Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1991-11-15
1992-12-01
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
73290R, 73302, G01F 2314
Patent
active
051671557
ABSTRACT:
A system (10) and methods of use for determining the level of a body of liquid (16), e.g., a chemical, in a storage tank, irrespective of the specific gravity of that liquid. The system (10) comprises a pressure transducer (22) and an elongated tubular, flexible sheath (24). An operating liquid (26) of lower specific gravity than the body of liquid (16) is disposed within the sheath (24). The transducer (22) is also disposed within the sheath adjacent the bottom end. The sheath (24) is immersed in the body of liquid (16) so that its top end (28) is above the liquid's surface. The pressure applied to the sheath (24) by the liquid (16) causes the sheath to collapse to a minimal internal cross sectional area, whereupon the operating liquid migrates up the sheath to form a very thin column (44). The operating liquid forming a pool (46) is located at the top of the very thin column (44). Thus, the sheath expands outward adjacent the surface (16A) of the body of liquid to retain that pool. The pressure transducer provides an electrical signal representing the pressure applied thereto by the combined height of the operating liquid column (44) and the operating liquid pool (46). This signal is used to calculate the height of the body of liquid (16). An air vent (52) is provided to vent the transducer to compensate for atmospheric pressure changes.
REFERENCES:
patent: 1830116 (1931-11-01), Kruft
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patent: 3421538 (1969-01-01), Hembree
patent: 4154103 (1979-05-01), Fling
patent: 4335606 (1982-06-01), Michalak
patent: 4637254 (1987-01-01), Dyben
patent: 4897797 (1990-06-01), Free, Jr. et al.
Bennett G. Bradley
Betz Laboratories Inc.
Cuchlinski Jr. William A.
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