Continuous measurement of chlorine and chlorine dioxide in the beverage industry
The outline of a method for determination of free chlorine and total chlorine is set out in DIN 38408, Part 4. The DPD method is described here, this is measured with a photometer or a colorimeter in the form of a colour reaction (reference method). Determination of chlorine dioxide is based also on DPD colour comparison.
Disinfectants such as chlorine and chlorine dioxide are used e.g. in the bottle washer, rinser, CIP plant as well as for treating brewing liquor and process water. In as far as the Drinking Water Regulation applies, it requires that the amount of product used be checked weekly and concentration of active substance in the treated water be measured daily. Stipulations also apply to the allowable amounts which can be added. For chlorine, this is 1.1 - 0.05 - 0. ..
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