Capacitance-type material level indication

Details Capacitance-type material level indication Capacitance-type material level indication

G - Physics

01

F

73/69, 73/0.5

G01F 23/26 (2006.01)

Patent

CA 1256301

Abstract of the Disclosure 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 an output 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. In the preferred embodiments of the invention dis- closed, an automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit in a pre- determined or preprogrammed manner during a calibration operation to a point indicative of the predetermined reference material level. A timer measures the duration of the automatic cali- bration operation for indicating the amount of material coated onto the probe.

489039

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