For evaluation and calibration of the thermocouple in the temperature range from 660 to 1064 C, the EMF of the thermocouple was measured at the freezing point of Al and Ag and at the melting point of gold by using the gold wire method.
For this purpose freezing point sealed cells containing high purity Al and Ag were used.
The measuring junction of the thermocouple during calibration and evaluation of the inhomogeneity was 18 cm below the surface of the Al and Ag at full immersion into the thermometer well.