ASTM E230 E230M-2011 0000 Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶用温度电动势(EMF)图表的标准规范》.pdf
《ASTM E230 E230M-2011 0000 Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶用温度电动势(EMF)图表的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM E230 E230M-2011 0000 Standard Specification and Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶用温度电动势(EMF)图表的标准规范》.pdf(189页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E230/E230M 11An 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 a
2、doption 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. Scope1.1 This specification contains reference tables (Tables 8 to25) that giv
3、e 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 for the thermocouple types covered by thisstandard and m
4、ay 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), thermocouple extension wires(Table 2), and compensatin
5、g 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 covered in Tables 8 to 25.1.3 Tables 4 and 5 provide insula
6、tion 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 to 45 give temperature-emf data for single-legthermoel
7、ements 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 to 21 represent thethermoelectric properties of Type R
8、P 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 be used for compu-tation of thermocouple emf as a funct
9、ion 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 they are nominally thesame as for types R and S thermoc
10、ouples, 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 polynomials are given inTable 46. These may be used for comput
11、ing 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 thermoelec-tric properties of materials that conform to the rela
12、tionshipspresented 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 specification.Theuser is referred to specific standards such as Spe
13、cificationsE235, 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 given inAppendix X1.1.12 The values stated in either SI uni
14、ts 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 direct responsibility of Subcommittee E20.04 onThermoco
15、uples.Current edition approved May 15, 2011. Published August 2011. Originallyapproved in 1963. Last previous edition approved in 2003 as E230 03. DOI:10.1520/E0230_E0230M-11.2These temperature-emf relationships have been revised as required by theinternational adoption in 1989 of a revised Internat
16、ional Temperature Scale(ITS-90).1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.system shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.13 This standard d
17、oes not purport to address all of thesafety concerns, 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 St
18、andards:3E235 Specification for Thermocouples, Sheathed, 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-Sheath
19、ed, Base Metal ThermocoupleCableE608/E608M Specification 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 Thermoco
20、uplesand Thermocouple Cable2.2 NIST Monograph:NIST Monograph 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 Identificat
21、ion System,19893. Source of Data3.1 The data in these 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 Ty
22、pe C, have been extractedfrom NIST Monograph 175. Temperature-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
23、information is required, the reader should consultNIST 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 greaterpreci
24、sion is required, the reader should refer to NIST Mono-graph 175 which includes tables giving emf values to fourdecimal places (0.1 V) for each type except Type C. Equa-tions which permit easy and unique generation of thetemperature-emf relationships can be found in Table 7. Forconvenience, coeffici
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