Variable frequency charge pump in capacitive level sensor

Details Variable frequency charge pump in capacitive level sensor Variable frequency charge pump in capacitive level sensor

2005-12-02

2008-09-09

Williams, Hezron E. (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

Reexamination Certificate

active

07421896

ABSTRACT:
A method of determining a fluid or material level. The method comprises the steps of: providing, at a first frequency, a current operatively capable of changing a capacitor; charging at least first and second capacitive devices to a predetermined voltage using the provided current; measuring the amount of current respectively necessary to charge the first and second capacitive devices to the predetermined voltage; determining a liquid level based on the measured signals from charging the first and second capacitive devices; and varying the first frequency.

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