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Title: Platinum Resistance Thermometer Data Analysis
Author: David C. Parrish
Source: 1993 Measurement Science Conference
Year Published: 1993
Abstract: A capsule platinum resistance thermometer is an interpolation instrument for the International Temperature Scale of 1990 (ITS-90) over the range of 13.8 Kelvin to generally 505 Kelvin. This presentation examines four NIST calibration curves characterizing a single standard platinum resistance thermometer (SPRT) over a time span of 15 years. Temperature differences expressed on the International Practical Temperature Scale of 1968, Amended edition of 1975 (IPTS-68) and the ITS-90 for an actual thermometer are evaluated. Comparisons of absolute resistance as well as resistance ratio curves from calibration to calibration are made. Results of these comparisons are used to estimate the predictability of SPRT performance trends with time and usage. Given acceptable predictability, periodic measurement of the triple-point of water temperature is evaluated as a means to validate the existing temperature versus resistance calibration curve and estimate when a new calibration is required.

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