Chlorine sensor with membrane-covered, amperometric three-electrode system. For the measurement of free chlorine on the basis of iso-cyanuric acid, also in seawater.

• Measured variable(s): NaClO (sodium hypochlorite), Ca(ClO)₂ (calcium hypochlorite), Cl₂ (chlorine gas), electrolytically generated chlorine, and organically combined chlorine based on iso-cyanuric acid (tested up to an iso-cyanuric acid concentration of 500 mg/l)
• In the presence of isocyanuric acid, the sensor measures the total bound organic chlorine (in the isocyanuric acid) and the free chlorine already released from it
• Calibration: at the controller, via analytical chlorine determination by DPD 1 method Observe the isocyanuric acid concentration when determining the free chlorine
• Interferences: ClO₂ is 100 % detected, O₃ is detected
• pH range: 4‒12, greatly reduced pH dependence
• Pressure range: 0‒0.5 bar, no pressure surges and/or fluctuations
• Temperature range: 0‒45 °C, (no ice crystals allowed in the sample water)
• 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