Method, apparatus, hardware, and computer program product...

Details Method, apparatus, hardware, and computer program product... Method, apparatus, hardware, and computer program product...

2007-03-27

2008-03-18

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

C073S30400R

Reexamination Certificate

active

07343798

ABSTRACT:
A method, apparatus, hardware, and computer program product for measuring a parameter related to the height of a liquid in a measurement vessel. An alternating voltage is applied to an input rod positioned in a reference vessel containing the liquid at a known height. A reference signal is obtained from a collector rod positioned in the reference vessel. An alternating voltage is also applied to an input rod positioned in the measurement vessel, and a measurement signal is obtained from a collector rod positioned in the measurement vessel. A parameter related to height of liquid in the measurement vessel is obtained based upon a relationship between the reference voltage and the measurement voltage, wherein the parameter is substantially independent of the electrical conductivity of the liquid in the vessels. Circuitry for determining the height is described.

REFERENCES:
patent: 6125696 (2000-10-01), Hannan et al.
patent: 2007/0252715 (2007-11-01), Reddy et al.

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