ASTM E2730 - 10(2015)e2

    Standard Practice for Calibration and Use of Thermocouple Reference Junction Probes in Evaluation of Electronic Reference Junction Compensation Circuits

    Active Standard ASTM E2730 | Developed by Subcommittee: E20.14

    Book of Standards Volume: 14.03

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    Significance and Use

    5.1 Many electronic instruments that are designed to be used with thermocouples use some method of reference junction compensation. In many industrial applications it may be impractical to use a physical ice bath as a temperature reference in a thermocouple circuit. The instrument must therefore be able to measure the temperature at the point of electrical connection of the thermocouple and either add or subtract voltage to give a corrected equivalent of what that thermocouple would indicate had there physically been 0°C reference junctions present in the circuit. There are two types of instruments that generally apply these techniques: electronic thermometer readouts that use a thermocouple as the sensor, and calibrators designed to calibrate these digital thermometer readouts. Additionally, the probe and circuit described in this guide can be used with a voltmeter to emulate a thermometer or a voltage source to calibrate temperature-indicating instrumentation. In all cases the probe must be calibrated if traceability or an uncertainty analysis, or both, is required.

    1. Scope

    1.1 This guide covers methods of calibration and use of thermocouple reference junction probes (cold junction compensation probes) in the evaluation of electronic reference junction compensation circuits. Their use with instruments that measure only voltage is also covered.

    1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    E220 Test Method for Calibration of Thermocouples By Comparison Techniques

    E230 Specification and Temperature-Electromotive Force (EMF) Tables for Standardized Thermocouples

    E344 Terminology Relating to Thermometry and Hydrometry

    E563 Practice for Preparation and Use of an Ice-Point Bath as a Reference Temperature

    E1129/E1129M Specification for Thermocouple Connectors


    E1750 Guide for Use of Water Triple Point Cells

    E2623 Practice for Reporting Thermometer Calibrations

    Other References

    ASTM MNL12 Manual On The Use Of Thermocouples In Temperature Measurement

    BIPM JCGM 100:2008

    NIST Monograph 175 Temperature-Electromotive Force Reference Functions and Tables for the Letter-Designated Thermocouple Types Based on the ITS-90

    ICS Code

    ICS Number Code 17.200.20 (Temperature-measuring instruments)

    Referencing This Standard
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    DOI: 10.1520/E2730-10R15E02

    Citation Format

    ASTM E2730-10(2015)e2, Standard Practice for Calibration and Use of Thermocouple Reference Junction Probes in Evaluation of Electronic Reference Junction Compensation Circuits, ASTM International, West Conshohocken, PA, 2015,

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