What are the two types of online chlorine analyzers?

The two most common methods for on-line chlorine analysis are amperometric and colorimetric detection.

What is a chlorine analyzer?

What Is a Chlorine Analyzer. Chlorine sterilizes drinking and industrial water, so measuring chlorine content with a chlorine analyzer is central to ensuring water quality.

What is residual chlorine analyzer?

The RC400G residual chlorine analyzer employs a polarographic system that uses rotating platinum electrodes to provide continuous online measurement of residual chlorine concentration.

What is DPD method for free chlorine?

DPD is historically the most common method used to measure chlorine in water samples. The DPD method is a colorimetric method used to determine free and total chlorine concentration. To help you understand the difference between free and total chlorine we have written a support article which can be viewed here.

How does DPD react with chlorine?

DPD (N,N-diethyl-p-phenylenediamine) is oxidized by chlorine, causing a magenta (red) color. The intensity of color is directly proportional to the chlorine concentration. DPD reacts in much the same way with other oxidants, including bromine, chlorine dioxide, hydrogen peroxide, iodine, ozone and permanganate.

What is the difference between free chlorine and total chlorine in drinking water?

Free chlorine involves the amount of chlorine that’s able to sanitize contaminants, while combined chlorine refers to chlorine that has combined directly with the contaminants. Total chlorine is basically the sum of free chlorine and combined chlorine.

How do you measure chlorine in water?

A tablet of dpd is added to a sample of water, colouring it red. The strength of colour is measured against standard colours on a chart to determine the chlorine concentration. The stronger the colour, the higher the concentration of chlorine in the water.

How do you measure free chlorine?

The test kit can be used to measure free chlorine and/or total chlorine, with a range of 0 – 3.5 mg/L, equivalent to 0 – 3.5 ppm (parts per million). Digital colorimeters are the most accurate way to measure free chlorine and/or total chlorine residual in the field in developing countries.

How do you test for chlorine DPD?

A buffered DPD indicator powder is added to a water sample and reacts with chlorine to produce the pink color characteristic of the standard DPD test. Ferrous ammonium sulfate (FAS) is then added drop by drop until the pink color completely and permanently disappears, signaling the endpoint of the reaction.