ASTM E230 E230M-2011e1 8125 Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶温度电动势关系表的标准规格》.pdf
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1、Designation: E230/E230M 111An American National StandardStandard Specification andTemperature-Electromotive Force (emf) Tables forStandardized Thermocouples1This standard is issued under the fixed designation E230/E230M; the number immediately following the designation indicates the yearof original
2、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.1NOTETable 46 was changed editorially in October 2011.1. Scope1.1 This specifica
3、tion contains reference tables (Tables 8 to25) that give temperature-electromotive force (emf) relation-ships for Types B, E, J, K, N, R, S, T, and C thermocouples.2These are the thermocouple types most commonly used inindustry. The tables contain all of the temperature-emf datacurrently available f
4、or the thermocouple types covered by thisstandard and may include data outside of the recommendedupper temperature limit of an included thermocouple type.1.2 In addition, the specification includes standard andspecial tolerances on initial values of emf versus temperaturefor thermocouples (Table 1),
5、 thermocouple extension wires(Table 2), and compensating extension wires for thermo-couples (Table 3). Users should note that the stated tolerancesapply only to the temperature ranges specified for the thermo-couple types as given in Tables 1, 2, and 3, and do not apply tothe temperature ranges cove
6、red in Tables 8 to 25.1.3 Tables 4 and 5 provide insulation color coding forthermocouple and thermocouple extension wires as customar-ily used in the United States.1.4 Recommendations regarding upper temperature limitsfor the thermocouple types referred to in 1.1 are provided inTable 6.1.5 Tables 26
7、 to 45 give temperature-emf data for single-legthermoelements referenced to platinum (NIST Pt-67). Thetables include values for Types BP, BN, JP, JN, KP (same asEP), KN, NP, NN, TP, and TN (same as EN).1.6 Tables for Types RP, RN, SP, and SN thermoelementsare not included since, nominally, Tables 18
8、 to 21 represent thethermoelectric properties of Type RP and SP thermoelementsreferenced to pure platinum. Tables for the individual thermo-elements of Type C are not included because materials for TypeC thermocouples are normally supplied as matched pairs only.1.7 Polynomial coefficients which may
9、be used for compu-tation of thermocouple emf as a function of temperature aregiven in Table 7. Coefficients for the emf of each thermocouplepair as well as for the emf of most individual thermoelementsversus platinum are included. Coefficients for type RP and SPthermoelements are not included since
10、they are nominally thesame as for types R and S thermocouples, and coefficients fortype RN or SN relative to the nominally similar Pt-67 would beinsignificant. Coefficients for the individual thermoelements ofType C thermocouples have not been established.1.8 Coefficients for sets of inverse polynom
11、ials are given inTable 46. These may be used for computing a close approxi-mation of temperature (C) as a function of thermocouple emf.Inverse functions are provided only for thermocouple pairs andare valid only over the emf ranges specified.1.9 This specification is intended to define the thermoele
12、c-tric properties of materials that conform to the relationshipspresented in the tables of this standard and bear the letterdesignations contained herein. Topics such as ordering infor-mation, physical and mechanical properties, workmanship,testing, and marking are not addressed in this specificatio
13、n.Theuser is referred to specific standards such as SpecificationsE235, E574, E585/E585M, E608/E608M, E1159,orE2181/E2181M for guidance in these areas.1.10 The temperature-emf data in this specification areintended for industrial and laboratory use.1.11 Thermocouple color codes per IEC 5843 are give
14、n inAppendix X1.1.12 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, each1These tables are under the jurisdiction of ASTM Committee E20 on Tempera-ture Measurement and are the
15、direct responsibility of Subcommittee E20.04 onThermocouples.Current edition approved May 15, 2011. Published October 2011. Originallyapproved in 1963. Last previous edition approved in 2003 as E230 03. DOI:10.1520/E0230_E0230M-11E01.2These temperature-emf relationships have been revised as required
16、 by theinternational adoption in 1989 of a revised International Temperature Scale(ITS-90).1Copyright. ASTM International, 100 Barr Harbour Dr., P.O. box C700 West Conshohocken, Pennsylvania 19428-2959, United StatesCopyright by ASTM Intl (all rights reserved); Wed Nov 2 21:56:38 EDT 2011Downloaded/
17、printed byGuo Dehua (CNIS) pursuant to License Agreement. No further reproductions authorized.system shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.13 This standard does not purport to address all of thesafety concerns,
18、 if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3E235 Specification for Thermocouples, Sheath
19、ed, Type Kand Type N, for Nuclear or for Other High-ReliabilityApplicationsE574 Specification for Duplex, Base Metal ThermocoupleWire With Glass Fiber or Silica Fiber InsulationE585/E585M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Base Metal ThermocoupleCableE608/E608M Specificat
20、ion for Mineral-Insulated, Metal-Sheathed Base Metal ThermocouplesE1159 Specification for Thermocouple Materials, Platinum-Rhodium Alloys, and PlatinumE2181/E2181M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Noble Metal Thermocouplesand Thermocouple Cable2.2 NIST Monograph:NIST Mo
21、nograph 175 Temperature-Electromotive ForceReference Functions and Tables for the Letter-DesignatedThermocouple Types Based on the ITS-9042.3 IEC Standard:IEC 5843 Thermocouples Part 3: Extension and Com-pensating Cables Tolerances and Identification System,19893. Source of Data3.1 The data in these
22、 tables are based upon the SI volt5andthe International Temperature Scale of 1990 (ITS-90).3.2 The temperature-emf data in Tables 8 to 23 and 26 to 45,together with the corresponding equations in Tables 7 and 46for all thermocouple types except Type C, have been extractedfrom NIST Monograph 175. Tem
23、perature-emf data inTables 24 and 25 and the coefficients for Type C in Tables 7and 46 have been developed from curves fitted to wiremanufacturers data.NOTE 1It is beyond the scope of this standard to discuss the origin ofthese tables. If further information is required, the reader should consultNIS
24、T Monograph 175.3.3 These tables give emf values to three decimalplaces (1 V) at temperature intervals of one degree. The tablesare satisfactory for most industrial uses but may not beadequate for computer and similar applications. If greaterprecision is required, the reader should refer to NIST Mon
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