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Title: Calibration And Accuracy Of Secondary Standard Prts To ITS-90
Author: Thomas J. Wiandt
Source: 1995 Measurement Science Conference
Year Published: 1995
Abstract: The Standard Platinum Resistance Thermometer (SPRT) portion of the ITS-90 was formulated for specific, very high quality PRTs. Much work has been done to demonstrate the high accuracy of tit to the ITS-90 of these instruments. However, many secondary PRT users are unsure of the accuracy of fit that can be achieved when this family of less precise and nonstandard instruments are calibrated on the ITS-90. To further complicate the issue, many of these instruments, due to their size or shape, are not suited to fixed point calibration. Therefore the calibration points are likely to differ by some amount from the actual ITS-90 fixed points. This project was undertaken to study the behavior of this family of instruments over the temperature range of 77.65 K to 773.15 K (-195.5C to 500C). PRTs from six leading manufacturers are included. The study is composed of calibration as outlined in the ITS-90 with subsequent comparison to SPRTs in various temperature calibration baths to determine the deviations in measured temperature. The data will be fitted to the mathematical formulae as outlined in the ITS-90 as well as several different sets of equations which are either proposed for use or are already in common use.

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