ASTM E207-08
(Test Method)Standard Test Method for Thermal EMF Test of Single Thermoelement Materials by Comparison with a Reference Thermoelement of Similar EMF-Temperature Properties
Standard Test Method for Thermal EMF Test of Single Thermoelement Materials by Comparison with a Reference Thermoelement of Similar EMF-Temperature Properties
SIGNIFICANCE AND USE
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.
This test method is employed mainly by providers of spools or coils of wire or strip of thermoelectric material. Generally more than one specimen at a time is tested, and the resultant emf of individual thermoelements are used to match to companion thermoelements for use as thermocouples or in extension wiring.
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 E 220, but Test Method E 220 does not take into account the values of the emf of the individual thermoelements relative to Pt-67.
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.
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 emf of a thermoelement versus 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 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 E 230 lists the ranges associated with the letter-designated types of thermocouples. ASTM MNL-12 lists the temperature range of extension circuit materials.
1.3 This test 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.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: E207 − 08
StandardTest Method for
Thermal EMF Test of Single Thermoelement Materials by
Comparison with a Reference Thermoelement of Similar
1
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E220Test Method for Calibration of Thermocouples By
Comparison Techniques
1.1 This test method covers a test for determining the
E230Specification and Temperature-Electromotive Force
thermoelectric emf of a thermoelement versus NIST platinum
(EMF) Tables for Standardized Thermocouples
67 (Pt-67) by means of measuring the difference between the
E344Terminology Relating to Thermometry and Hydrom-
emf of the test thermoelement and the emf of a reference
etry
thermoelement (previously referred to as a secondary
E563Practice for Preparation and Use of an Ice-Point Bath
standard), which has a known relationship to NIST Pt-67.
as a Reference Temperature
1.2 This test is applicable to new thermocouple materials
over the temperature ranges normally associated with thermo-
3. Terminology
couples and their extension wires. The table on Suggested
Upper Temperature Limits for Protected Thermocouples in
3.1 Definitions—The terms used in this test method are
Specification E230 lists the ranges associated with the letter-
defined in Terminology E344.
2
designated types of thermocouples. ASTM MNL-12 lists the
3.2 Definitions of Terms Specific to This Standard:
temperature range of extension circuit materials.
3.2.1 reference facility, n—NIST, or a testing laboratory
1.3 This test is not applicable to stability testing or inhomo-
whose physical standards are traceable to NIST or another
geneity testing.
national standards laboratory.
1.4 The values stated in SI units are to be regarded as the
3.2.2 test temperature, n—the temperature of the measuring
standard. The values given in parentheses are for information
junction.
only.
3.2.2.1 Discussion—Inreportingtheresults,thevalueofthe
1.5 This standard does not purport to address all of the
test temperature may be rounded off, provided the stated test
safety concerns, if any, associated with its use. It is the
temperature is within the bounds indicated in 10.10.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Summary of Test Method
bility of regulatory limitations prior to use.
4.1 The emf of a thermoelement sample is determined by
2. Referenced Documents
comparison to a reference thermoelement that has similar
3
2.1 ASTM Standards:
Seebeck coefficients.
E77Test Method for Inspection and Verification of Ther-
4.2 This test is conducted on one or more lengths of
mometers
specimens connected to a single length of the reference
thermoelementatasinglepoint.Thejoinedendsareheldatthe
1
This test method is under the jurisdiction of ASTM Committee E20 on
test temperature, and their opposite ends are held at a constant
Temperature Measurement and is the direct responsibility of Subcommittee E20.04
reference temperature.
on Thermocouples.
Current edition approved May 1, 2008. Published June 2008. Originally
4.3 The emf of the reference thermoelement relative to
approved in 1962 . Last previous edition approved in 2000 as E207–00. DOI:
10.1520/E0207-08.
Pt-67 at several test temperatures are provided by a reference
2
Manual on the Use of Thermocouples in Temperature Measurement, ASTM
facility.
MNL-12, Fourth Edition, ASTM, April 1993. (Revision of STP 407B).
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4.4 The emf of the test thermoelement relative to Pt-67 is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
determined by algebraically adding the measured emf to the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. emf of the reference thermoelement at each test temperature.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E207 − 08
5. Significance and Use 7. Reference Thermoelement
5.1 This test method is designed to calibrate a thermoele-
7.1 The reference thermoelement has its emf established
ment at one or more test temperatures. The data obtained are
relative to NIST Pt-67 over the temperature range of its
sometimes referred to as initial values of emf because the time
intended use. A specific lot of thermoelement material is
at the test temperature is limited.
usually reserved for use as re
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
Designation:E207–00 Designation:E207–08
Standard Test Method for
Thermal EMF Test of Single Thermoelement Materials by
Comparison with a Reference Thermoelement of Similar
1
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a test for determining the thermoelectric emf of a thermoelement versus NISTplatinum 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 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
2
lists the ranges associated with the letter-designated types of thermocouples. ASTM MNL-12 lists the temperature range of
extension circuit materials.
1.3 This test 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.
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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 ASTM Standards:
E77 Test Method for Inspection and Verification of Thermometers
E220 Test Method for Calibration of Thermocouples byBy Comparison Techniques
E230 Specification forand 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.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 reference facility, n—NIST, or a testing laboratory whose physical standards are traceable to NIST or another national
standards laboratory.
3.2.2 test temperature, n—the temperature of the measuring junction.
3.2.2.1 Discussion—In reporting the results, the value of the test temperature may be rounded off, provided the stated test
temperature is within the bounds indicated in 10.10.
4. Summary of Test Method
4.1 The emf of a thermoelement sample is determined by comparison to a reference thermoelement that has similar Seebeck
coefficients.
4.2 This test is conducted on one or more lengths of specimens connected to a single length of the reference thermoelement at
asinglepoint.Thejoinedendsareheldatthetesttemperature,andtheiroppositeendsareheldataconstantreferencetemperature.
1
This test method is under the jurisdiction of ASTM Committee E20 on Temperature Measurement and is the direct responsibility of Subcommittee E20.04 on
Thermocouples.
Current edition approved Aug. 10, 2000. Published September 2000. Originally published as E207–62 T. Last previous edition E207–96.
Current edition approved May 1, 2008. Published June 2008. Originally approved in 1962 . Last previous edition approved in 2000 as E207–00.
2
Manual on the Use of Thermocouples in Temperature Measurement, ASTM MNL-12, Fourth Edition, ASTM, April 1993. (Revision of STP 407B).
3
ForreferencedASTMstandards,visittheASTMwebsite,www.astm.org,orcontactASTMCustomerServiceatservice@astm.org.For Annual Book of ASTM Standards
, Vol 14.03.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 ----------------------
E207–08
4.3 The emf of the reference thermoelement relative to Pt-67 at several test temperatures are provided by a reference facility.
4.4 The emf of the test thermoelement relative to Pt-67 is determined by algebraically adding the measured emf to the emf of
the reference thermoelement at each test temperature.
5. Significance and Use
5.1 Thistestmethodisdesignedtocalibrateathermoelementato
...
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