ASTM E1502-22
Standard Guide for Use of Fixed-Point Cells for Reference Temperatures

Standard No.

ASTM E1502-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E1502-22

Scope

1.1 This guide describes the essential features of fixed-point cells and auxiliary apparatus, and the techniques required to realize fixed points in the temperature range from 29 °C to 1085 °C.3 1.2 Design and construction requirements of fixed-point cells are not addressed in this guide. Typical examples are given in Figs. 1 and 2. 1.3 This guide is intended to describe good practice and establish uniform procedures for the realization of fixed points. 1.4 This guide emphasizes principles. The emphasis on principles is intended to aid the user in evaluating cells, in improving technique for using cells, and in establishing procedures for specific applications. 1.5 For the purposes of this guide, the use of fixed-point cells for the accurate calibration of thermometers is restricted to immersion-type thermometers that, when inserted into the reentrant well of the cell, (1) indicate the temperature only of the isothermal region of the well, and (2) do not significantly alter the temperature of the isothermal region of the well by heat transfer. 1.6 This guide does not address all of the details of thermometer calibration. 1.7 This guide is intended to complement special operating instructions supplied by manufacturers of fixed-point apparatus. 1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.9 The following hazard caveat pertains only to the test method portion, Section 7, of this guide. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 1 This guide is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.07 on Fundamentals in Thermometry. Current edition approved June 1, 2022. Published July 2022. Originally approved in 1992. Last previous edition approved in 2016 as E1502 – 16. DOI: 10.1520/ E1502-22. 2 Preston-Thomas, H., “The International Temperature Scale of 1990 (ITS-90),” Metrologia, Vol 27, No. 1, 1990, pp. 3–10. For errata see ibid, Vol 27, No. 2, 1990, p. 107. 3 In this guide, temperature intervals are expressed in kelvins (K) and millikelvins (mK). Values of temperature are expressed in degrees Celsius (°C), ITS-90. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 1 2. Referenced Documents

ASTM E1502-22 Referenced Document

• ASTM E344 Terminology Relating to Thermometry and Hydrometry*， 2023-12-01 Update
• ASTM E644 Standard Test Methods for Testing Industrial Resistance Thermometers

ASTM E1502-22 history

• 2022 ASTM E1502-22 Standard Guide for Use of Fixed-Point Cells for Reference Temperatures
• 2016 ASTM E1502-16 Standard Guide for Use of Fixed-Point Cells for Reference Temperatures
• 2010 ASTM E1502-10 Standard Guide for Use of Freezing-Point Cells for Reference Temperatures
• 1998 ASTM E1502-98(2003)e1 Standard Guide for Use of Freezing-Point Cells for Reference Temperatures
• 1998 ASTM E1502-98 Standard Guide for Use of Freezing-Point Cells for Reference Temperatures