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Abstract

A liquid metering device comprises a sealed housing which defines a reserve chamber adjacent the bottom of the housing, and a measuring chamber within the housing above the reserve chamber. The measuring chamber has a pair of liquid-level sensors therein in spaced vertical relation to one another which cooperate with a control mechanism to feed liquid to be measured into the measuring chamber when the liquid level in the measuring chamber is adjacent the lower sensor, and to terminate the feeding of liquid into the measuring chamber while substantially simultaneously dumping liquid from the measuring chamber into the reserve chamber when the level of liquid in the measuring chamber rises to the level of the upper sensor. The free surface of the liquid in the measuring chamber is in direct pressure communication with the free surface of the liquid in the reserve chamber via an intervening air space in the sealed housing, whereby the bodies of liquid in the two chambers act as a pair of liquid pistons which reciprocate in opposing directions.

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First Claim