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Small Fixed-Point Cells A series of six small, sealed fixed-point cells was developed to cover the temperature range from 29.7646 °C to 156.5985 °C for the purpose of calibrating small thermometers and for use as check points in which to verify the calibration of small thermometers. Initially, materials were chosen that have a freezing-point, melting-point, or a triple-point temperature, closely matching critical temperature values used in clinical, biomedical and pharmaceutical laboratories as reference- temperature check points. Additionally, these cells may be used for the calibration of thermometers (e.g. thermistors, diode thermometers, industrial-grade resistance thermometers) that do not adhere to the definition of the ITS-90. Two of these SRM cells (SRM 1968 and SRM 1971) contain high-purity metals that have defining fixed points on the ITS-90 and the other four are secondary fixed points. Small Fixed-Point Cells
MP = melting point FP = freezing point TP = triple point *PRICES ARE SUBJECT TO CHANGE WITHOUT NOTICE Technical contact: gregory.strouse@nist.gov
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Last Updated on: 2/25/04
