Yexsensor YEX-DDM-206 Online Conductivity Sensor Product Overview

Yexsensor DDM-206 online conductivity sensor (model: YEX-DDM-206) is an industrial-grade digital water quality sensor launched by Yexsensor, focusing on real-time and accurate monitoring of water conductivity and total dissolved solids (TDS). The sensor adopts advanced electrode method measurement principle and integrates a high-precision Pt1000 temperature sensor to achieve automatic temperature compensation, effectively eliminating the influence of temperature changes on measurement results, ensuring high accuracy of reading ±1.5% and temperature ±0.3℃ in the 0～50℃ working environment.

As a true digital sensor, the DDM-206 outputs standard RS-485 Modbus RTU protocol, which can be directly connected to PLC, DCS, industrial control computers, paperless recorders or touch screens and other third-party equipment without additional transmitters, greatly simplifying system integration and reducing overall project costs. The sensor provides flexible range selection, covering the full range of needs from ultrapure water to high-mineralization industrial water, and supports simultaneous output of conductivity and TDS values in low ranges.

The housing combines 316L stainless steel with POM, ABS, and ABS/PC alloy materials, which not only ensures excellent corrosion resistance and mechanical strength, but also achieves lightweight design. The standard 3/4 NPT pipe thread supports submersible installation and is suitable for pipelines, tanks and open water bodies. The standard cable length is 5 meters (customizable), and the IP68 protection rating allows the sensor to be immersed in water for long-term use, and can operate stably even in humid or mildly corrosive environments. The low power consumption design (0.2W@12V) is particularly suitable for remote sites or solar-powered applications.

Yexsensor always adheres to the core concept of "reliable, professional, solution-oriented". Every DDM-206 sensor undergoes strict 72-hour aging tests and stability verification to ensure zero defects upon delivery, providing a solid guarantee for users' digital water quality monitoring.

Yexsensor YEX-DDM-206 Online Conductivity Sensor Core Technical Advantages

Wide Range and High-Precision Measurement

DDM-206 features multi-range configuration and excellent resolution with fast response, meeting the stringent requirements of different industries for water quality monitoring. Automatic temperature compensation technology ensures that data remains stable and reliable in environments with temperature fluctuations.

Digital Intelligent Output

It adopts RS-485 Modbus RTU protocol, supporting long-distance transmission and multi-device networking. Users can read conductivity, TDS and temperature data simultaneously through standard commands, with flexible integration and convenient maintenance.

Rugged and Durable Design

The IP68 protection rating combined with high-quality corrosion-resistant materials enables the sensor to adapt to various harsh working conditions. The submersible installation method is simple and reliable with low maintenance costs, making it an ideal upgrade replacement for traditional analog sensors.

Low Maintenance and Ease of Use

The two-point calibration method is simple to operate, and routine cleaning is sufficient to maintain performance. Low power consumption and wide voltage power supply further enhance the convenience of on-site deployment.

These technical features make the Yexsensor YEX-DDM-206 not only a sensor, but also a complete solution that helps users achieve precise water quality control, process optimization and compliance monitoring.

Yexsensor YEX-DDM-206 Online Conductivity Sensor Technical Specifications

Wide Application Scenarios

The Yexsensor DDM-206 online conductivity sensor, with its high reliability and flexible integration capabilities, widely serves the following fields and helps users solve pain points in water quality monitoring:

• Drinking Water and Municipal Water Supply
  Suitable for water treatment plants, secondary water supply, pipe network monitoring and other scenarios. It monitors conductivity changes in real time to ensure that factory and end water quality meet national standards, helping to ensure water supply safety and pipeline corrosion protection.

• Surface Water and Environmental Monitoring
  Long-term deployment in natural water bodies such as rivers, lakes, and reservoirs. Through submersible installation and RS-485 remote transmission, it realizes continuous online monitoring and provides reliable data support for environmental protection departments.

• Industrial Water Treatment Systems
  Widely used in circulating cooling water, boiler make-up water, and process water treatment in power plants, chemical, pharmaceutical, food and beverage industries. Precise conductivity control optimizes dosing, reduces scaling and corrosion, and lowers operating costs.

• Wastewater Treatment and Reclaimed Water Reuse
  In influent and effluent monitoring of wastewater treatment plants, industrial wastewater treatment and reclaimed water systems, the DDM-206 can effectively verify treatment effects and ensure that discharge or reuse meets standards. The high-range version is particularly suitable for high-salinity wastewater scenarios.

• Other Professional Applications
  Including reverse osmosis (RO) system monitoring, seawater desalination pretreatment, aquaculture water quality control, laboratory pure water system verification, etc. Whether for continuous monitoring or process verification, it can provide stable data support.

Yexsensor helps users build intelligent water quality monitoring networks through the DDM-206, improving production efficiency and ensuring product quality and environmental compliance.

Yexsensor YEX-DDM-206 Online Conductivity Sensor Installation and Electrical Connection

Installation Requirements

The sensor is recommended to use submersible installation, screwing directly into pipelines or tanks using 3/4 NPT thread. Installation position should pay attention to: at least 5 cm from the bottom of the container and at least 2 cm from the side wall to avoid dead zones, bubbles or wall interference. It is recommended to keep the sensor vertical or nearly vertical for the best measurement results.

For pipeline installation, a ball valve can be used to enable installation and removal without stopping the machine; for open water body installation, additional protective measures are recommended.

Electrical Connection

The cable adopts 4-core twisted shielded wire, with the following wiring sequence:

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

• Black wire: Ground (GND)

• Blue wire: 485A

• White wire: 485B

Please strictly check the wiring sequence before powering on to avoid reverse connection damaging the equipment. All wiring must be waterproof and anti-corrosion treated. The cable should have certain corrosion resistance to adapt to long-term immersion or outdoor environments.

After installation, it is recommended to power on and run in clean water for a period of time, confirm that the data is stable before calibration.

Yexsensor YEX-DDM-206 Online Conductivity Sensor Maintenance and Calibration Guide

Daily Maintenance

The DDM-206 is designed with low maintenance characteristics in mind. Depending on the actual water quality pollution level, it is recommended to clean regularly (usually 1-3 months). Method: Use a soft brush to gently remove surface attachments, avoid scratching the electrode surface, and then rinse thoroughly with distilled water.

Calibration Operation

Two-point calibration method is adopted:

1. Zero point calibration: Rinse the sensor with distilled water and dry it, power on and place it vertically in the air for about 3 minutes. After the value stabilizes, execute the zero point calibration command.

2. Slope calibration: Vertically immerse the sensor in standard solution (concentration recommended from 20% of full scale to full scale), ensure it is at least 5 cm from the bottom and 2 cm from the side wall. After stabilization, execute the slope calibration.

Regular calibration (recommended every 3-6 months) can effectively maintain measurement accuracy. Detailed Modbus calibration instructions can be found in the product appendix or by contacting technical support.

Maintenance Suggestions

• Avoid exposing the sensor to air for a long time or in extreme temperature environments.

• Regularly check the sealing of cables and connectors.

• In highly polluted conditions, consider optional automatic cleaning devices.

Scientific maintenance can significantly extend the service life of the sensor and reduce long-term operating costs.

Quality Assurance and Service

Yexsensor has a complete quality inspection system equipped with advanced testing equipment. Each DDM-206 undergoes strict tests such as 72-hour aging and stability to ensure high-quality delivery. We provide reliable warranty policies and technical support services.

Standard configuration includes:

• 1 × YEX-DDM-206 sensor

• 1 × User manual

• 1 × Certificate of conformity

• 1 × 5-meter cable

Optional accessories include extension cables, mounting brackets, standard calibration solutions, etc. Cable length customization and other personalized needs are supported.

Our professional team can provide users with full guidance on model selection consultation, installation and commissioning, and system integration.

Common Questions and Answers (FAQ)

Q1: Does the Yexsensor DDM-206 support simultaneous output of conductivity and TDS?

A1: Yes. In the 0～20 μS/cm and 0～200 μS/cm ranges, it can simultaneously output the corresponding TDS values (0-10 mg/L or 0-100 mg/L), making it convenient for users to directly obtain multi-parameter data.

Q2: How does the sensor integrate with PLC or DCS systems?

A2: It connects directly through the standard RS-485 Modbus RTU protocol. Data can be read by correct wiring only. Yexsensor can provide protocol documents and sample programs to support mainstream industrial controllers.

Q3: How often does the sensor need to be calibrated?

A3: It is recommended to perform two-point calibration every 3-6 months according to actual working conditions. The operation is simple and usually takes 10-15 minutes to complete.

Q4: Is the IP68 protection suitable for long-term immersion in water?

A4: Yes. The DDM-206 is specially designed for submersible installation and can work long-term in drinking water, surface water and industrial water. However, in highly corrosive environments, it is recommended to strengthen waterproof treatment of the wiring.

Q5: What are the key precautions during installation?

A5: The installation position should be at least 5 cm from the bottom and 2 cm from the side wall, kept in a vertical position, and all wiring must be waterproofed. Be sure to verify the wiring sequence before powering on.

Q6: What are the advantages compared with traditional 4-20mA sensors?

A6: Digital output has strong anti-interference ability, long transmission distance, no need for additional transmitters, supports multi-parameter reading, convenient networking. The overall system is simpler, lower cost, and higher precision.

Q7: What should I do if the reading shows abnormal drift?

A7: First perform cleaning and recalibration. If the problem persists, please check the installation position and flow conditions, or contact Yexsensor technical support for diagnosis.

Q8: Does Yexsensor support batch customization?

A8: Yes. We can customize cable length, special ranges or integration solutions according to requirements. Bulk users are welcome to inquire about exclusive quotes.

The Yexsensor DDM-206 online conductivity sensor has become the preferred solution in the fields of water treatment, environmental monitoring and industrial automation with its professional and reliable performance, flexible digital integration capabilities and low maintenance costs. Whether for new projects or system upgrades, Yexsensor is committed to providing you with complete and precise water quality monitoring solutions.

Welcome to contact Yexsensor for the latest quotation, technical information or on-site demonstration to jointly build an efficient and intelligent water quality management system.