| 摘要 |
Devices for measuring the temperature of metal melts are known which have a thermocouple which is arranged in a ceramic tube closed at one end, the hot soldered junction of the thermocouple being arranged in the vicinity of the closed end of the tube, and which have an outer protective member which encloses the tube closed at one end, forming in so doing an annular space between the tube closed at one end and the inner surface of the protective member, the protective member consisting essentially of a heat-resistant metal oxide and graphite. In order to provide a temperature-measuring device by means of which the thermocouple is protected in a simple way against chemical destruction and the service life of the thermocouple is thereby increased, the annular space is essentially filled with a metal oxide powder and an oxygen-reducing/deoxidising agent, the proportion of the oxygen-reducing/deoxidising agent being approximately 5% by volume to approximately 95% by volume. <IMAGE> |
