ASTM E230/E230M-11
(Specification)Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples
ABSTRACT
This specification contains reference tables that give temperature-electromotive force (emf) relationships for types B, E, J, K, N, R, S, T, and C thermocouples. These are the thermocouple types most commonly used in industry. Thermocouples and matched thermocouple wire pairs are normally supplied to the tolerances on initial values of emf versus temperature. Color codes for insulation on thermocouple grade materials, along with corresponding thermocouple and thermoelement letter designations are given. Four types of tables are presented: general tables, EMF versus temperature tables for thermocouples, EMF versus temperature tables for thermoelements, and supplementary tables.
SCOPE
1.1 This specification contains reference tables (Tables 8 to 25) that give temperature-electromotive force (emf) relationships for Types B, E, J, K, N, R, S, T, and C thermocouples. These are the thermocouple types most commonly used in industry. The tables contain all of the temperature-emf data currently available for the thermocouple types covered by this standard and may include data outside of the recommended upper temperature limit of an included thermocouple type.
1.2 In addition, the specification includes standard and special tolerances on initial values of emf versus temperature for thermocouples (Table 1), thermocouple extension wires (Table 2), and compensating extension wires for thermocouples (Table 3). Users should note that the stated tolerances apply only to the temperature ranges specified for the thermocouple types as given in Tables 1, 2, and 3, and do not apply to the temperature ranges covered in Tables 8 to 25.
1.3 Tables 4 and 5 provide insulation color coding for thermocouple and thermocouple extension wires as customarily used in the United States.
1.4 Recommendations regarding upper temperature limits for the thermocouple types referred to in 1.1 are provided in Table 6.
1.5 Tables 26 to 45 give temperature-emf data for single-leg thermoelements referenced to platinum (NIST Pt-67). The tables include values for Types BP, BN, JP, JN, KP (same as EP), KN, NP, NN, TP, and TN (same as EN).
1.6 Tables for Types RP, RN, SP, and SN thermoelements are not included since, nominally, Tables 18 to 21 represent the thermoelectric properties of Type RP and SP thermoelements referenced to pure platinum. Tables for the individual thermoelements of Type C are not included because materials for Type C thermocouples are normally supplied as matched pairs only.
1.7 Polynomial coefficients which may be used for computation of thermocouple emf as a function of temperature are given in Table 7. Coefficients for the emf of each thermocouple pair as well as for the emf of most individual thermoelements versus platinum are included. Coefficients for type RP and SP thermoelements are not included since they are nominally the same as for types R and S thermocouples, and coefficients for type RN or SN relative to the nominally similar Pt-67 would be insignificant. Coefficients for the individual thermoelements of Type C thermocouples have not been established.
1.8 Coefficients for sets of inverse polynomials are given in Table 46. These may be used for computing a close approximation of temperature (°C) as a function of thermocouple emf. Inverse functions are provided only for thermocouple pairs and are valid only over the emf ranges specified.
1.9 This specification is intended to define the thermoelectric properties of materials that conform to the relationships presented in the tables of this standard and bear the letter designations contained herein. Topics such as ordering information, physical and mechanical properties, workmanship, testing, and marking are not addressed in this specification. The user is referred to specific standards such as Specifications E235, E574, E585/E585M, E608/E608M, E1159, or E2181/E2181M for guidance in these areas.
1.10 The temperature-emf data in this specification are ...
General Information
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation: E230/E230M – 11
Standard Specification and
Temperature-Electromotive Force (emf) Tables for
1
Standardized Thermocouples
This standard is issued under the fixed designation E230/E230M; 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 1.6 Tables for Types RP, RN, SP, and SN thermoelements
arenotincludedsince,nominally,Tables18to21representthe
1.1 This specification contains reference tables (Tables8 to
thermoelectric properties of Type RP and SP thermoelements
25) that give temperature-electromotive force (emf) relation-
2 referenced to pure platinum. Tables for the individual thermo-
ships for Types B, E, J, K, N, R, S, T, and C thermocouples.
elementsofTypeCarenotincludedbecausematerialsforType
These are the thermocouple types most commonly used in
C thermocouples are normally supplied as matched pairs only.
industry. The tables contain all of the temperature-emf data
1.7 Polynomial coefficients which may be used for compu-
currently available for the thermocouple types covered by this
tation of thermocouple emf as a function of temperature are
standard and may include data outside of the recommended
giveninTable7.Coefficientsfortheemfofeachthermocouple
upper temperature limit of an included thermocouple type.
pair as well as for the emf of most individual thermoelements
1.2 In addition, the specification includes standard and
versus platinum are included. Coefficients for type RP and SP
special tolerances on initial values of emf versus temperature
thermoelements are not included since they are nominally the
for thermocouples (Table1), thermocouple extension wires
same as for types R and S thermocouples, and coefficients for
(Table2), and compensating extension wires for thermo-
typeRNorSNrelativetothenominallysimilarPt-67wouldbe
couples (Table3). Users should note that the stated tolerances
insignificant. Coefficients for the individual thermoelements of
apply only to the temperature ranges specified for the thermo-
Type C thermocouples have not been established.
coupletypesasgiveninTables1,2,and3,anddonotapplyto
1.8 Coefficients for sets of inverse polynomials are given in
the temperature ranges covered in Tables8 to 25.
Table46. These may be used for computing a close approxi-
1.3 Tables 4 and 5 provide insulation color coding for
mation of temperature (°C) as a function of thermocouple emf.
thermocouple and thermocouple extension wires as customar-
Inversefunctionsareprovidedonlyforthermocouplepairsand
ily used in the United States.
are valid only over the emf ranges specified.
1.4 Recommendations regarding upper temperature limits
1.9 This specification is intended to define the thermoelec-
for the thermocouple types referred to in 1.1 are provided in
tric properties of materials that conform to the relationships
Table6.
presented in the tables of this standard and bear the letter
1.5 Tables26to45givetemperature-emfdataforsingle-leg
designations contained herein. Topics such as ordering infor-
thermoelements referenced to platinum (NIST Pt-67). The
mation, physical and mechanical properties, workmanship,
tables include values for Types BP, BN, JP, JN, KP (same as
testing,andmarkingarenotaddressedinthisspecification.The
EP), KN, NP, NN, TP, and TN (same as EN).
user is referred to specific standards such as Specifications
E235, E574, E585/E585M, E608/E608M, E1159,or E2181/
E2181M for guidance in these areas.
1
These tables are under the jurisdiction ofASTM Committee E20 on Tempera-
1.10 The temperature-emf data in this specification are
ture Measurement and are the direct responsibility of Subcommittee E20.04 on
intended for industrial and laboratory use.
Thermocouples.
1.11 Thermocouple color codes per IEC584–3 are given in
Current edition approved May 15, 2011. Published August 2011. Originally
approved in 1963. Last previous edition approved in 2003 as E230–03. DOI:
Appendix X1.
10.1520/E0230_E0230M-11.
1.12 The values stated in either SI units or inch-pound units
2
These temperature-emf relationships have been revised as required by the
are to be regarded separately as standard. The values stated in
international adoption in 1989 of a revised International Temperature Scale
(ITS-90). each system may not be exact equivalents; therefore, each
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
E230/E230M – 11
system shall be used independently of the other. Combining are satisfactory for most industrial uses but may not be
values f
...
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.
An American National Standard
Designation:E230–03 Designation: E230/E230M – 11
Standard Specification and
Temperature-Electromotive Force (EMF)(emf) Tables for
1
Standardized Thermocouples
This standard is issued under the fixed designation E230/E230M; 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.
Note—Paragraph 1.1, and Tables7, 13, 19, 21, and 46 were editorially corrected and the year date changed on Sept. 23, 2003.
1. Scope
1.1 This specification contains reference tables (Tables8– to 25) that give temperature-electromotive force (emf) relationships
2
for Types B, E, J, K, N, R, S, T, and C thermocouples. These are the thermocouple types most commonly used in industry.
1.2Also included are lists of standard and special tolerances on initial values of emf versus temperature for thermocouples
(Table1), thermocouple extension wires (Table2), and compensating extension wires for thermocouples (Table3).
1.3Tables4–5, included herein, give data on insulation color coding for thermocouple and thermocouple extension wires as
customarily used in the United States. These are the thermocouple types most commonly used in industry. The tables contain all
of the temperature-emf data currently available for the thermocouple types covered by this standard and may include data outside
of the recommended upper temperature limit of an included thermocouple type.
1.2 In addition, the specification includes standard and special tolerances on initial values of emf versus temperature for
thermocouples (Table1), thermocouple extension wires (Table2), and compensating extension wires for thermocouples (Table3).
Users should note that the stated tolerances apply only to the temperature ranges specified for the thermocouple types as given in
Tables1, 2, and 3, and do not apply to the temperature ranges covered in Tables8 to 25.
1.3 Tables 4 and 5 provide insulation color coding for thermocouple and thermocouple extension wires as customarily used in
the United States.
1.4 Recommendations regarding upper temperature limits for the thermocouple types referred to in 1.1 are givenprovided in
Table6.
1.5 Tables26– to 45 give temperature-emf data for single-leg thermoelements referenced to platinum (NISTPt-67).The tables
include values for Types BP, BN, JP, JN, KP (same as EP), KN, NP, NN, TP, and TN (same as EN).
1.6 Tables for Types RP, RN, SP, and SN thermoelements are not included since, nominally, Tables18– to 21 represent the
thermoelectricpropertiesofTypeRPandSPthermoelementsreferencedtopureplatinum.Tablesfortheindividualthermoelements
of Type C are not included because materials for Type C thermocouples are normally supplied as matched pairs only.
1.7 Polynomialcoefficientsthatwhichmaybeusedforcomputationofthermocoupleemfasafunctionoftemperaturearegiven
in Table7. Coefficients for the emf of each thermocouple pair as well as for the emf of most individual thermoelements versus
platinum are included. Coefficients for type RPand SPthermoelements are not included since they are nominally the same as for
thetypesRandSthermocouples,andcoefficientsfortypeRNorSNrelativetothenominallysimilarPt-67wouldbeinsignificant.
Coefficients for the individual thermoelements of typeType C are thermocouples have not been established.
1.8 Coefficients for sets of inverse polynomials are given in Table44.Table46. These may be used for computing a close
approximation of temperature (°C) as a function of thermocouple emf. Inverse functions are provided only for thermocouple pairs
and are valid only over the emf ranges specified.
1.9 Thisspecificationisintendedtodefinethethermoelectricpropertiesofmaterialsthatconformtotherelationshipspresented
in the tables of this standard and bear the letter designations contained herein. Topics such as ordering information, physical and
mechanical properties, workmanship, testing, and marking are not addressed in this specification. The user is referred to specific
standards such as Specifications E235, E574, E585/E585M, E608, E608/E608M, E1159, or 1223, as appropriate, for guidance in
these areas. E2181/E2181M for guidance in these areas.
1.10 The temperature-emf data in this specification are intended for industrial and laboratory use.
1
These tables are under the jurisdiction of ASTM Committee E20 on Temperature Measurement and are the direct re
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.