Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Patent
1986-03-17
1987-06-30
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
73 1H, 324 61R, G01G 2326, G01R 3500
Patent
active
046761004
ABSTRACT:
A system for indicating the level of material in a vessel as a function of material capacitance comprising a resonant circuit including a capacitance probe adapted to be disposed in a vessel so as to be responsive to variations in capacitance as a function of material level. An rf oscillator has outputs coupled to the resonant circuit and to a phase detector for detecting variations in phase angle as a function of probe capacitance. Level detection circuitry is responsive to an output of the phase detector and to a reference signal indicative of a predetermined level of material for indicating material level as a function of a difference between capacitance at the probe and the reference signal. An automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit. A remote module provides facility for initiating a system-test and a system-calibrate operation, either individually or sequentially.
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Berwind Corporation
Yasich Daniel M.
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