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The introduction of the International Temperature Scale of 1990 (ITS-90) necessitated the re-definition of the reference tables for thermocouples (IEC 584-I). The accuracy of thermocouples in general is such that the table conversion could be strictly mathematical. For S-type thermocouples however, the fact that this thermocouple was the interpolating instrument in the IPTS-68 from 630.74 C to 1064.43 C caused this approach to fail. New comparison measurements between thermocouples and high temperature standard platinum resistance thermometers (HTSPRT) up to 962 C and between thermocouples and a pyrometer above 962 C were therefore necessary.

Additional information

Authors: DE GROOT M J, Van Swinden Laboratorium, Delft (NL);CHATTLE M V, National Physical Laboratory, Teddington (GB);MARCARINO P, CNR, Istituto di Metrologia "G. Colonnetti", Torino (IT);BATTUELLO M, CNR, Istituto di Metrologia "G. Colonnetti", Torino (IT)
Bibliographic Reference: Paper presented: 7th International Symposium on Temperature, its Measurement and Control in Science and Industry, Toronto (CA), April 28 - May 1, 1992
Availability: Available from (1) as Paper EN 36631 ORA
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