Liquid gaging system contamination monitor
AssigneeHoneywell Inc.
InventorJerome A. Fahley
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Abstract
The present invention is part of a liquid gaging system and comprises an apparatus for monitoring a quadrature signal from a capacitor sensor. Included is a capacitive sensor for providing a liquid measurement signal related to a liquid in a tank, the liquid measurement signal comprising a capacitive signal and a quadrature signal. The invention also includes apparatus for monitoring the quadrature signal through null detection of the capacitive signal, the null detection being implemented through a rebalance approximation sequence. The apparatus for monitoring is connected to the sensor.
Claims46
In a liquid gaging system, an apparatus for monitoring a quadrature signal from a capacitive sensor, comprising:
- a capacitive sensor for providing a liquid measurement signal related to a liquid in a tank, the liquid measurement signal comprising a capacitive signal and a quadrature signal;
- and
- means for monitoring the quadrature signal through null detection of the capacitive signal, the null detection being implemented through a successive approximation sequence, the means for monitoring being connected to the sensor.
In a liquid gaging system, an apparatus for selectively monitoring individual sensors one at a time for a quadrature signal, comprising:
- a plurality of capacitive sensors, each sensor providing a liquid measurement signal related to a liquid in a tank, each liquid measurement signal comprising a capacitive signal and a quadrature signal;
- and
- means for selectively monitoring individual sensors one at a time for the quadrature signal, the means for selectively monitoring being connected to the sensors.
Dependencies are inferred from the claim text.