No.4（2001）4.High-temperature characteristics of noble metal thermocouples by a wire melting method

Jun ODE, Miyoshi OGAWA, Seiichi MIYASHITA and Masahiko GOTO

Standardization of a thermocouple calibration method in the high temperature range is demanded by Japanese industries. A method, that uses the melting point of palladiun(1554.8℃)is examined. The establishment of instrumental technology of using the melting-point temperature was made possible by the palladium wire method. To avoid ambiguity in assigining Emf to the palladium melting point, a data analysis program is developed which can determine a unique Emf from the data and can reject low quality plateaus. Reproducibility expressed in terms of standard deviation is 0.21K, which is better than previous results.

Keywords
Palladium, Wire method, Uncertainty

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