ASTM_E_1751_-_E_1751M_-_15.pdf

Designation:E1751/E1751M15Standard Guide forTemperature Electromotive Force(emf)Tables for Non-Letter Designated Thermocouple Combinations1This standard is issued under the fixed designation E1751/E1751M;the number immediately following the designation indicates the yearof 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 guide consists of reference tables that givetemperature-electromotive force(emf)relationships for specialpurpose,limited use,thermocouple combinations that do nothave a letter designation.1.2 Extension wire or compensating extension wires are notcovered by this guide.ASTM MNL 122or thermocouple alloysuppliers should be consulted.1.3 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,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:3E344 Terminology Relating to Thermometry and Hydrom-etryE696 Specification for Tungsten-Rhenium Alloy Thermo-couple Wire3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this guide see Termi-nology E344.3.2 Definitions of Terms Specific to This Standard:3.2.1 matched pairs,na set of positive and negativethermoelements chosen so that a thermocouple fabricated fromthese thermoelements will match a specified temperature-electromotive force relationship to within a specified tolerance,at the time of first use.4.Source of Data4.1 The data in these tables are based on the SI Volt and theInternational Temperature Scale of 1990.4.2 All temperatureelectromotive force data in Tables 1-20have been developed from NIST,NRC,and wire manufactur-ers data.4.3 Tables 1-16 give emf values in millivolts to threedecimal places(1 V)at 1C or 1F intervals.Tables 17-20give emf values in microvolts to one decimal place(0.1 V)at1C or 1F intervals.If greater precision is required,refer tothe equation and coefficients listed for each thermocouplealloy.5.Significance and Use5.1 These thermocouple combinations have been developedfor specific applications by the wire manufacturer(s).If addi-tional information is required,consult ASTM MNL 12 or thewire manufacturer.6.Thermocouple Types6.1 Letter symbols have not been assigned.Identification ismade by alloy composition with the thermoelectrically positivematerial listed first.6.1.1 Tungsten versus tungsten-26%rhenium.6.1.2 Tungsten-3%rhenium versus tungsten-25%rhe-nium.6.1.3 Platinel II.46.1.4 KP versus gold-0.07%iron.56.1.5 Platinum-5%molybdenum versus platinum-0.1%molybdenum.6.1.6 Platinum-40%rhodium versus platinum-20%rho-dium.1This guide is under the jurisdiction of ASTM Committee E20 on TemperatureMeasurement and is the direct responsibility of Subcommittee E20.04 on Thermo-couples.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 1995.Last previous edition approved in 2009 as E1751_E1751M 091.DOI:10.1520/E1751_E1751M-15.2“Manual on the Use of Thermocouples in Temperature Measurement,”ASTMManual,12,ASTM,1993.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Trademark of Engelhard Corp.,Specialty Metals Division.5Alloy compositions are expressed in percentages by mass,except for thegold-0.07%iron alloy,which is given in atomic percent.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.1.7 Nickel-18%molybdenum versus nickel-0.8%co-balt.66.1.8 Iridium-40%rhodium versus iridium.6.1.9 Gold versus platinum.6.1.10 Platinum versus palladium.7.Tolerances on Initial Values of emf versusTemperature7.1 Tolerances on initial values of emf versus temperaturehave not been established for the thermocouples in this guideexcept for the Tungsten-3%Rhenium versus Tungsten-25%Rhenium,and that data can be found in Specification E696.When required,tolerances on initial values of emf versustemperature should be established by agreement between theconsumer and the producer.These thermocouple combinationsare supplied typically as matched pairs.8.Table Information8.1 The following is a list of emf versus temperature tablesincluded in this guide.Table NumberThermocouple TypeTemperature RangeTable 1Tungsten versus Tungsten-26%Rhenium0 to 2315CTable 2Tungsten versus Tungsten-26%Rhenium32 to 4200FTable 3Tungsten-3%Rhenium versusTungsten-25%Rhenium0 to 2315CTable 4Tungsten-3%Rhenium versusTungsten-25%Rhenium32 to 4200FTable 5Platinel II0 to 1395CTable 6Platinel II32 to 2543FTable 7KP versus Gold-0.07%Iron273 to 7CTable 8KP versus Gold-0.07%Iron459 to 44FTabl