ASTM E207-21

Standard Test Method for Thermal EMF Test of Single Thermoelement Materials by Comparison With Reference Thermoelement of Similar EMF-Temperature Properties

SIGNIFICANCE AND USE
5.1 This test method is designed to calibrate a thermoelement at one or more test temperatures. The data obtained are sometimes referred to as initial values of emf because the time at the test temperature is limited.  
5.2 This test method is employed mainly by providers of spools or coils of wire or strips of thermoelectric material. Generally more than one specimen at a time is tested, and the resultant emfs of individual thermoelements are used to match to companion thermoelements for use as thermocouples or in extension wiring.  
5.3 The emf of a thermocouple comprised of two different thermoelements as tested with this test method may be determined by algebraically subtracting the emf of the negative thermoelement from the emf of the positive thermoelement at a particular temperature. The emf of a thermocouple may also be determined by the test described in Test Method E220, but Test Method E220 does not take into account the values of the emf of the individual thermoelements relative to Pt-67.  
5.4 This test method is normally used for the calibration of thermocouple materials during their production or distribution, not for the accurate determination of the properties of a used thermocouple. If the test samples were subjected to previous use, the test results may not reflect the same emf as the thermocouple did while in service. For example, inhomogeneities may have been induced in the wires because of a chemical or metallurgical reaction while in service. Since emf is developed in the thermal gradient, and it is unlikely that the temperature profile along the wire under testing conditions will be the same as it was while in service, the test results may be misleading.  
5.5 The test results are suitable for specification acceptance, manufacturing control, design, or research and development purposes.
SCOPE
1.1 This test method covers a test for determining the thermoelectric electromotive force (emf) of a thermoelement versus National Instruments of Standards and Technology (NIST) platinum 67 (Pt-67) by means of measuring the difference between the emf of the test thermoelement and the emf of a reference thermoelement (previously referred to as a secondary standard), which has a known relationship to NIST Pt-67.  
1.2 This test method is applicable to new thermocouple materials over the temperature ranges normally associated with thermocouples and their extension wires. The table on Suggested Upper Temperature Limits for Protected Thermocouples in Specification E230/E230M lists the ranges associated with the letter-designated types of thermocouples. ASTM MNL122 lists the temperature range of extension circuit materials.  
1.3 This test method is not applicable to stability testing or inhomogeneity testing.  
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.5 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.  
1.6 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.

General Information

• Status: Published
• Publication Date: 30-Apr-2021
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: E20 - Temperature Measurement
• Drafting Committee: E20.11 - Thermocouples - Calibration

Standards Content (Sample)

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.
Designation: E207 − 21 An American National Standard
Standard Test Method for
Thermal EMF Test of Single Thermoelement Materials by
Comparison With Reference Thermoelement of Similar EMF-
1
Temperature Properties
This standard is issued under the fixed designation E207; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
3
1.1 This test method covers a test for determining the 2.1 ASTM Standards:
thermoelectric electromotive force (emf) of a thermoelement E77Test Method for Inspection and Verification of Ther-
versus National Instruments of Standards and Technology mometers
(NIST) platinum 67 (Pt-67) by means of measuring the E220Test Method for Calibration of Thermocouples By
difference between the emf of the test thermoelement and the Comparison Techniques
emf of a reference thermoelement (previously referred to as a E230/E230MSpecification for Temperature-Electromotive
secondary standard), which has a known relationship to NIST Force (emf) Tables for Standardized Thermocouples
Pt-67. E344Terminology Relating to Thermometry and Hydrom-
etry
1.2 This test method is applicable to new thermocouple
E563Practice for Preparation and Use of an Ice-Point Bath
materialsoverthetemperaturerangesnormallyassociatedwith
as a Reference Temperature
thermocouples and their extension wires. The table on Sug-
gestedUpperTemperatureLimitsforProtectedThermocouples
3. Terminology
in Specification E230/E230M lists the ranges associated with
2
3.1 Definitions:
the letter-designated types of thermocouples. ASTM MNL12
3.1.1 The terms used in this test method are defined in
lists the temperature range of extension circuit materials.
Terminology E344.
1.3 This test method is not applicable to stability testing or
3.2 Definitions of Terms Specific to This Standard:
inhomogeneity testing.
3.2.1 lot, n—a quantity of thermocouple material manufac-
1.4 The values stated in SI units are to be regarded as
tured from the same batch, assembled and processed together
standard. The values given in parentheses after SI units are
under controlled production conditions having uniform char-
providedforinformationonlyandarenotconsideredstandard.
acteristics.
1.5 This standard does not purport to address all of the
3.2.2 reference facility, n—NIST, or a testing laboratory
safety concerns, if any, associated with its use. It is the
whose physical standards are traceable to NIST or another
responsibility of the user of this standard to establish appro-
national standards laboratory.
priate safety, health, and environmental practices and deter-
3.2.3 test temperature, n—the temperature of the measuring
mine the applicability of regulatory limitations prior to use.
junction.
1.6 This international standard was developed in accor-
3.2.3.1 Discussion—Inreportingtheresults,thevalueofthe
dance with internationally recognized principles on standard-
test temperature may be rounded off, provided the stated test
ization established in the Decision on Principles for the
temperature is within the bounds indicated in 10.10.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Summary of Test Method
Barriers to Trade (TBT) Committee.
4.1 The emf of a thermoelement sample is determined by
comparison to a reference thermoelement that has similar
1
This test method is under the jurisdiction of ASTM Committee E20 on
Seebeck coefficients.
Temperature Measurement and is the direct responsibility of Subcommittee E20.11
on Thermocouples - Calibration.
CurrenteditionapprovedMay1,2021.PublishedJuly2021.Originallyapproved
ε1
3
in 1962 . Last previous edition approved in 2015 as E207–08 (2015) . DOI: For referenced ASTM standards, visit the ASTM website, www.astm.org, or
10.1520/E0207-21. contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
2
Manual on the Use of Thermocouples in Temperature Measurement, Fourth Standards volume information, refer to the standard’s Document Summary page on
Edition, MNL12, ASTM International, 1993. (Revision of STP 407B). the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E207 − 21
4.2 Thistestmethodisconductedononeormorelengthsof 6.3 The specimens shall be cleaned of any extraneous
specimens connected to a single length of the refere
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation: E207 − 08 (Reapproved 2015) E207 − 21 An American National Standard
Standard Test Method for
Thermal EMF Test of Single Thermoelement Materials by
Comparison with a With Reference Thermoelement of
1
Similar EMF-Temperature Properties
This standard is issued under the fixed designation E207; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Editorial changes were made throughout in June 2015.
1. Scope
1.1 This test method covers a test for determining the thermoelectric emf electromotive force (emf) of a thermoelement versus
NIST National Instruments of Standards and Technology (NIST) platinum 67 (Pt-67) by means of measuring the difference
between the emf of the test thermoelement and the emf of a reference thermoelement (previously referred to as a secondary
standard), which has a known relationship to NIST Pt-67.
1.2 This test method is applicable to new thermocouple materials over the temperature ranges normally associated with
thermocouples and their extension wires. The table on Suggested Upper Temperature Limits for Protected Thermocouples in
Specification E230E230/E230M lists the ranges associated with the letter-designated types of thermocouples. ASTM MNL-
2
12MNL12 lists the temperature range of extension circuit materials.
1.3 This test method is not applicable to stability testing or inhomogeneity testing.
1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. after
SI units are provided for information only and are not considered standard.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 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.
2. Referenced Documents
3
2.1 ASTM Standards:
E77 Test Method for Inspection and Verification of Thermometers
1
This test method is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.11 on
Thermocouples - Calibration.
Current edition approved May 1, 2015May 1, 2021. Published May 2015July 2021. Originally approved in 1962 . Last previous edition approved in 20082015 as
ε1
E207 – 08.E207 – 08 (2015) . DOI: 10.1520/E0207-08R15E01.10.1520/E0207-21.
2
Manual on the Use of Thermocouples in Temperature Measurement, ASTM MNL-12,Fourth Edition, MNL12, Fourth Edition, ASTM, April ASTM International, 1993.
(Revision of STP 407B).
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
E207 − 21
E220 Test Method for Calibration of Thermocouples By Comparison Techniques
E230E230/E230M Specification for 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
3. Terminology
3.1 Definitions—The terms used in this test method are defined in Terminology E344.
3.1 Definitions:
3.1.1 The terms used in this test method are defined in Terminology E344.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 lot, n—a quantity of thermocouple material manufactured from the same batch, assembled and processed together under
controlled production conditions having uniform characteristics.
3.2.2 reference facility, n—NIST, or a testing laboratory whose physical standards are traceable to NIST or another national
standards laboratory.
3.2.3 test temperature, n—the temperature of the measuring junction
...