Say Goodbye to Frequent Cleaning and Drift: YEXSensor Industrial Online Salinity Sensor

Designed for seawater and industrial high-salinity environments, a high-tolerance, maintenance-free real-time salinity monitoring solution.

Extremely Low Maintenance Cost: Electrode method combined with high-tolerance housing offers strong anti-scaling ability, even supporting sandpaper cleaning without damaging performance.

Industrial Digital Integration: Native RS-485 Modbus RTU signal output for direct connection to PLC, DCS, and edge computing gateways.

Extreme Environment Adaptation: IP68 immersion-level protection, ABS/POM composite material with excellent corrosion resistance, capable of full-range monitoring from 0~70 PSU.

YEX-DDM-206-S Online Salinity Sensor Product Overview

In seawater monitoring, industrial wastewater treatment, and high-difficulty water treatment projects, stable monitoring of salinity (Salinity) is the core of process control. However, traditional sensors often suffer from decreased sensitivity, electrode damage, and frequent data drift when facing high-salinity, scaling-prone, or impurity-containing environments, bringing huge post-maintenance costs to system integrators and operation personnel.

YEXSensor YEX-DDM-206-S online salinity sensor is born for these harsh challenges. It integrates high-precision electrode measurement technology with an intelligent digital transmitter module, capable of outputting real-time and stable PSU salinity data. The product not only selects corrosion-resistant engineering plastics in hardware but also optimizes the temperature compensation logic in software algorithms to ensure reading accuracy remains maintained in water bodies with dynamic temperature changes.

Core Technical Advantages of YEX-DDM-206-S Online Salinity Sensor

1. Excellent Anti-Fouling and Easy Maintenance

Unlike delicate laboratory electrodes, the design intent of YEXSensor YEX-DDM-206-S is "heavy industrial application". The materials used have extremely strong robustness. Even in scaling-prone environments, light pollution on the housing will not affect measurement accuracy. For severe attachments, engineers can even directly remove them using soft brushes or sandpaper. This "maintenance-free" level design greatly extends the sensor's on-site operation time.

2. Precise Temperature Drift Control Algorithm

Salinity measurement is significantly affected by temperature. YEX-DDM-206-S has a built-in high-sensitivity Pt1000 temperature sensor to capture water temperature changes in real time. Combined with YEXSensor's optimized compensation algorithm, the impact of temperature drift on salinity measurement values is minimized, with accuracy stably within ±1.5% of the reading, meeting stringent industrial and scientific research needs.

3. Anti-Electromagnetic Interference Digital Communication

The sensor adopts an RS-485 communication interface and follows the standard Modbus RTU protocol. This digital solution fundamentally solves the attenuation and interference problems of analog signals during long-distance transmission. System integrators can easily mount multiple sensors on the same bus, reducing wiring complexity and overall project cost.

4. Strict Protection Rating and Material

The housing is made of ABS and POM (polyoxymethylene) composite, balancing chemical stability and mechanical strength. The whole unit meets IP68 protection rating, paired with a 5-meter (customizable length) waterproof shielded cable, supporting long-term submersible operation under 0.6 MPa pressure (about 60 meters water depth) without fear of harsh outdoor and underwater environments.

YEX-DDM-206-S Online Salinity Sensor Technical Specifications

Application Scenarios

• Smart Ocean Monitoring: Deployed at coastal monitoring points or marine ranches to track seawater salinity changes in real time and provide early warning of freshwater injection or salinity surge risks.

• Factory Recirculating Aquaculture Systems (RAS): Provide high-precision salinity data feedback for high-value marine product aquaculture and automatically link with dosing or water replenishment systems.

• Industrial High-Salinity Wastewater Treatment: Monitor desalination efficiency in chemical and pharmaceutical wastewater treatment processes and participate in real-time closed-loop process control through digital signals.

• Desalination and Water Supply Systems: Install YEXSensor at various stages of seawater desalination projects to monitor membrane performance and produced water quality.

Installation Guide and Electrical Connection

1. Physical Installation Specifications

• Location Requirements: To ensure sufficient fluid exchange and avoid contact with walls, the sensor front end should be kept at least 5 cm from the bottom of the container and at least 2 cm from the side wall during installation testing.

• Thread Connection: Uses 3/4 NPT pipe thread for easy connection with various pipeline tees, submersible brackets, or buoy systems.

2. Electrical Wiring Definition (4-core twisted shielded cable)

• Red wire: Power positive (12～24VDC)

• Black wire: Power ground (GND)

• Blue wire: RS-485 A

• White wire: RS-485 B

Note: All wiring must undergo professional waterproof treatment (such as heat shrink tubing protection or sealing box) to prevent capillary effect from causing internal moisture ingress.

FAQ

Q1: What does the measurement unit PSU of the YEX-DDM-206-S sensor represent?

A1: PSU stands for Practical Salinity Unit, the internationally accepted salinity measurement standard in oceanography and water treatment industries. It basically corresponds numerically to the traditional parts per thousand (ppt) and more accurately reflects the conductivity characteristics of water bodies.

Q2: Why does YEXSensor emphasize that slight scratches on the electrode surface do not affect operation?

A2: The sensor adopts a unique industrial electrode structure. Its core measurement field is distributed in a specific space. The housing material selection allows a certain degree of physical wear. As long as the electrode housing is not penetrated causing internal leakage, surface cleaning or slight scratches will not change its measurement constant. This greatly reduces the difficulty of on-site maintenance.

Q3: Can the sensor be connected to Siemens or Schneider PLC?

A3: Yes, completely. YEX-DDM-206-S outputs standard Modbus RTU digital signals. As long as the PLC has an RS-485 interface and supports Modbus polling, it can directly read salinity and temperature register data without expensive analog acquisition modules.

Q4: How frequently does the sensor need calibration?

A4: Although the sensor has extremely high stability, we recommend performing one calibration every 3-6 months after initial installation or when significant environmental fluctuations occur. The calibration process is very simple and supports two-point calibration (zero point in air and slope in standard solution).

Q5: The 5-meter cable is not long enough. Can I extend it myself?

A5: Yes. Since RS-485 digital transmission is used, the signal is not easily distorted over long distances. It is recommended to use shielded twisted pair for extension. However, to ensure the best protection performance, we suggest contacting YEXSensor when placing an order to customize the specific length you need.

Q6: What to do if the sensor is covered by marine organisms?

A6: This is a common application challenge. Since YEX-DDM-206-S material is sturdy, you can clean the surface with neutral detergent, soft brush, or sandpaper. For areas with severe biological attachment, it is recommended to equip YEXSensor's optional automatic cleaning brush assembly to achieve true unattended operation.

Summary and Engineering Integration Suggestions

The YEXSensor YEX-DDM-206-S online salinity sensor has become a reliable choice for B2B water treatment engineering companies and system integrators with its "heavy industry, low maintenance" design philosophy. It not only solves the corrosion and scaling problems in high-salinity environments but also shortens project delivery cycles through simple Modbus digital integration.

Engineering Tip: For marine buoys or field monitoring stations, low power consumption is key. The ultra-low power consumption design of 0.2W of YEX-DDM-206-S is very suitable for use with our miniature IoT gateways. Welcome to consult for detailed Modbus register tables and integration guidance.