Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1984-06-15
1986-12-23
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
73438, G01F 2314
Patent
active
046304789
ABSTRACT:
This invention relates to apparatus for determining the amount of liquid in a tank by measuring the pressure at the bottom and at a height above the bottom of the tank, and provides apparatus for compensating for apparent volume measurement variations caused by expansion and contraction of the tank and liquid with variation in temperature. A tube which expands in length at an exactly compensating rate varies the height of the second pressure sensor relative to the first. A further embodiment is a pneumatic system which avoids the necessity to immerse the pressure sensor, and utilizes an inexpensive single differential pressure transducer instead of two, and which cancels out the effect of any changes in zero setting of the transducer, changes in sensitivity of the transducer, or changes in atmospheric pressure.
REFERENCES:
patent: 2736199 (1956-02-01), Ibbott
patent: 3038336 (1962-06-01), Peters
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patent: 3853006 (1974-12-01), Lawford
patent: 4006635 (1977-02-01), Khoi
patent: 4109531 (1978-08-01), Lawford et al.
patent: 4136567 (1979-01-01), Rosenblum
patent: 4258745 (1981-03-01), Nicholson
patent: 4332166 (1982-06-01), Lawford
Pakwa Engineering Ltd.
Pascal Edward E.
Yasich Daniel M.
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