4 Electrode Conductivity Sensor
The 4 electrode conductivity sensor adopts advanced four-electrode measurement technology, effectively eliminating polarization interference and suitable for high conductivity, high turbidity and polluted water.
Wide measuring range, no easily affected by dirt and organic pollutants. Multiple ranges for industrial wastewater, brine, cooling water and chemical process water. 316L stainless steel housing, built-in temperature compensation, IP68 waterproof, 3/4" NPT thread, optional RS485 or 4–20mA output.
A 4-electrode conductivity sensor represents the gold standard for accurate and versatile conductivity measurement. By separating the current-carrying and voltage-sensing functions, this design overcomes the limitations of traditional 2-electrode sensors, delivering superior performance across a wide spectrum of applications, from ultrapure water to concentrated solutions.
How It Works: The Principle of Separation
The core innovation of a 4-electrode sensor lies in its four distinct electrodes, typically made of graphite or stainless steel. These are arranged in two independent pairs:
1. Outer Current Electrodes: An alternating current (AC) is applied across the two outer electrodes, driving a current through the solution.
2. Inner Voltage Electrodes: The two inner electrodes measure the resulting voltage drop in the solution between them.
This separation is key. Because the voltage is measured with a high-impedance circuit that draws negligible current, the measurement is unaffected by polarization effects or the resistance of the electrode leads. The conductivity is then calculated directly from the measured voltage and the known applied current, based on Ohm's Law (G = I/U
Primary Applications
Water & Wastewater Treatment:
Monitoring all stages of treatment, from influent and effluent in municipal plants to process control in industrial wastewater. Their resistance to fouling is a major asset in these environments.
Chemical & Pharmaceutical Processing:
Precise concentration monitoring of acids, alkalis, and salts, as well as controlling Chemical Injection and Clean-in-Place (CIP) cycles.
Power Generation:
Ensuring the extreme purity of boiler feedwater and monitoring steam condensate to prevent costly corrosion and scaling in turbines and heat exchangers.
Food & Beverage:
Hygienic-design sensors are used for product quality control, phase separation, and monitoring cleaning processes, meeting strict sanitary standards (e.g., 3-A, EHEDG).
Environmental Monitoring: Measuring salinity and total dissolved solids (TDS) in surface water, groundwater, and seawater.
Technical Parameters
|
Parameter |
Specification |
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Conductivity Measurement Range |
10μS - 500mS |
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Measurement Accuracy |
±1% |
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Temperature Measurement Range |
0.0 - 100.0℃ |
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Temperature Measurement Accuracy |
±0.3℃ |
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Temperature Compensation |
Pt-1000/NTC10K/NYC30K (customizable) |
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Operating Humidity |
Relative humidity <90% |
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Pressure Resistance Range |
0 - 7 Bar |
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Housing Material |
PBT |
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Sensitive Membrane Model |
H5082 |
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Process Connection |
NPT3/4 |
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Electrical Connection |
Direct 5m signal cable |
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Electrode Protective Sleeve |
Included |
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Protection Level |
IP68 |
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Weight |
<0.5kg |
Product Application
