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Title: Realization And Dissemination Of The ITS-90 In The Range Of 0.65 K To 83.8 K At NIST
Author: Weston L. Tew, Christopher W. Meyer
Source: 1995 Measurement Science Conference
Year Published: 1995
Abstract: The International Temperature Scale of 1990 (ITS-90) has significantly improved the scale reproducibility and thermodynamic agreement relative to previous low temperature scales. A new program is in place at NIST to directly realize the ITS-90 from its definitions and to disseminate this scale to its user community. Two new facilities for the scale realization and for customer calibrations between 0.65 K and 83.8 K are now in use. We describe here the changes brought about by the advent of the ITS-90 relevant to cryogenic thermometry and the methods employed at NIST for the scale realization and comparison calibrations. These include the realization of cryogenic fixed points via both sealed-cell and unsealed-cell devices, the use of an interpolating constant volume gas thermometer, helium vapor pressure thermometry, and transferring the scale via standard platinum resistance thermometers (SPRTs) and rhodium-iron resistance thermometers (RIRTs). Calibration capability for other resistance and diode thermometers will also be discussed.

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