Patent ID: 6632018
Filing Date: 2003-10-14
Classification: G01K

Abstract:
A thermocouple temperature-detecting device comprising:a ceramic-made outer protective pipe having an outermost layer of a material mainly comprising Si3N4 and containing 10-40 vol % of BN; a first fixing member; a ceramic-made front protective pipe fixed to the inside, at a front end portion, of the outer protective pipe by the first fixing member in a manner such that a closed end head portion of the front protective pipe is projected to an outside of the outer protective pipe; a heat-resisting ceramic filler packed in an inside of the front protective pipe; a rear protective pipe fixed to an open end portion of the front protective pipe opposite the closed end head portion; and a pair of alloy element wires having different respective compositions, which are laid in the filler and constitute a temperature-measuring portion, the wires connect at a side of the closed end head portion.