Title :
Non-uniqueness of the International Temperature Scale of 1990 in the range 14 K to 433 K
Author_Institution :
Nat. Inst. of Adv. Ind. Sci. & Technol., Japan
Abstract :
The non-uniqueness of the International Temperature Scale of 1990 is estimated using 6 standard capsule type platinum resistance thermometers in the range from 14 K to 302 K and 7 standard long-stem type platinum thermometers in the range 0°C to 156°C. The non-uniqueness is found to be less than 0.3 mK in almost all ranges, except a few subranges that cover from 14 K to 54 K. The inconsistency between subranges is larger than the expected value. Both must be included in uncertainty sources in resistance thermometry.
Keywords :
calibration; critical points; measurement uncertainty; resistance thermometers; temperature scales; 0 to 156 C; 14 to 433 K; ITS-90; International Temperature Scale of 1990; capsule type platinum resistance thermometers; inconsistency; long-stem type platinum thermometers; nonuniqueness; resistance thermometry; triple point of water; uncertainty sources; Electrical resistance measurement; Equations; Interpolation; Measurement standards; Platinum; Temperature control; Temperature distribution; Temperature measurement; Thermal resistance; Wire;
Conference_Titel :
SICE 2002. Proceedings of the 41st SICE Annual Conference
Print_ISBN :
0-7803-7631-5
DOI :
10.1109/SICE.2002.1195567
