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Large Fixed-Point Cells Large SRM fixed-point cells containing either high purity (>99.9999% pure) Sn and Zn and were developed for use as ITS-90 defining fixed-point cells to calibrate (HT)SPRTs. They are designated as SRM 1747 (Sn freezing-point cell) and SRM 1748 (Zn freezing-point cell). They, together with the triple point of water cell, are used to calibrate SPRTs from 0 °C to 420 °C, used for part of the calibration of SPRTs from 0 °C to 661 °C, or used for part of the calibration of HTSPRTs from 0 °C to 962 °C.
ITS-90 Defining Fixed-Point Cells
FP = freezing point *PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE Technical contact: gregory.strouse@nist.gov
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Last Updated on: 2/25/04
