ASTM E230 E230M-2017 red 2500 Standard Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶用温度电动势(emf)图表的标准规格》.pdf
《ASTM E230 E230M-2017 red 2500 Standard Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶用温度电动势(emf)图表的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM E230 E230M-2017 red 2500 Standard Specification for Temperature-Electromotive Force (emf) Tables for Standardized Thermocouples《标准化热电偶用温度电动势(emf)图表的标准规格》.pdf(172页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E230/E230M 12E230/E230M 17 An American National StandardStandard Specification forTemperature-Electromotive Force (emf) Tables forStandardized Thermocouples1This standard is issued under the fixed designation E230/E230M; the number immediately following the designation indicates the yea
2、rof 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. Scope1.1 This specification contains reference tables (Tables 8
3、to 25) that give temperature-electromotive force (emf) relationshipsfor Types B, E, J, K, N, R, S, T, and C thermocouples.2 These are the thermocouple types most commonly used in industry. Thetables contain all of the temperature-emf data currently available for the thermocouple types covered by thi
4、s standard and mayinclude 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 forthermocouples (Table 1), thermocouple extension wires (Table 2
5、), 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 inTables 1, 2, and 3, and do not apply to the temperature ranges covered in Tables 8 to 25.1.3 Tables 4 and
6、5 provide insulation color coding for thermocouple and thermocouple extension wires as customarily used inthe 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 s
7、ingle-leg thermoelements referenced to platinum (NIST Pt-67). The tablesinclude 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 thethermoelectric
8、properties ofType RPand SPthermoelements referenced to pure platinum.Tables for the individual thermoelementsof 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
9、 emf as a function of temperature are given inTable 7. Coefficients for the emf of each thermocouple pair as well as for the emf of most individual thermoelements versusplatinum are included. Coefficients for type RP and SP thermoelements are not included since they are nominally the same as fortype
10、s 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 ma
11、y be used for computing a close approximationof temperature (C) as a function of thermocouple emf. Inverse functions are provided only for thermocouple pairs and are validonly over the emf ranges specified.1.9 This specification is intended to define the thermoelectric properties of materials that c
12、onform to the relationships presentedin the tables of this standard and bear the letter designations contained herein. Topics such as ordering information, physical andmechanical properties, workmanship, testing, and marking are not addressed in this specification. The user is referred to specificst
13、andards 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 intended for industrial and laboratory use.1.11 Thermocouple color codes per IEC 5843 are given in Appendix X1.1.12 The values
14、 stated in either SI units or inch-pound units are to be regarded separately as standard.1.12.1 The values stated in brackets are not conversions to the values they succeed and therefore shall be used independentlyof the preceding values.1 This specification is under the jurisdiction of ASTM Committ
15、ee E20 on Temperature Measurement and are the direct responsibility of Subcommittee E20.11 onThermocouples - Calibration.Current edition approved Nov. 1, 2012Nov. 1, 2017. Published November 2012November 2017. Originally approved in 1963. Last previous edition approved in 20112012as E230 11E230/E230
16、M 12.1. DOI: 10.1520/E0230_E0230M-12.10.1520/E0230_E0230M-17.2 These temperature-emf relationships have been revised as required by the international adoption in 1989 of a revised International Temperature Scale (ITS-90).This document is not an ASTM standard and is intended only to provide the user
17、of an ASTM standard an indication of what changes have been made to the previous version. Becauseit 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 versionof the standard as p
18、ublished by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.12.2 The values given in parentheses are conversions of the values they succeed.1.12.3 Combining values from the two systems
19、may result in non-conformance with the standard.1.13 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of reg
20、ulatorylimitations prior to use.1.14 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Orga
21、nization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:3E235 Specification for Thermocouples, Sheathed, Type K and Type N, for Nuclear or for Other High-Reliability ApplicationsE574 Specification for Duplex, Base Metal Thermocouple Wire With Glass Fiber or Sil
22、ica Fiber InsulationE585/E585M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Base Metal Thermocouple CableE608/E608M Specification for Mineral-Insulated, Metal-Sheathed Base Metal ThermocouplesE1159 Specification for Thermocouple Materials, Platinum-Rhodium Alloys, and PlatinumE2181
23、/E2181M Specification for Compacted Mineral-Insulated, Metal-Sheathed, Noble Metal Thermocouples and Thermo-couple Cable2.2 NIST Monograph:NIST Monograph 175 Temperature-Electromotive Force Reference Functions and Tables for the Letter-Designated Thermo-couple Types Based on the ITS-9042.3 IEC Stand
24、ard:IEC 5843 Thermocouples Part 3: Extension and Compensating Cables Tolerances and Identification System, 19893. Source of Data3.1 The data in these tables are based upon the SI volt5 and the International Temperature Scale of 1990 (ITS-90).3.2 The temperature-emf data in Tables 8 to 23 and 26 to 4
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