Apparatus for detecting conductive liquid level

Details Apparatus for detecting conductive liquid level Apparatus for detecting conductive liquid level

1976-06-01

1978-11-14

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

73291, 336 75, G01F 2326

Patent

active

041250214

ABSTRACT:
An apparatus for detection of the level of a liquid metal is disclosed. The apparatus has a liquid level detecting probe provided with an exciting coil wound in a closed bottom non-magnetic sheath over the approximately whole length thereof, a level detecting coil wound in the sheath in an upper part thereof, and a temperature compensating coil wound in the sheath in a lower part thereof; a temperature control for maintaining the coils at a constant temperature; a drive circuit for supplying the exciting coil with an alternating current of a determined frequency and amplitude; and a signal processing circuit for subjecting output voltages induced in the liquid level detecting coil and in the temperature compensating coil to linear detection and then determining the ratio of the thus detected outputs, thereby detecting the level of the liquid metal. At the time of operation, the liquid level detecting probe is immersed in the liquid metal the level of which is to be detected in such a manner that the temperature compensating coil is always located below the level of the liquid metal.

REFERENCES:
patent: 3058345 (1962-10-01), Mastras
patent: 3402607 (1968-09-01), Cambillard et al.
patent: 3777566 (1973-12-01), Marinaccio
patent: 3834234 (1974-09-01), Kobayashi et al.
patent: 3948100 (1976-04-01), Paris et al.
patent: 3962919 (1976-06-01), Playfoot et al.

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