Chlorine (Cl2) Sensor Calibration: Best Practices

Chlorine monitoring shows up constantly in water and wastewater treatment, pulp and paper, and chemical processing — anywhere chlorine is used for disinfection or as a process input.

What makes Cl2 calibration tricky

Chlorine is reactive, which means calibration gas handling matters. Cylinder-based chlorine calibration gas can be inconsistent near the end of a cylinder's life as concentration shifts, which is part of why an on-demand source — generated fresh at the point of use — tends to produce more consistent results.

Calibration tips

• Calibrate at a concentration close to your actual alarm threshold for the most relevant accuracy.
• Check regulator and fitting condition before each calibration — chlorine is more reactive with worn components than inert gases.
• Keep a documented calibration log; chlorine monitoring is often tied to compliance reporting, and a clean record simplifies audits.

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