Figure 7-7. - V-Notch Chlorinator - typical installation, 3 to 200 lb124 hr.

controls for semiautomatic operation (fig. 7-10). The hydraulic type can be synchronized with pump operation by means of a solenoid valve.

Motor-driven types of Hypochlorinators are made fully automatic by use of a secondary electrical control circuit actuated by a switch inserted in a disk or compound-meter gearbox (fig. 7-11). This switch closes momentarily each time a definite volume of water passes through the meter, thus starting the feeder. A timing element in the secondary circuit shuts off the feeder after a predetermined, adjustable number of feeder strokes. In the hydraulic type, the meter actuates gears in a gearbox, which, in turn, controls operation of a pilot valve in the water or air supply operating the feeder. The dosage rate is controlled by water flow through the meter, thus automatically proportioning the treatment chemical. The opening and closing frequency of the valve determines the frequency of operation of the hypochlorinator.

Other types of Hypochlorinators available include the Model S, manufactured by the Precision Chemical Pump Corporation, The Model S Hypochlorinator is a