THERMOCOUPLE DEVICE AND METHOD OF THERMOCOUPLE CONSTRUCTION EMPLOYING SMALL GRAIN SIZE CONDUCTORS

摘要

A temperature-measuring device (10) comprises a thermocouple junction (26) having a plurality of conductors (27) and a length of cable having at least one conductor coupling to at least one of the conductors of the thermocouple junction, wherein at least one the conductor in the length of cable comprises an iron, copper, constantan, or nickel-based alloy material having a grain size number of four or greater, measured by a grain size method defined by ASTM El 12. The use of such a small grain size prevents fracture of the conductors. The length of cable may comprise mineral insulated cable, and the conductors in the length of cable may be of type K or type N. A method of measuring temperature consistent with the invention comprises connecting a length of cable having at least one conductor to at least one of the conductors of a thermocouple junction, wherein at least one the conductor in the length of cable comprises an iron, copper, constantan, or nickel-based alloy material having a grain size number of four or greater, measured by a grain size method defined by ASTM El 12.