Capacitance level sensor
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United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Aug 28, 1997
filing date -
Aug 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A capacitive level sensor for sensing level of a in a vessel includes a sensor coupled to the vessel having a shield and an inner sensing rod. An oscillator provides an RF signal to the shield and the sensing rod. Comparison circuitry couples to the sensing rod provides a wet/dry output in response to capacitance between the inner sensing rod and the vessel, the capacitance related to the level of the liquid in the vessel.
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