RESIDUAL CHLORINE METER

PURPOSE:To obtain a residual chlorine meter advantageous in cost, by feeding one of a soln. to be measured and reagent from an overflow tank to a measuring vessel in a constant flow rate, and controlling flow rate of the other soln. fed into the measuring vessel. CONSTITUTION:The soln. to be measured is continuously fed into the overflow tank 11 of a residual chlorine meter, always keeping it in an overflowing state, and this soln. is fed from the tank 11 to a measuring vessel 1 in a constant flow rate in accordance with the head difference. A reagent is injected into the constant flow of the soln. with a pump 13, and its flow rate is controlled so as to maintain concn. of the reagent at a predetermined value independent of the feed rate of the soln. to be measured, fluctuation of components, and the performance of the pump 13, thus obtaining a residual chlorine meter advantageous in cost.