Variable frequency charge pump in capacitive level sensor

Measuring and testing – Liquid level or depth gauge – Immersible electrode type

Reexamination Certificate

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Reexamination Certificate

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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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patent: 6472887 (2002-10-01), Tullis et al.
patent: 6539797 (2003-04-01), Livingston et al.
patent: 6578416 (2003-06-01), Vogel et al.

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