid aging of the outer sheath due to long-term sun exposure.

Maintenance and Calibration Guide

Daily Maintenance Tasks

Window cleaning: The cleanliness of the measurement window directly determines reading accuracy. It is recommended to regularly rinse with tap water or wipe the window with a soft cloth according to the degree of water turbidity.

Cable inspection: Ensure the cable is in a relaxed state to avoid internal breakage caused by long-term tension.

Standard Calibration Process

• Zero point calibration: Place the sensor vertically in zero turbidity liquid (measuring end at least 10 cm from the bottom). After the value stabilizes, write the zero point command.

• Slope calibration: Use standard Formazin solution corresponding to the range for calibration to ensure accurate linear output of the sensor.

Common Questions and Answers (FAQ)

Q1: Does the YEX-ZS-206 use 90° or 180° measurement principle?

A1: Yexsensor adopts the internationally common 90° scattered light principle, which has extremely high accuracy in low to medium turbidity measurement and can effectively distinguish suspended particles in water.

Q2: Why should the sensor be kept 10 cm away from the bottom during installation?

A2: Sediment at the bottom or reflected light from the container bottom will seriously interfere with the scattered signal. Maintaining a distance of more than 10 cm ensures that the light beam scatters in free water, thus obtaining true readings.

Q3: What are the advantages of infrared LED light source compared to ordinary white light sources?

A3: Infrared light source (860nm) is not interfered by water sample color (such as colored industrial wastewater), and the light intensity is more stable, effectively extending the sensor's calibration-free period.

Q4: What causes severe fluctuations in sensor readings?

A4: First check whether there are air bubbles or attachments on the measurement window. Air bubbles are the biggest enemy of turbidity measurement. It is recommended to install in areas with steady flow velocity and fewer bubbles.

Q5: Does it support integration into PLC systems?

A5: Fully supported. The entire Yexsensor series provides standard Modbus RTU protocol and can directly communicate with mainstream PLCs (such as Siemens, Schneider, etc.).

Q6: How to clean stubborn scale on the window?

A6: You can use mild household detergent with a soft cloth to wipe. Do not use hard objects to scrape, as this may damage the flatness of the optical window.

Q7: Can the sensor be used in seawater?

A7: Yes. Its POM and ABS materials have good corrosion resistance, but it is recommended to clean the window regularly to prevent marine organisms from attaching.

Q8: Why is there no reading or connection failure?

A8: First check whether the wiring sequence (red-black-blue-white) is correct and whether the power supply voltage is within 12-24V. If communication is normal but the value is abnormal, try recalibrating the zero point.