Device for detecting electromagnetically the level of a...

Details Device for detecting electromagnetically the level of a... Device for detecting electromagnetically the level of a...

2006-04-11

2006-04-11

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

C073S29000R

Reexamination Certificate

active

07024932

ABSTRACT:
Device for detecting electro-magnetically the level of a material which is conductive, or made conductive, particularly molten glass. The device comprises an inductor (32) creating an alternating current in the material and surrounding the container (24) of the material, at least one magnetic field sensor (52, 54) in the zone delimited by the inductor, this sensor comprising a pair of transductors making it possible to detect the partial differential, along the axis of the inductor, of the radial component of the field, means (68, 70) of demodulating the signals provided by the sensor, demodulation occurring with a phase shift of approximately π/2 relative to the current supplying the inductor, and means (72, 74, 76) for processing the signals provided by the demodulation means and for providing a signal indicating that the sensor level has been reached by the material.

REFERENCES:
patent: 4014015 (1977-03-01), Gundlach
patent: 4079627 (1978-03-01), Gundlach
patent: 4138888 (1979-02-01), Linder
patent: 4144756 (1979-03-01), Linder
patent: 5103893 (1992-04-01), Naganuma et al.
patent: 5232043 (1993-08-01), Mosch et al.
patent: 6108605 (2000-08-01), Doyle et al.
patent: 6561022 (2003-05-01), Doyle et al.

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