Distance measurement

Details Distance measurement Distance measurement

1978-08-16

1980-09-23

Little, Willis

Geometrical instruments

Area integrators

Electrical

33169B, 73304R, 73DIG9, G01F 2300

Patent

active

042234425

ABSTRACT:
The invention is concerned with establishing the datum level of a lance or cartridge relative to the surface of a bath of molten metal in a metallurgical vessel. A voltage is applied to the movable lance or cartridge in such manner that contact of the lance or cartridge with the bath surface causes an earth leakage current to be established. Electrical circuitry is incorporated to open a circuit breaker upon flow of a predetermined earth leakage current and actuate an indication on a distance measuring device coupled to the movable lance or cartridge.

REFERENCES:
patent: 2053938 (1936-09-01), Barker, Jr.
patent: 3494200 (1970-02-01), Mihalow et al.
patent: 3909948 (1975-10-01), Markfelt
patent: 3996801 (1976-12-01), Playfoot et al.
patent: 4003260 (1977-01-01), Catoul

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