DAkkS (17025) calibration resistance thermometers at temperature fixed points (PRT, Pt 100, Pt 1000)

The DAkkS (17025) calibration of resistance thermometers (Pt100, Pt1000) is done at ITS-90 temperature fixed points.

SKU: KK-1414, KK-1421, KK-1432, KK-1435 Category: Tags: , , , , ,


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.


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