Apparatus and method for sensing high and low liquid level to co

Details Apparatus and method for sensing high and low liquid level to co Apparatus and method for sensing high and low liquid level to co

1983-12-23

1985-12-10

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 83N, H01H 3540

Patent

active

045581959

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.

REFERENCES:
patent: 2406719 (1946-08-01), Upson
patent: 3268683 (1966-08-01), Palmer
patent: 3424883 (1969-01-01), Heskett
patent: 3760396 (1973-09-01), Haselton
patent: 4000386 (1976-12-01), Brouwer
patent: 4127360 (1978-11-01), Carpenter

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