Statistical Analysis of Type S Thermocouple Measurements on the International Temperature Scale of 1990

摘要

Data collected by scientists from eight national laboratories were used to estimate the differences between temperatures on the International Temperature Scale of 1990 and the International Practical Temperature Scale of 19658, Amended Edition of 1975 between 630.615 degrees C and 1064.18 degrees C. A new reference function for type S thermocouples was determined for the temperature range -50 degrees C to 1064.18 degrees C. The new reference function was combined with two other reference functions for temperatures between 1064.18 degrees C and 1768.1 degrees C to provide a complete set of reference functions on ITS-90 for type S thermocouples. This paper describes the reference functions and statistical analyses used to estimate differences between the two temperature scales. Issues addressed include: variability within laboratories, form of the new reference functions, and the uncertainty associated with the reference functions.