Apparatus for the capacitative measurement of the surface level

Details Apparatus for the capacitative measurement of the surface level Apparatus for the capacitative measurement of the surface level

1977-01-21

1978-01-24

Gill, James J.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

G01F 2326

Patent

active

040697100

ABSTRACT:
Apparatus for the capacitative measurement of the surface level of a fluid medium in a vessel comprises a probe mounted to provide a capacitance between itself and the surface, the probe being connected into one of two RC-circuits, respectively connected to opposite ends of a secondary winding of a transmitter, the primary winding of which is in a resonant high-frequency generator circuit. The two RC-circuits are earthed and respectively connected through rectifiers to the inputs of a differential amplifier, the output of which provides an output signal corresponding to the capacitance between the probe and surface level. The RC-circuit associated with the probe comprises a parallel manually adjustable capacitor and a capacitance diode arranged for the remote adjustment of the RC-circuit. Where there is a substantial separation of the probe from the RC-circuits a two-core high-frequency cable is used with one core connecting the probe into the associated RC-circuit and the other core connecting an insulated point on the probe to the other RC-circuit. A simple, sensitive apparatus, unaffected by temperature variations is thereby provided.

REFERENCES:
patent: 2300562 (1942-11-01), Freystedt
patent: 3540277 (1970-11-01), Roth et al.
patent: 3916689 (1975-11-01), Donnelly

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