Method of manufacturing capacitance-type material level indicato

Details Method of manufacturing capacitance-type material level indicato Method of manufacturing capacitance-type material level indicato

1982-08-25

1985-02-19

Hall, Carl E.

Metal working

Electric condenser making

29825, 29883, 73304C, 264262, 26427213, 26427215, 324 61P, H01G 500

Patent

active

044996403

ABSTRACT:
A system and probe 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 disclosed, an automatic calibration circuit adjusts the resonance characteristics of the parallel resonant circuit of the reference signal indicative of a predetermined reference material level.

REFERENCES:
patent: 2444997 (1948-07-01), Lovesey
patent: 2852937 (1958-09-01), Maze
patent: 2955466 (1960-10-01), Coles
patent: 3119266 (1964-01-01), Atkinson
patent: 3339411 (1967-09-01), Riffie
patent: 3879644 (1975-04-01), Maltby
patent: 3988668 (1976-10-01), Bowers
patent: 4025846 (1977-05-01), Franz et al.
patent: 4178623 (1979-12-01), Emmerich et al.

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