Point level switch
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United States of America Patent
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Jun 16, 1992
Grant Date -
N/A
app pub date -
Jan 3, 1991
filing date -
Jan 3, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A point level sensor senses capacitance of a material in a vessel to determine level. The capacitance is input to a comparator which is part of an oscillator circuit developing a square wave signal having a period corresponding to capacitance. A microprocessor includes an internal counter which determines the period of four pulses to determine an average period. The microprocessor drives relay circuits providing discrete outputs according to specific precalibrated levels to be sensed. The point sensor includes a self-test mode which operates once per second to test for shorting of the probe, expected frequency response and an open probe.
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