Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1982-04-26
1984-05-08
Myracle, Jerry W.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
73438, G01F 2318
Patent
active
044467303
ABSTRACT:
A liquid sensing and gauging method and apparatus employing a differential pressure sensing device located near the bottom of the tank and an absolute pressure sensing device located at the same level as one of the differential pressure sensing device elements. The differential sensing device is connected for driving the arm of a potentiometer included in an electronic circuit to develop an intermediate voltage exponentially proportional to the reciprocal of the specific gravity of the tank liquid. Similarly, the absolute pressure sensing device is connected for driving the arm of a potentiometer which is biased by the intermediate voltage. The output on this arm is then indicative of the height of the tank liquid only, regardless of the specific gravity of the liquid. The height level output can be multiplied by an area voltage to indicate tank volume. This tank volume voltage can be added to other similar outputs to indicate total system volume of a system comprising a plurality of tanks.
REFERENCES:
patent: 3038336 (1962-06-01), Peters
patent: 3045492 (1962-07-01), Kutzler
patent: 3397581 (1968-08-01), Bush
patent: 4006635 (1977-02-01), Khoi
patent: 4043193 (1977-08-01), Bailey
patent: 4109531 (1978-08-01), Lawford et al.
patent: 4262531 (1981-04-01), Hewitt et al.
patent: 4358956 (1982-11-01), Ruben et al.
Myracle Jerry W.
Noland Tom
Quintex Research International, Inc.
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