Title: Distance measurement

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.

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Inventors: Hill, Kerry (Bakewell, GB)
Butterworth, Edward (Sheffield, GB)

Application Number: 934252
Filing Date: 1978-08-16
Publication_date: 1980-09-23
Assignee: British Steel Corporation (GB2)
Primary Class(es): 30/347
Other Classes:
US Patent Ref:

2053938	Sep, 1936	Barke, Jr.	33/126.
3494200	Feb, 1970	Mihalow et al.	73/DIG.
3909948	Oct, 1975	Markfelt	33/126.
3996801	Dec, 1976	Playfoot et al.	73/304.
4003260	Jan, 1977	Catoul	73/DIG.

Other Refs:
Primary Examiner: Little, Willis
Assistant Examiner:
Attorney: Grove, Jr.; Jesse B.