How does a chlorine meter work?
The sensors work by separating the electrodes that perform the measurement from the sample, by a membrane. This membrane allows the free residual chlorine (HOCl and OCl–) or the total residual chlorine (HOCl and OCl– plus chloramines) through the membrane.
How do you make free chlorine standard?
Preparation of the chlorine standard solution: Pipette 20.0 ml KlO3/Kl standard solution into a calibrated or conformity-checked 100-ml volumetric flask, add 2 ml of H2SO4 0.5 mol/l, leave to stand for 1 min, and then add NaOH 2 mol/l dropwise (approx. 1 ml) until the solution just loses its color.
How is free chlorine measured?
There are three main methods to test free chlorine residual in drinking water in the field in developing countries: 1) Pool test kits, 2) Color-wheel test kits, and 3) Digital colorimeters.
How can I test my water for chlorine at home?
The first option for testing uses a liquid chemical OTO (orthotolidine) that causes a color change to yellow in the presence of total chlorine. You simply fill a tube with water, add 1-5 drops of the solution, and look for the color change.
What is FRC analyzer?
Reagent-less Free Chlorine Analyser The main applications for this instrument are for the measurement of free available chlorine concentration in feed water at filtration plants, pumping stations and end-of-pipe distribution points.
What is residual chlorine?
Residual chlorine is the low level amount of chlorine remaining in the water after a certain period or contact time after its initial application. It constitutes an important safeguard against the risk of subsequent microbial contamination after treatment—a unique and significant benefit for public health.
What total chlorine reading is unacceptable?
The optimal concentration of chlorine residual is between 0.3 PPM and 0.5 PPM. Levels from 0.2 PPM- 4 PPM are considered acceptable.