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Sixty-five standard platinum resistance thermometers (SPRTs) in the range 0 °C to 660.323 °C were investigated. The results show fifty-eight SPRTs with non-uniqueness less than 1.0 mK in one distribution and the remaining seven SPRTs with non-uniqueness much greater than 1.0 mK in a separate distribution. The results suggest that the non-uniqueness of the SPRTs should be controlled within 1 mK. The results also suggest that in the sub-range 0 °C to 419.527 °C non-uniqueness is determined solely by the coefficient c of the interpolation equation for SPRTs in the range 0 °C to 660.323 °C. A simple formula is given relating the non-uniqueness and a coefficient c , which can be conveniently used to assess the quality of SPRTs.
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Zhiru et al. (2002) studied this question.
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