Inter-laboratory Comparison of the Co-C Eutectic Point with Small-type Cell for Thermocouples

概要

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Using a small-type crucible, the inter-laboratory comparison of the realization of the Co-C eutectic point was executed in the industrial field in Japan, with the aim to verify the possibility of thermocouple calibration at the eutectic point with an existing furnace of not so good temperature distribution: the palladium-point wire-bridge method furnace for thermocouple calibration. A small-type crucible for thermocouples was made by the National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ/AIST). The inter-laboratory 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 three remainders are private laboratories. Four laboratories including TIRI used existing palladium-point furnace, and one laboratory made a new furnace for this inter-laboratory comparison.