Apparatus for detecting gaseous discharge in vacuum furnaces
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United States of America Patent
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-
Mar 9, 1993
Grant Date -
N/A
app pub date -
Jun 21, 1991
filing date -
Jun 29, 1990
priority date (Note) -
Expired
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Abstract
An electrically heated vacuum furnace is provided with special lead-through devices for transmitting current to the heating elements. In order to recognize gas discharges which can occur between a lead-through and a tank wall, the insulation of the lead-through is surrounded by an auxiliary electrode. A thermocouple can also be used instead of an auxiliary electrode. A signal derived from the auxiliary electrode can be used to shut off the furnace power to avoid damage thereto.
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