YEX-DDM-206 Online Conductivity Sensor Product Introduction

In modern industrial production and environmental governance, real-time monitoring of water quality conductivity (EC) and total dissolved solids (TDS) is a key indicator for measuring water purity, ion concentration, and process control. Yexsensor's YEX-DDM-206 digital online conductivity sensor provides a reliable water quality monitoring solution for system integrators and end users with its excellent anti-interference ability, convenient digital communication, and strict industrial-grade protection.

Digital Monitoring New Benchmark: Performance Advantages Overview

YEX-DDM-206 is not only a measuring element, but also a highly integrated digital terminal. Through the built-in high-precision processing chip, the sensor can complete the conversion from analog signal to digital signal at the front end, fundamentally solving the pain points of traditional analog sensors that are susceptible to environmental electromagnetic interference and serious signal attenuation in long-distance transmission.

Core Technical Highlights

• Dual-parameter synchronous output: A single sensor can output conductivity value and TDS value in real time at the same time, reducing system integration cost and simplifying upper computer data processing logic.

• High-precision temperature compensation: Integrated Pt1000 platinum resistance temperature sensor, supporting 0～50℃ full automatic temperature compensation, eliminating the influence of water temperature fluctuation on conductivity measurement, and ensuring data consistency under different seasons and different working conditions.

• RS485 communication interface: Adopting the internationally common Modbus RTU protocol, with strong compatibility. Whether it is PLC, DCS system, industrial control computer or touch screen, it can achieve "plug and play" seamless docking.

• Industrial-grade protection design: ABS and ABS/PC alloy shell combined with full potting sealing process, protection level up to IP68, supporting long-term complete immersion in liquid, and has excellent resistance to weak acid and alkali corrosion.

Wide Application Scenarios and System Integration Solutions

The design intention of YEX-DDM-206 is to cope with changeable and harsh on-site environments. Its flexible installation method and stable signal output make it the preferred equipment in the following fields:

1. Urban water supply and drinking water safety monitoring
   In the water purification process of water plants, secondary water supply pump rooms and direct drinking water terminals, real-time monitoring of conductivity is an intuitive means to evaluate filter membrane performance and water quality stability. The low detection limit (2μS/cm) of YEX-DDM-206 ensures its precise performance in pure water and low ion concentration environments.

2. Industrial process circulating water and cooling water treatment
   The circulating water of industrial boilers, cooling towers and central air conditioning systems needs strict control of ion concentration to prevent scaling or corrosion. Through the real-time feedback data of YEX-DDM-206, the system can automatically trigger sewage discharge or dosing instructions, significantly improving energy efficiency and extending equipment life.

3. Environmental monitoring and surface water evaluation
   In automated monitoring stations of rivers, lakes, reservoirs and groundwater, the sensor can be used with data collectors (RTU) to upload data to the cloud platform through wireless networks. Its immersion installation design (3/4 NPT thread) is very suitable for use in water quality monitoring buoys, water intake floating platforms or pipeline pump rooms.

4. Agricultural irrigation and water-fertilizer integration
   In modern agriculture, the EC value of nutrient solution directly affects crop growth. YEX-DDM-206 can operate stably in fertilizer solution for a long time and provide core feedback data for precise irrigation control systems.

YEX-DDM-206 Online Conductivity Sensor Technical Performance Specifications

Installation Guidance and Electrical Connection Instructions

Scientific Installation Position Recommendations

In order to ensure the representativeness of measurement data and extend the service life of the sensor, please follow the following guidelines when installing:

• Flow rate suggestion: The sensor should be installed in an area with stable flow rate to avoid air bubbles accumulating on the electrode surface.

• Spacing requirements: When installed in a container, the sensor measuring end should be at least 5 cm away from the bottom and at least 2 cm away from the side wall.

• Avoid dry burning: Ensure that the measuring part is always completely immersed in the liquid to be measured to prevent the electrode from drying and scaling.

Standard Electrical Wiring

The sensor adopts 4-core twisted-pair shielded wire, which can effectively suppress electromagnetic interference from on-site frequency converters and other equipment.

• Red wire: Power positive pole (V+)

• Black wire: Power ground wire (GND)

• Blue wire: RS485-A

• White wire: RS485-B

Safety tip: Please carefully check the wiring sequence before powering on. All exposed wiring heads must be professionally waterproofed (such as using waterproof junction boxes or heat shrink tubes) to prevent moisture from seeping into the cable and causing sensor damage.

Maintenance, Care and Calibration Guide

As a precision measuring instrument, periodic maintenance is the core of maintaining the accuracy of YEX-DDM-206.

1. Cleaning Process

• Routine cleaning: It is recommended to check the electrode surface once a month. If there is biological attachment or dirt, please use a soft brush to gently remove it (do not use hard sharp tools to scratch the electrode sheet), and then rinse repeatedly with distilled water.

• Inductive characteristics (if applicable): For inductive electrodes, the cleaning force can be appropriately increased. Slight surface scratches usually do not affect performance, but care must be taken to prevent damage to the shell.

2. Standardized Calibration Steps

• Zero point calibration: Place the sensor in the air (ensure it is dry and away from electromagnetic interference sources), and send the zero point calibration command after the reading is stable.

• Slope calibration: Use a standard solution of known concentration (it is recommended to select a calibration solution between 20% - 100% of the full scale according to the actual range). Ensure the ambient temperature is stable, completely immerse the sensor in the calibration solution and maintain the specified spacing, and perform slope calibration after the reading is stable.

Frequently Asked Questions

Q1: Can YEX-DDM-206 directly output 4-20mA signal?

A1: This model natively supports RS-485 (Modbus RTU) digital output. If 4-20mA analog signal is required, it is usually necessary to pair with our protocol conversion module or a general controller that supports Modbus to analog.

Q2: Why is the value of my sensor high when measuring in pure water?

A2: Please check the installation environment. If the sensor is too close to the container wall (less than 2cm) or there is strong electromagnetic interference around, it may produce induction deviation. In addition, please confirm whether zero point calibration has been performed.

Q3: How many meters of long-distance transmission does the sensor support?

A3: Based on the RS-485 differential signal transmission characteristics, the theoretical transmission distance can reach 1000 meters in a standard twisted-pair shielded wire environment. However, during long-distance transmission (more than 100 meters), it is recommended to connect a 120Ω terminating resistor at the end to ensure signal quality.

Q4: How does the shell material ABS/PC perform in strong acid and strong alkali environments?

A4: ABS/PC has good chemical resistance and is suitable for weak acid and alkali and ordinary industrial wastewater. If your application environment contains strong oxidizing acids or high-concentration organic solvents, please contact technical support to recommend PTFE or special alloy material versions.

Q5: What is the measurement frequency of the sensor? Can it be adjusted?

A5: The internal sampling frequency of the sensor is extremely high, but the Modbus communication response usually recommends a query interval of no less than 500ms to ensure the stability of data reading.

Q6: How to judge that the electrode has aged and needs to be replaced?

A6: When the sensor is calibrated in a standard solution, if the slope deviates significantly from the initial value (such as exceeding 20%), or the response time slows down significantly (still unable to stabilize after more than 60s), it may mean that the electrode surface is damaged or aged. It is recommended to contact the manufacturer for return factory inspection.

Q7: How is TDS and conductivity converted?

A7: The sensor has a preset standard conversion coefficient (usually between 0.5 and 0.7). Users can also adjust the conversion coefficient through Modbus commands according to specific water quality components to obtain more accurate TDS readings.

Q8: Is a reference program for PLC debugging provided?

A8: Yes. We provide standard Modbus register address tables and communication logic example codes for commonly used PLCs such as Siemens and Mitsubishi for purchasing users to help you quickly complete system development.

Quality Assurance and After-sales Service

Yexsensor adheres to the principle of "quality first". Every YEX-DDM-206 sensor has undergone 72 hours of continuous aging test and three-point pressure stability test before leaving the factory.

Warranty policy: Provide one-year limited warranty from the date of sale (excluding man-made damage).

Packing list: Sensor body (5 meters standard cable), instruction manual, certificate of conformity.

If you have any questions about the application solution of YEX-DDM-206, or need to customize cables of specific lengths and special installation brackets, please feel free to contact our engineering team.