Interlaboratory Comparison of the Co-C Eutectic Point with Small-Size Cell for Thermocouples

摘要

Using a small-size crucible, interlaboratory comparison of the realization of the Co-C eutectic point was performed in the industrial field in Japan, with the aim of verifying the possibility of thermocouple calibration at the eutectic point with an existing furnace of less-than-ideal temperature distribution, namely, the palladium-point wire-bridge method furnace for thermocouple calibration. A small-size crucible for thermocouples was made by the National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ/AIST). The interlaboratory comparison was piloted by the Tokyo Metropolitan Industrial Technology Research Institute (TIRI), a public test and research organization in Tokyo, and was conducted among five calibration laboratories including the pilot. One of the five laboratories is a designated calibration laboratory in Japan, and the other three are private laboratories. Four laboratories including TIRI used an existing palladium-point furnace, and one laboratory made a new furnace for this interlaboratory comparison.