Int. J. Metrol. Qual. Eng.
Volume 6, Number 1, 2015
|Number of page(s)||7|
|Published online||23 February 2015|
Investigation of self-validating thermocouples with integrated fixed-point units
Abbestraße 2-12, 10587
2 Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy, 93210 Saint-Denis La Plaine, France
Accepted: 14 January 2015
Thermocouples are often exposed to harsh conditions when used for high-temperature measurements in industry. They suffer commonly from unavoidable drift effects which influence the required process efficiency and control. A self-validation concept for thermocouples to monitor their performance in the temperature range between 1000 C and about 1800 C in oxidizing atmospheres by using integrated miniature fixed-point units of different designs was tested. Two different models of fixed-point crucibles filled with high purity palladium (1553.4 °C) and platinum (1769 °C) have been constructed and assembled with type B thermocouples to be used as traceable references. Furthermore, two innovative self-validation methods by using thick wires of high purity gold (1064.18 °C), nickel (1455 °C), and palladium in multi-bore insulators as fixed-point materials were developed and investigated by assembling them with type B thermocouples. The measurement results obtained have demonstrated the suitability of the integrated fixed-point units to provide long-term confidence in industrial high-temperature measurements within about (2−3) K.
Key words: Thermocouple / miniature fixed point / self-validation
© EDP Sciences 2015
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