Walchem, Iwaki America Inc.

Amperometric Free Chlorine Measurement without pH Compensation

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Courtesy of Walchem, Iwaki America Inc.

Accurate measurement and control of free chlorine in water is critical in many applications. Amperometric sensors are a popular alternative to colorimetric analyzers since the measurement is continuous and no reagents are required, however most sensors are extremely sensitive to pH fluctuations and have a limited pH range where they will function. Expensive pH measurement and control is one solution, in order to maintain the pH of the water at a stable value that is in the narrow range the sensor requires.

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