Distance measurement
US4223442A · kind A · utility
0Cited by
5References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1978 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Aug 16, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F23/241
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.