Measurements towards the development of new standard tables for platinum-rhodium/platinum thermocouples
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.
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
Record Number: 199210377 / Last updated on: 1994-12-02
Original language: en
Available languages: en