Description
DAkkS (17025) calibration of a resistance thermometer at the fixed points (melting points & triple points) of the ITS-90.
Achievable DAkkS (17025) measurement uncertainties including ITS-90 deviation function (k=2):
| Temperature fixed point | in °C | Measurement uncertainties |
| Argon triple point | -189,3442 °C | 10 mK |
| Mercury triple point | -38,8344 °C | 3,5 mK |
| Water triple point | 0,01 °C | 2,5 mK |
| Gallium melting point | 29,7646 °C | 2,5 mK |
| Indium melting point | 156,5985 °C | 5,5 mK |
| Tin melting point | 231,928 °C | 7,0 mK |
| Zinc melting point | 419,527 °C | 12 mK |
| Aluminium melting point | 660,323 °C | 20 mK |
The achievable measurement uncertainties depend on the test unit.
The fixed points are selected according to the temperature ranges of the ITS-90. You can see the temperature ranges of the ITS-90 here:
Before calibration, the resistance thermometer is annealed. Hydrostatic pressure effects occurring in the fixed point cells are corrected. The self-heating of the resistance thermometer is tested before the start of calibration and taken into account when calculating the calibration results. The resistance and W values of the resistance thermometer are given as calibration results, and two characteristic curves (coefficients) are calculated according to the ITS-90 (with measuring current 0mA and 1mA, unless otherwise specified).
The minimum immersion depth of the resistance thermometer is at -189 °C: 400 mm and in the range -38 °C to 660 °C: 300 mm. The maximum outer diameter is 8 mm.
Calibration time approx. 5 working days or by arrangement.
Including Klasmeier Cloud:
Our digital archive for your calibration documents
From now on you will find a QR code on all devices calibrated by Klasmeier,
with which you can quickly and easily access our digital archive in order to view your
calibration results.
