Apparatus and methods for sensing fluid levels

Details Apparatus and methods for sensing fluid levels Apparatus and methods for sensing fluid levels

2005-09-06

2005-09-06

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C073S30400R, C340S620000

Reexamination Certificate

active

06938476

ABSTRACT:
Devices and methods are disclosed for sensing the level of a fluid in a reservoir. The device comprises a generator for generating symmetrical pulses of electric potential, a ground generator in communication with the above generator, means for sensing resistance, and a latch circuit in communication with the above means for sensing resistance. In a method of the invention, a first electric potential is applied to an electrode within the reservoir. The first electric potential has a predetermined value and duration. The resistance of fluid within the reservoir is measured during application of the first electric potential. A second electric potential is applied to the electrode after the measurement for a period of time substantially equivalent to the duration of the first electric potential and of a value substantially equivalent to and opposite to the predetermined value of the first electric potential.

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