Investigation of Pd-C cells to improve thermocouple calibration

摘要

An intercomparison of the melting temperatures of four Pd-C eutectic fixed-point cells was performed using four Pt/Pd thermocouples. The cells are designed for the calibration of thermocouples and were constructed in the participating laboratories of NPL, LNE, NMIJ and PTB. The measurements were performed in four different high-temperature furnaces but by applying the same measurement procedure. In spite of slightly different cell designs and different material sources, the melting temperatures of three of the four Pd-C cells (NPL, LNE and NMIJ) agreed very well within their expanded uncertainties of k velence 2.