Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1974-04-25
1976-11-09
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
G01F 2316
Patent
active
039903079
ABSTRACT:
A level indicator using an indirect method of measuring a gas pressure in order to check the level of a liquid such as the lubricant contained in the crankcase of an internal combustion engine. The level indicator includes preferably a liquid column gas-pressure gauge formed of a straight measuring tube having one end immersed in the barometric liquid contained in a reservoir, and an electrical heating resistance is located in the enclosure of the reservoir above the barometric liquid. The enclosure communicates with a tubular probe immersed in the liquid whose level is to be checked. Voltage applied to the resistance generates heat which as a result of the thermal expansion of the gas causes the gas-pressure in the enclosure to become sufficient for causing the gas to bubble in the liquid, so that the gas-pressure which is read off the pressure gauge is representative of the depth at which the probe is immersed. The pressure gauge can be mounted on the dash-board of a vehicle and, by connecting the heating resistance across the oil pressure warning light of the vehicle, an automatic reading of the oil level is obtained on starting of the internal combustion engine.
REFERENCES:
patent: 2012511 (1935-08-01), Hubbard
patent: 3230769 (1966-01-01), Carver et al.
patent: 3307397 (1967-03-01), Brown et al.
patent: 3834236 (1974-09-01), Durin
Antonis William N.
Appleman John S.
McCormick Jr. Leo H.
Queisser Richard C.
Societe Anonyme D.B.A.
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