If intended for human ...
Published by Apostolos Kavadias, IDRO - APOSTOLOS KAVADIAS
If intended for human consumption the residual chlorine should be monitored continously. If your instrument (chlorine analyser) has a PID signal outlet 4-20 mA, you could receive this signal by an appropriate connected dosing pump in order to regulate the chlorine dosage at the exact set point (0.2 ppm, usually, depending of the piping length).
This way the chlorine dosage will be the perfect one, non dependant from chlorine concentration (it decomposes during time), neither from chlorine consumption due to water contaminants.
Whatever estimation you will make for this specific dosage, the chlorine solution is unstable (so, you must always analyse the real concentration) and chlorine demand /consumption is dependant from water quality, which is generally not stable.
Regards !
1 Comment
Thank you all for answering my query, I beleive there are my conutry local standard which describe residual chlorine concentration at source and end point, so I think it is concluded that one can set dosing as per required concentration which has to be achieved.
Anyone can tell me how to convert from mA to PPM ?
Published by Muhammad Faraz