4–20mA Conductivity Sensor
The 4–20mA Conductivity Sensor is a reliable and high-precision device designed for continuous measurement of electrical conductivity in water. This advanced conductivity sensor provides accurate and stable readings, helping monitor the concentration of dissolved ions in various water treatment and industrial process applications. Adopts high-quality electrodes and advanced signal processing technology to ensure fast response, high measurement accuracy, and long-term operational stability. With a standard the conductivity sensor can easily integrate with PLC, DCS, and other industrial control systems for real-time monitoring and automated process control.
Equipped with automatic temperature compensation (ATC), the 4–20mA Conductivity Sensor maintains reliable measurement accuracy even when the water temperature changes. The sensor is designed with a durable and corrosion-resistant housing, allowing stable performance in demanding industrial environments. is widely used in drinking water treatment plants, wastewater treatment facilities, industrial circulating cooling water systems, boiler water monitoring, aquaculture operations, and environmental water quality monitoring projects. Continuous conductivity monitoring helps optimize water treatment efficiency and maintain stable process conditions.


MTW-CON5300 4-20mA Conductivity Sensor is an industrial online electrical conductivity (EC) probe with standard 4–20mA analog output.It adopts high-precision measuring module and provides stable and reliable data for water quality monitoring.
This sensor supports automatic temperature compensation to ensure high accuracy.It provides standard 4–20mA current output and optional RS485 MODBUS-RTU communication, enabling direct connection with PLC, DCS, recorder and control system.
With IP68 waterproof and corrosion resistant structure, it is suitable for long term online monitoring in various water environments.
It is widely used in drinking water, pure water, boiler water, circulating water, aquaculture and wastewater treatment systems.
Product Features
1. RS-485 transmission interface, MODBUS-RTU communication protocol, bidirectional communication.
2. Isolated power supply and output design to ensure electrical safety.
3. Built-in protection circuit for enhanced anti-interference capability, suitable for complex environments.
4. Simple and user-friendly communication protocol, capable of outputting more electrode diagnostic information for greater intelligence.
5. Low-power design for broader application scenarios; internal memory retains calibration and settings during power loss.
6. PPS housing with strong corrosion resistance, 3/4 front and rear threads for easy installation.


Working Principle
Adopt two-pole conductive detection principle. Inductive electrode measures ion conductivity in liquid, with automatic temperature compensation. Internal circuit calculates and linearly converts the measuring range into 4–20mA analog signal for PLC, DCS, data recorder and industrial control system connection.
Application
Ultrapure water equipment
RO water treatment
boiler feed water
cooling circulating water
industrial process water
municipal water supply
Technical Specifications
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Conductivity |
Measurement Range (Resolution) |
0.00 ~ 500.0mS/cm Auto-range switching,5.00uS/cm for stable low-value detection |
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Measurement Accuracy (Complete System) |
±1.5% F.S. |
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Four-Electrode |
K=0.2~0.25 |
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TDS/ Salinity |
Measurement Range |
Conductivity range × set conversion factor (TDS adjustable from 0.4 to 1.0, salinity default 0.65). |
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Temperature |
Measurement Range |
-10.0~130.0℃ |
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Resolution |
0.1℃ |
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Measurement Accuracy (Complete System) |
±0.5℃ |
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Temperature Input |
NTC10K |
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Temperature Compensation |
Automatic/Manual |
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Data Transmission |
Transmission Interface |
One RS485 isolated, 2500Vrms voltage. |
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Communication Protocol |
MODBUS-RTU (bidirectional read/write communication) |
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Other Parameters |
Operating Power |
9~26VDC |
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Operating Temperature |
0~60℃ |
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Operating Humidity |
Relative humidity < 90% |
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Protection Level |
IP67 |
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Housing |
PPS |
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Measurement Electrode |
Graphite |
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Pressure Resistance |
0~4bar |
Product Application








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