4-electrode conductivity sensor DEC-500B

digitalfor waterfor wastewater

Product Overview
Quadrupole conductance is composed of two electrodes that apply sine wave signals and two voltage sensing electrodes. The impedance calculated by the voltage of the induction electrode does not include circuit impedance, cable impedance, is simply solution impedance; And there is almost no current flowing through the test loop of the induction electrode, which is free from potential error caused by electrode polarization. It has the advantages of high precision, long life and small drift. It is widely used in water treatment, hydrological monitoring, wastewater treatment, swimming pool, fish pond and chemical fertilizer, chemical, biological and other fields of conductivity monitoring.

Introduction
The DEC-500B is a digital quadrupole conductivity online analyzer engineered for reliable performance in harsh working environments. Boasting high precision, long service life, and minimal drift, it is widely applied across surface water monitoring, municipal sewage treatment, industrial wastewater management, waterworks operations, industrial processes, and aquaculture.

Main Features

• Corrosion-resistant housing with IP68 waterproof rating, enabling long-term underwater operation.
• Equipped with RS485 communication interface and standard Modbus protocol for seamless integration.
• Standard digital signal output supports integration and networking with other devices without the need for an additional controller.
• Plug-and-play design for convenient, quick installation.
• Features time display, data storage, and historical data review functions.
• Optional wireless data transmission module available.
• Versatile controller mounting options: wall-mounted, panel-mounted, or pipe-clamped.

Applications

• Surface water, waterworks, and aquaculture.
• Municipal sewage, industrial wastewater, sewage treatment, and industrial processes.

Specifications

Specification	Details
Measurement Range	10μS/cm ~200mS/cm (automatic switching)
Materials	316L Stainless Steel + POM
Resolution	0.1μS/cm-1μS/cm, depends on measure range
Accuracy	±1% or 1μS/cm, whichever is greater
Repeatability	±1% or 1μS/cm, whichever is greater
Temperature Measurement Range	0~100 ℃
Electrode voltage resistance	0-0.1Mpa
Electrode Temperature Resistance	0~45℃ (not freeze)
Power Supply	9~36VDC
Communication interface	RS485, Standard Modbus protocol
Mounting Thread	Top R3/4
Cable length	Standard: 10 m, the maximum can be extended 100m

Technical Characteristics / Specifications

• Model: DEC-500B
• IP68 waterproof rating
• RS485 Modbus communication
• 316L Stainless Steel + POM construction
• Measurement range: 10μS/cm ~200mS/cm
• Accuracy: ±1% or 1μS/cm
• Temperature range: 0~100 ℃
• Power supply: 9~36VDC
• Mounting: Top R3/4 thread
• Cable: 10m standard, up to 100m