Free chlorine electrochemical sensor W781-DCL2.2

residual chlorinefor wastewater4-20 mA

The Inline Residual Chlorine Analyzer is equipped with German-made CL2.2 sensor, which uses a coated amperometric dual-electrode system to detect only hypochlorous acid (HOCL) in water, with automatic temperature compensation, analog/digital signal output, no zero calibration, and slope loss affected by pH; It applies to high-salt water for disinfection monitoring of drinking water, swimming pool water, slightly polluted process/cooling water, and features high-salt resistance, stable dual-electrode measurement with fast response, easy operation, and environmental demands. W771-DCL2.2 mainly consists of two parts: the control panel and the Germany-made CL2.2 free chlorine sensor. The controller displays the disinfectant value (main measured value), the pH value of the aqueous solution (a pH electrode is required for selection), and the working status. It outputs signals such as analog, digital, and switching signals. The free chlorine sensor Adopts a coated amperometric dual-electrode measurement system, with the core principles as follows: 1. Detection Target: Only detects hypochlorous acid (HOCL) in water; cannot detect hypochlorite (anionic form); only applicable to inorganic chlorinating agents (chlorine gas, sodium hypochlorite, calcium hypochlorite, chlorine generated by membrane electrolysis); cannot detect organic chlorinating agents (e.g., cyanuric acid-based products). 2. Signal Processing: Integrates a temperature sensor to achieve automatic temperature compensation, and outputs compensated signals—analog signals (4~20 mA or 0~±2V) and digital signals (Modbus RTU, via RS485 interface).