![]() For chemicals where the required dose does vary with changes in water quality, the control should incorporate a signal from a water quality monitor. Flow proportional control is thus suitable for controlling chemicals applied at a fixed dose, such as phosphate or, in many applications, fluoride, where the dose does not change with changes in water quality. This method of control maintains a constant dose (mg/l) and does not make any allowance for variations in the incoming water quality. A flow meter provides the required flow signal. ![]() The simplest form of automatic chemical dose rate control is flow proportional control, in which the chemical dose rate is varied, by changing the speed of the dosing pump or adjusting the position of a regulating valve, in direct proportion to changes in flow past the dosing point. Ratnayaka BSc, DIC, MSc, FIChemE, FCIWEM, in Twort's Water Supply (Seventh Edition), 2017 12.27 Flow Proportional Control ![]()
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