A normal platinum thermal electrode

Conclusions

The utilization of the GNPT is an effective and simple method of providing unified thermoelectric testing and will solve several practical problems including:

The comparison and unification of the results of tests carried out at different times and in different places: the statistical working out and analysis of numerous thermal emf evaluations carried out in factory laboratories, which is very important for working out emf tolerances for various thermoelectric materials; a more exact determination of the thermoelectric characteristics of thermoelectrode materials and tables of emfs referred to platinum; working out a more stable technology of production of thermoelectrode materials and methods of checking their quality which would ensure higher quality production;

A simpler checking of the purity of platinum thermoelectrodes and platinorhodium-pantinum thermocouples [1] in industrial and State inspection laboratories for measurement equipment.

With the GNPT now made generally available, it is advisable to add to the existing methods of evaluating the quality of thermoelectric materials the following instructions:

To determine the value of e_N ^t at least at one temperature (for instance, 1100°C) for the produced thermoelectric platinum and note it in the production certificate of the wire; to use for determining the thermal emf and classifying standardized base metal thermoelectrode materials, only platinum which has a determined thermal emf with respect to a GNPT, and to note the values thus obtained on the production certificate of the classified material.

In future it will be necessary to establish binding standards for the thermal emf of the produced thermoelectrode materials, taken with respect to a single normal platinum thermal electrode.