Abstract
The systematic difference between the Callendar-Van Dusen function and the ITS-90 polynomial for working platinum resistance thermometers with different values of W(100) is analyzed and it is shown that this difference is not related to the purity of the platinum over a wide range of values of W(100), and depends considerably on the temperature range. A method of calculating the standard relations for platinum resistance thermometers is proposed based on a quadratic approximation of the ITS-90 function, and a method of constructing individual functions for platinum resistance thermometers in the 0-230°C range using a single calibrated point in addition to 0°C is described.
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Additional information
Translated from Izmeritel’naya Tekhnika, No. 11, pp. 39–43, November, 2004.
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Moiseeva, N.P. Investigation of the interpolation relations for a Platinum resistance thermometer over narrow temperature ranges. Meas Tech 47, 1090–1095 (2004). https://doi.org/10.1007/s11018-004-0012-x
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DOI: https://doi.org/10.1007/s11018-004-0012-x