标准铂电阻温度计校准实验室
The SPRTCL provides an extensive list of calibration services that cover the whole temperature range for which long-stem SPRTs, including high-temperature SPRTs, are the ITS-90 interpolation artifacts. This range spans from the triple point of argon (-189.3442 °C) to the freezing point of silver (961.78 °C). The laboratory also provides calibrations of capsule-type SPRTs in a limited temperature range, from the triple point of argon up to the freezing point of tin (231.928 °C). The SPRTs are calibrated by employing fixed-point cells, artifacts that realize the ITS-90 by enclosing high-purity materials (99.9999% or more) for which the phase transition temperatures (melting, freezing or triple points) are known with extreme accuracy. Such temperatures are the defining ITS-90 fixed points, and SPRTs are calibrated at combinations of these fixed points that correspond to the desired ITS-90 subrange. The fixed points realized by the SPRTCL are:Fixed pointT, KT, °CUncertainty, mK (k=2)
Triple point of argon83.8058-189.34420.14
Triple point of mercury234.3156-38.83440.15
Triple point of water273.160.010.09
Melting point of gallium302.914629.76460.13
Freezing point of indium429.7485156.59850.25
Freezing point of tin505.078231.9280.27
Freezing point of zinc692.677419.5270.55
Freezing point of aluminum933.473660.323TBD
Freezing point of silver1234.93961.78TBD
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