Italy : DEVELOPMENT OF NOBLE METAL THERMOCOUPLES.
Project Funding: 50000 EURO(65925.00 US Dollar)
Six gold platinum thermocouples were evaluated in respect of their repeatabilities at the freezing point of silver. Short term repeatabilities determined from measurement sequences at the laboratories were generally found to be better than 0.4 uV or 0.02 C. Reproducibilities between the laboratories varied between 2 uV or 0.1 C for two thermocouples and 13 uV or 0.5 C to 21.7 uV or 0.8 C for the remaining four thermocouples. The immersion characteristics were also checked and it was found that the effect of withdrawing a thermocouple from the freezing point cell generally caused a change in the electromotive force (emf) output equivalent to about 1 uV/cm or 0.04 C over the first few centimetres. Some measurements made at the freezing points of aluminium and tin showed short term repeatabilities similar to the measurements at silver: 0.2 uV or 0.01 C at aluminium and 0.2 uV or 0.02 C at tin. The repeatability at the tin point for measurements alternated with high temperature heat treatment of the thermocouples was 0.4 uV or 0.04 C.
2012 Al Bawaba (Albawaba.com)
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