Product description
The sensors for free chlorine OCS140/141 is an amperometric, membrane-covered sensor for installation in the OCA250 assembly.
Oxidising agents such as chlorine or anorganic chlorine compounds are used for disinfection of water. Their  dosing must be carefully controlled to suit the application. Too low a concentration makes the degree of disinfection questionable. Too high a concentration can result in corrosion effects, impairment of taste or skin irritation.

Your benefits:
Minimum flow rate for installation in the OCA250 flow assembly: 30 l/h
Measurement almost independent of flow rate in the range above 30 l/h
No zero point calibration necessary. This means complicated installation of an active carbon filter, as in open chlorine sensors, is not necessary.
Measured values are not affected by conductivity fluctuation. 
The OCS140 sensor is ready for measurement after a polarisation time of approx. 30 ... 60 minutes. The OCS141 sensor requires 45 ... 90 min. 
Easy membrane replacement thanks to ready-made membrane head
Recalibration intervals approx. 1 ... 4 months under constant operating conditions
Back pressure up to 1 bar / 14.5 psi allowed at the outlet

Field of application
The OCS140/141 chlorine sensor is applied for measurement of free active chlorine in the following fields:
Drinking water treatment
Pool water treatment
Industrial water treatment