Fluid level sensor having capacitive sensor
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United States of America Patent
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Jan 26, 1993
Issued Date -
N/A
app pub date -
Apr 24, 1991
filing date -
Jan 6, 1989
priority date (Note) -
Expired
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Abstract
A capacitive liquid level sensor utilizes capacitive principles to sense the level of a liquid contained within a receptacle. As a liquid rises and falls in the container, the dielectric effect of the liquid changes the effective capacitance of a sensing capacitor which is detected by electronic circuitry coupled to the sensor. One plate of the sensor capacitor is a probe disposed within a receptacle while a grounded conductive portion of the receptacle is a second plate of the capacitor. The liquid within the receptacle acts as a dielectric between the plates.
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