Disclosed is an apparatus for selectively measuring liquids from a plurality of sources and dispensing the liquids into a mixing tank. The apparatus has a plurality of storage tanks for holding various types of liquids. These storage tanks are independently connected through suitable conduits, valves and pumps to a measuring chamber. A float is positioned in the chamber and is connected by a chain to a rotatable disk, to rotate the disk as the position of the float varies within the chamber due to the addition of liquids therein. The disk is provided with a plurality of radially spaced natural magnets which periodically close a mercury switch to generate electrical pulses as the volume of liquid in the chamber increases. A pulse counter and control circuit is connected to the reed switch to close the inlet valve and de-energize the inlet pump. A plurality of outlet conduits, valves and pumps are connected to the chamber to convey the fluids from the chamber to a mixing tank. The operation of these outlet valves and pumps is controlled by the control circuit to discharge the liquid from the chamber when the desired volume is present. A wash water, inlet valve is also connected to the chamber to rinse the interior of the chamber between successive dispensing cycles. A drain and drain valve are provided to remove the rinse water from the chamber.
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