Chlorine sensor with membrane-covered, amperometric 3-electrode system. For the measurement of free inorganic chlorine with reduced pH-dependence, in seawater.

• Measured variable(s): NaClO (sodium hypochlorite), Ca(ClO)₂ (calcium hypochlorite), Cl₂ (chlorine gas), electrolytically generated chlorine
• Calibration: at the controller, via analytical chlorine determination by DPD 1 method
• Interferences: 75 % of the ClO₂ concentration, 80 % of the O₃ concentration, combined chlorine may increase the reading
• pH range: 4-9
• Pressure range: 0–3.0 bar, no pressure surges and/or fluctuations
• Temperature range: 0‒45 °C
• Integrated automatic temperature compensation
• Response time: T90 approx. 2 min
• Flow rate: approx. 30 l/h, low flow dependence
• Shaft length: standard 175 mm (mA version up to 220 mm)
• Connection: standard 4-pin plug; mA version 2-pole terminal, M12 socket or modbus RTU with M12 socket
• Material: PVC-U, PEEK, stainless steel 1.4571, microporous hydrophilic membrane