RF admittance measuring method and apparatus for determining the

Details RF admittance measuring method and apparatus for determining the RF admittance measuring method and apparatus for determining the

1974-12-12

1977-12-27

Ruehl, Charles A.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73215, 324 61P, G01F 2326, G01F 1120

Patent

active

040647536

ABSTRACT:
Various probes which are adapted to measure the liquid level in a vessel including the flow rate through a channel comprise a conductive probe electrode and guard electrode means including a rear portion located between the wall of the vessel and the probe electrode and a lateral portion extending outwardly from the lateral extremities of the probe electrode. The probe electrode and the guard electrode means are separated by interior solid insulation and an exterior solid insulation covers the probe so as to separate the guard electrode means and the probe electrode from the conductive liquid. By driving the guard electrode means at substantially the same potential as the probe electrode, the portion of a conductive coating which has accumulated at the lateral portions of the guard electrode means may be capacitively coupled to the potential of the guard electrode means thereby reducing the adverse effect of a conductive coating which has accumulated at the probe electrode.

REFERENCES:
patent: 2428700 (1947-10-01), Eilenberger
patent: 2668202 (1954-02-01), Kaplan
patent: 2820987 (1958-01-01), Bunch
patent: 2852937 (1958-09-01), Maze
patent: 3324647 (1967-06-01), Jedynak
patent: 3350777 (1967-11-01), Mendelsohn
patent: 3388423 (1968-06-01), Biskeborn
patent: 3729994 (1973-05-01), Klug
patent: 3781672 (1973-12-01), Maltby et al.
patent: 3796977 (1974-03-01), Elliott et al.

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