Capacitance-type material level indicator

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

1986-09-03

1987-06-30

Stearns, Richard R.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

G01F 2326

Patent

active

046761012

ABSTRACT:
A system for indicating level of material in a vessel as a function of material capacitance comprising a pair of parallel probe electrodes which extend through the vessel and have lower portions disposed beneath the vessel outlet in direct electrical contact with material whose level is to be measured. An electrical signal having both ac and dc components is fed to one of the electrodes, and detected at the other electrode, such that the detected ac signal component varies with both capacitance and conductance of material disposed between the electrodes while the dc signal component varies substantially as a function solely of material conductance. The dc signal component is used to compensate the ac signal component for variations in conductance, so that an output signal is provided which varies as a function of material level between the electrodes substantially independently of material conductance.

REFERENCES:
patent: 3199350 (1965-08-01), Schubring
patent: 3746975 (1973-07-01), Maltby
patent: 4010650 (1977-03-01), Piatkowski, Jr.
patent: 4232300 (1980-11-01), Wright et al.
patent: 4235106 (1980-11-01), Maltby et al.
patent: 4559507 (1985-12-01), Ramsdale et al.

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