Method of using capacitor probe with a semiconductive electrode

Details Method of using capacitor probe with a semiconductive electrode Method of using capacitor probe with a semiconductive electrode

1979-09-06

1981-11-24

Goldberg, Elliot A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

361280, 361284, G01F 2326

Patent

active

043016812

ABSTRACT:
A probe for the measurement of the level of conductive materials within a conductive vessel is disclosed which is particularly suitable for the measurement of the level of conductive granular materials such as coal or other minerals or plastics or vegetable matter which are conductive. In a preferred embodiment the probe comprises a conductive steel core covered with a layer of insulating plastic and covered further with a layer of a semi-conductive material which preferably comprises a plastic which has been partially filled with a conductive material such as carbon black. Other embodiments wherein the probe may comprise a conductive plate covered by insulation further covered by a similar semi-conductive layer are also disclosed. Reference is made to prior art disclosures of circuitry and theory which enable the use of the probe of the invention.

REFERENCES:
patent: 2048450 (1936-07-01), Horn
patent: 2955466 (1960-10-01), Coles
patent: 3049584 (1962-08-01), D'Ascoli
patent: 3096210 (1963-07-01), Boonstra
patent: 3166688 (1965-01-01), Rowand
patent: 3184967 (1965-05-01), Rogers
patent: 3339412 (1967-09-01), Maltby
patent: 3706980 (1972-12-01), Maltby
patent: 3746975 (1973-07-01), Maltby
patent: 3988668 (1976-10-01), Bowers
patent: 4064753 (1977-12-01), Sun
patent: 4196464 (1980-04-01), Russell

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