A device for temperature measurement in molten metals

A device for temperature measurement in molten metals with a thermoelement which is arranged in a closed-end ceramic tube, and an outer protective body which surrounds the closed-end tube, forming an annular space between the closed-end tube and the inner surface of the protective body, characterized in that the protection body is made of a mixture of 75 to 90 wt .-% aluminum oxide, 2 to 10 wt .-% silicon oxide, 7 to 15 wt .-% of graphite, 0.1 to 1 wt .-% of Fe