Measuring and testing – Liquid level or depth gauge – Hydrostatic pressure type
Patent
1974-04-24
1977-01-11
Queisser, Richard C.
Measuring and testing
Liquid level or depth gauge
Hydrostatic pressure type
G01F 2316
Patent
active
040020681
ABSTRACT:
A level-sensitive system responsive to the level of liquid in a container is provided. A level-sensitive device, e.g. a gauge or pressure switch, is connected by a line to a lower portion of the container. Gas, specifically air, is supplied to the line under pressure sufficient to enable the gas to pass slowly into the container and to bubble upwardly, thereby keeping the liquid out of the line and away from the level-sensitive device. The flow of the gas is sufficiently slow that it does not affect the operation of the level-sensitive device. A liquid such as water also can be supplied to the line under pressure to flow into the container. The quantity of the water is also maintained small enough so as not to affect the operation of the level-sensitive device. The water is effective to prevent growth of fungus or the like in the liquid of the container which otherwise can form adjacent the line leading into the container and block the line after a period of time. An upwardly-extending loop is formed in the line between the container and the level-sensitive device and specifically between the device and the water supply. This loop has its upper extremity above the maximum liquid level to be reached in the container and thus prevents the container liquid from reaching the level-sensitive device in the event of air or water failure. The device can also be removed for repair or replacement without the possibility that the liquid in the container will leak out.
REFERENCES:
patent: 1442400 (1923-01-01), Green
patent: 2553918 (1951-05-01), Hofer
patent: 2956581 (1960-10-01), Pearson
patent: 3048037 (1962-08-01), Melchior
patent: 3422682 (1969-01-01), Evans et al.
patent: 3613456 (1971-10-01), Hopfe et al.
patent: 3751185 (1973-08-01), Gottliebson et al.
Appleman John S.
Gutchess Allen D.
Overman John W.
Owens-Corning Fiberglas Corporation
Queisser Richard C.
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