Patent ID: 6190038
Filing Date: 2001-02-20
Classification: G01K

Abstract:
A thermocouple lance for measuring temperatures in molten metals, comprising a protective sheath having first and second ends and in which is housed a single pair of wires of different alloys joined with each other adjacent said first end to form a junction where temperature is to be measured, said first end being closed and said protective sheath being formed of a plurality of layers laid concentrically one on top of another in alternate layers, said alternate layers comprising an outer layer made of cermet having a molybdenum matrix and an inner layer composed of at least one member selected from the group consisting of C, MgO, CaO, Al.sub.2 O.sub.3 and ZrO.sub.2, said protective sheath also containing a filler surrounding said single pair of wires and formed of porous heat-resisting ceramics, said second end of said protective sheath being closed with a sealing plug of dense heat-resisting substance and glass.