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Free Chlorine Sensor Digital

Online measurement of free chlorine

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Amperometric probe with separation membrane

The free chlorine probe is based on the electrochemical measurement method, with a measurement cell that captures the free chlorine generated by inorganic chlorine products (hypochlorite, gaseous chlorine, etc.).

Thanks to this measurement method, variations in pH have a very low impact on the measurement. Temperature compensation is performed automatically by the sensor.


Robust digital free chlorine sensor works with TriBox controllers as well as the HS 100 DIN rail module.

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Measurement principle

The free chlorine probe is a potentiostatic system with 3 electrodes covered by a permeable membrane.

The measuring electrode is placed in an area containing a suitable electrolyte and separated from the water to be measured. Chlorine passes through the membrane and reacts with the electrolyte by creating an electrical signal proportional to the concentration of chlorine diffused. The signal recovered by the measuring electrode is then amplified by the electronics of the sensor. An integrated Pt100 automatically compensates the measurements according to temperature variations.


  • Stable and precise measurements compensating for temperature variations.
  • Measuring technology with low dependence on pH variations
  • Flow cell for constant pressure and flow
  • Ready to use
Measuring principleamperometry
Measuring ranges- 0 ... 2 mg/l
- 0 ... 20 mg/l
Measurement accuracy± <1% range 0 ... 2 mg / l
± <3% range 0 ... 20 mg / l
Response timeT90% - 2 min
Temperature compensationautomatic Pt100 integrated
Materialshydrophilic micro-porous membrane, PVC-U, stainless steel
Dimensions (L x Ø)205 mm x 25 mm
Weight 100 g
Interface5S-485, Modbus RTU
Power consumption0.6 W
Power supply12 to 24 VDC
Connector8-pin M12
Maintenance time<0.5 h / month
Calibration interval24 months
Maximum working pressure3 bars
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