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Stability of Small Industrial Platinum Resistance Thermometers
1National Bureau of Standards, Gaithersburg, MD 20899.
Abstract:
This paper reports the results of an investigation of the stability of a selection of small industrial platinum resistance thermometers (IPRTs) upon heat treatment and handling. Ninety-four IPRTs, of several models, obtained from five manufacturers were studied. Most of the IPRTs exhibited calibration drifts and also effects due to the presence of moisture or strain. There was no apparent improvement in the stability if the resistance ratio, R(t)/R 0= W(t), instead of resistance were used as the criterion. Comparisons are made of the relative stability of the products of the five companies.
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