Apparatus and method for sensing high and low liquid level to control a circuit
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United States of America Patent
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-
Dec 10, 1985
Grant Date -
N/A
app pub date -
Dec 23, 1983
filing date -
Dec 23, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention is directed to apparatus for sensing high and low liquid level for the purpose of controlling a circuit. As liquid rises, gas within a first communicating line to a differential pressure switch is relieved through a check valve to atmosphere. When the liquid rises sufficiently, the pressure within a second communicating line causes closure of the switch and the circuit. As the level of liquid recedes, the check valve closes and a vacuum develops in the first connecting line so that the switch and circuit remain closed until the liquid level is below the entry to the first communicating line. At that time, the liquid within the communicating line exits and the pressures are equalized to the switch which then opens thereby opening the circuit.
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