Capacitance-type material level indicator

Details Capacitance-type material level indicator Capacitance-type material level indicator

1985-10-01

1989-01-31

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73 1H, G01F 2326, G01R 2726

Patent

active

048007552

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: 3303701 (1967-02-01), Matsuura et al.
patent: 4228393 (1980-10-01), Pile
patent: 4419623 (1983-12-01), Ketchledge
patent: 4475823 (1984-10-01), Stone
patent: 4497204 (1985-02-01), Kobayashi
patent: 4499640 (1985-02-01), Brenton et al.
patent: 4499766 (1985-02-01), Fathauer et al.
patent: 4499767 (1985-02-01), Fathauer et al.
patent: 4555941 (1985-12-01), Fathauer et al.

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