ASTM E1751/E1751M-20

Standard Guide for Temperature Electromotive Force (emf) Tables for Non-Letter Designated Thermocouple Combinations

General Information

• Status: Published
• Publication Date: 14-Nov-2020
• 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: E1751/E1751M − 20 An American National Standard
Standard Guide for
Temperature Electromotive Force (emf) Tables for Non-
1
Letter Designated Thermocouple Combinations
ThisstandardisissuedunderthefixeddesignationE1751/E1751M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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. Scope 3.1.1 For definitions of terms used in this guide see Termi-
nology E344.
1.1 This guide consists of reference tables that give
3.2 Definitions of Terms Specific to This Standard:
temperature-electromotive force (emf) relationships for special
3.2.1 matched pairs, n—a set of positive and negative
purpose limited-use, thermocouple combinations that do not
thermoelements chosen so that a thermocouple fabricated from
have a letter designation.
these thermoelements will match a specified temperature-
1.2 Extension wire or compensating extension wires are not
electromotive force relationship to within a specified tolerance,
2
covered by this guide. ASTM MNL12 or thermocouple alloy
at the time of initial use.
suppliers should be consulted.
1.3 The values stated in either SI units or inch-pound units
4. Source of Data
are to be regarded separately as standard. The values stated in
4.1 The data in these tables are based on the SI Volt and the
each system may not be exact equivalents; therefore, each
International Temperature Scale of 1990.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
4.2 All temperature-electromotive force data in Tables 1-20
with the standard.
have been developed from National Institute of Standards and
1.4 This international standard was developed in accor-
Technology (NIST), Nuclear Regulatory Committee (NRC),
dance with internationally recognized principles on standard-
and wire manufacturers’ data.
ization established in the Decision on Principles for the
4.3 Tables 1-16 give emf values in millivolts to three
Development of International Standards, Guides and Recom-
decimal places (1 µV) at 1 °C or 1 °F intervals. Tables 17-20
mendations issued by the World Trade Organization Technical
give emf values in microvolts to one decimal place (0.1 µV) at
Barriers to Trade (TBT) Committee.
1 °C or 1 °F intervals. If greater precision is required, refer to
2. Referenced Documents the equation and coefficients listed for each thermocouple
3 alloy.
2.1 ASTM Standards:
E344 Terminology Relating to Thermometry and Hydrom-
5. Significance and Use
etry
E696 Specification for Tungsten-Rhenium Alloy Thermo-
5.1 The thermocouple combinations have been developed
couple Wire
for specific applications by the wire manufacturer(s). If addi-
tional information is required, consult ASTM MNL12 or the
3. Terminology
wire manufacturer(s).
3.1 Definitions:
6. Thermocouple Types
1
This guide is under the jurisdiction of ASTM Committee E20 on Temperature 6.1 Letter symbols have not been assigned. Identification is
Measurement and is the direct responsibility of Subcommittee E20.11 on Thermo-
madebyalloycompositionwiththethermoelectricallypositive
couples - Calibration.
material listed first.
Current edition approved Nov. 15, 2020. Published January 2021. Originally
approved in 1995. Last previous edition approved in 2015 as E1751/E1751M – 15. 6.1.1 Tungsten versus tungsten-26 % rhenium.
DOI: 10.1520/E1751_E1751M-20.
6.1.2 Tungsten-3 % rhenium versus tungsten-25 % rhe-
2
Manual on the Use of Thermocouples in Temperature Measurement, ASTM
nium.
MNL12, ASTM International, 1993.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
NOTE 1—Tungsten-3 % rhenium versus tungsten-25% rhenium is com-
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on monly referred to as type “D” amongst suppliers, although not officially
the ASTM website. designated.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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E1751/E1751M − 20
6.1.3 Palladium-55 % platinum 31 % gold 14 % versus gold
Table 9 Platinum-5 % Molybdenum versus 0 to 1600 °C
4
Platinum-0.1 % Molybdenum
65 % palladium 35 %.
Table 10 Platinum-5 % Molybdenum versus 32 to 2912 °F
6.1.4 KP versus gold-0.07 % iron.
Platinum-0.1 % Molybdenum
Table 11 Platinum-40 % Rhodium versus 0 to 1888 °C
NOTE 2—Alloy compositions are expressed in percentag
...

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.
Designation: E1751/E1751M − 15 E1751/E1751M − 20
Standard Guide for
Temperature Electromotive Force (emf) Tables for Non-
1
Letter Designated Thermocouple Combinations
This standard is issued under the fixed designation E1751/E1751M; 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. Scope
1.1 This guide consists of reference tables that give temperature-electromotive force (emf) relationships for special purpose,
limited use, purpose limited-use, thermocouple combinations that do not have a letter designation.
2
1.2 Extension wire or compensating extension wires are not covered by this guide. ASTM MNL 12MNL12 or thermocouple alloy
suppliers should be consulted.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.4 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:
E344 Terminology Relating to Thermometry and Hydrometry
E696 Specification for Tungsten-Rhenium Alloy Thermocouple Wire
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this guide see Terminology E344.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 matched pairs, n—a set of positive and negative thermoelements chosen so that a thermocouple fabricated from these
thermoelements will match a specified temperature-electromotive force relationship to within a specified tolerance, at the time of
firstinitial use.
1
This guide 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, 2015Nov. 15, 2020. Published June 2015January 2021. Originally approved in 1995. Last previous edition approved in 20092015 as
ε1
E1751_E1751M – 09E1751/E1751M – 15. . DOI: 10.1520/E1751_E1751M-15.10.1520/E1751_E1751M-20.
2
“Manual on the Use of Thermocouples in Temperature Measurement,” ASTM Manual, 12, ASTM, 1993. Manual on the Use of Thermocouples in Temperature
Measurement, ASTM MNL12, ASTM International, 1993.
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 ----------------------
E1751/E1751M − 20
4. Source of Data
4.1 The data in these tables are based on the SI Volt and the International Temperature Scale of 1990.
4.2 All temperature–electromotivetemperature-electromotive force data in Tables 1-20 have been developed from NIST, NRC, and
wire manufacturers’National Institute of Standards and Technology (NIST), Nuclear Regulatory Committee (NRC), and wire
manufacturers’ data.
4.3 Tables 1-16 give emf values in millivolts to three decimal places (1 μV) at 1°C1 °C or 1°F1 °F intervals. Tables 17-20 give
emf values in microvolts to one decimal place (0.1 μV) at 1°C or 1°F 1 °C or 1 °F intervals. If greater precision is required, refer
to the equation and coefficients listed for each thermocouple alloy.
5. Significance and Use
5.1 TheseThe thermocouple combinations have been developed for specific applications by the wire manufacturer(s). If additional
information is required, consult ASTM MNL 12 MNL12 or the wire manufacturer. manufacturer(s).
6. Thermocouple Types
6.1 Letter symbols have not been assigned. Identification is made by alloy composition with the thermoelectrically positive
material listed first.
6.1.1 Tungsten versus tungsten-26 % rhenium.
6.1.2 Tungsten-3 % rhenium versus tungsten-25 % rhenium.
NOTE 1—Tungsten-3 % rhenium versus tungsten-25% rhenium is commonly referred to as type “D” amongst suppliers,
...