Apparatus and method for determining a liquid level in a...

Details Apparatus and method for determining a liquid level in a... Apparatus and method for determining a liquid level in a...

2006-03-28

2006-03-28

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Reexamination Certificate

active

07017407

ABSTRACT:
An apparatus for determining a density-compensated liquid level in a vessel containing a mixture of liquid and vapors comprises a temperature sensor which produces a signal that is proportional to the temperature of the mixture; and a processing apparatus that includes one or more pressure sensors that allow for a measurement of an operating pressure and a differential pressure between the mixture in the vessel and a constant reference leg. The processing apparatus further includes an integral microprocessor for calculating the respective specific gravities of the liquid and vapor portions of the mixture based on the operating pressure, and then computing the density-compensated liquid level in the vessel based on such calculations of specific gravity and the differential pressure.

REFERENCES:
patent: 4527714 (1985-07-01), Bowman
patent: 4711117 (1987-12-01), Cosser
patent: 4765945 (1988-08-01), Walleser
patent: 6053041 (2000-04-01), Sinha
patent: 6157894 (2000-12-01), Hess et al.

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