Intercomparison of calibration of Au-Pt and Pt/Rh thermocouples at fixed points in the range from triple point of water up to copper fixed-point

Project Description

This project is intended to compare the calibration of two thermocouples, one Au-Pt and one Pt-Rh, in the range from the triple point of water to the freezing point of copper. The measurements with Au-Pt will be performed only up to the freezing point of silver.
Thermocouples are no longer interpolating instruments of the International Temperature Scale of 1990 (ITS-90), but nevertheless they are used and calibrated in large numbers at National Metrology Institutes mostly at temperature fixed points.
It is proposed to organise a intercomparison with MIRS/UL-FE/LMK as the pilot laboratory. For the comparison MIRS/UL-FE/LMK will provide one stable Pt/Rh thermocouple, while DMDM will provide on Au-Pt thermocouple.
Both thermocouples will be calibrated at TPW, Ga, In, Sn, Zn, Al and Ag. Only Pt/Rh thermocouple will be calibrated at Cu. Well defined calibration and annealing procedure will be described in the intercomparison protocol.


Progress Report 2019-05-01

It is expected, that measurements will be finished by the end of this year.


Progress Report 2018-03-15

see Progress Report 2017-04-11


Progress Report 2017-04-11

We expect measurements to be finished by the end of this year, report before March 2018.


Progress Report 2016-02-11

We expect measurements to be finished by the end of this year, report before March 2017


Progress Report 2015-02-20

We expect measurements to be finished by the end of this year, report before March 2016.

Subjects
Thermometry (T)
Coordinating Institute
MIRS/UL-FE/LMK (Slovenia)