Online Conductivity Sensor for Water Quality Monitoring

1. Description

JW-DDM-406(K06) Online Conductivity Sensor is designed for continuous water quality monitoring in drinking water, surface water, industrial water treatment, water supply systems, tanks, pipelines, and environmental monitoring projects. With RS485 Modbus RTU output, optional 4–20mA signal, automatic temperature compensation, and IP68 waterproof protection, it provides stable conductivity, temperature, and TDS data for PLC, DCS, controllers, data loggers, and IoT monitoring platforms.

2. Product Overview

JW-DDM-406(K06) online conductivity sensor is built for continuous water quality measurement in demanding field and industrial environments. It measures conductivity using a contact electrode method and supports automatic temperature compensation to improve measurement reliability. The sensor can output conductivity, temperature, and TDS values through RS485 Modbus RTU communication, making it suitable for smart water systems, water treatment plants, environmental monitoring stations, and automated process control systems.

Its compact submerged design, 3/4 NPT thread, and IP68 protection allow flexible installation in tanks, pipelines, reservoirs, water channels, and treatment equipment. The sensor can be integrated with PLCs, DCS systems, industrial computers, universal controllers, paperless recorders, touch screens, and IoT data acquisition terminals.

Conductivity and TDS are often monitored together with pH, turbidity, dissolved oxygen, temperature, and other indicators. These sensors can be integrated into a remote water quality monitoring system for continuous data collection, visualization, and alarms.

3. Application Scenarios

• Drinking Water Monitoring: The sensor can be used in drinking water systems to monitor conductivity changes and support water quality control.
• Surface Water Monitoring: It is suitable for rivers, lakes, reservoirs, and environmental monitoring stations where long term conductivity data is required.
• Industrial Water Treatment: The RS485 Modbus RTU and optional 4–20mA output make it practical for industrial water treatment, process water monitoring, and automated control systems.
• Water Supply Systems: It can be connected to PLCs, controllers, data loggers, and SCADA systems for continuous monitoring in municipal or facility water supply networks.
• Tanks and Pipelines: With 3/4 NPT threaded installation, the sensor supports immersion mounting, pipeline mounting, tank mounting, and flow through installation.

4. Installation Notes

For accurate measurement, the sensor should be installed with enough clearance from surrounding surfaces. During installation and testing, keep the sensor at least 5 cm from the bottom of the container and at least 2 cm from the side wall. All cable connections should be waterproofed, especially when used in long term submerged environments or corrosive water conditions.

5. Communication and Integration

The sensor supports RS485 Modbus RTU communication with a default format of 9600 baud rate, no parity, 8 data bits, 1 stop bit. Through Modbus registers, the system can read conductivity, temperature, and TDS values. The default sensor address is 1 and can be modified from 1 to 255, making it suitable for multi sensor networks.

6. Maintenance and Calibration

Regular cleaning and calibration are recommended depending on the water conditions. For routine maintenance, use a soft brush to remove deposits from the electrode surface, avoid scratching the electrode, rinse with distilled water, and then perform calibration. The sensor supports zero calibration and slope calibration using standard solutions.