ASTM_E_1137_-_E_1137M_-_08_2014.pdf

Designation:E1137/E1137M08(Reapproved 2014)Standard Specification forIndustrial Platinum Resistance Thermometers1This standard is issued under the fixed designation E1137/E1137M;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 specification covers the requirements for metal-sheathed industrial platinum resistance thermometers(PRTs)suitable for direct immersion temperature measurement.Itapplies to PRTs with an average temperature coefficient ofresistance between 0 and 100C of 0.385%C and nominalresistance at 0C of 100 or other specified value.Thisspecification covers PRTs suitable for all or part of thetemperature range 200 to 650C.The resistance-temperaturerelationship and tolerances are specified as well as physical,performance,and testing requirements.1.2 The values of temperature in this specification are basedon the International Temperature Scale of 1990(ITS-90).21.3 The values stated in inch-pound units or SI(metric)units may be regarded separately as standard.The values statedin each system are not exact equivalents,and each system shallbe independent of the other.1.4 This standard does 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 Standards:3A269 Specification for Seamless and Welded AusteniticStainless Steel Tubing for General ServiceB167 Specification for Nickel-Chromium-Iron Alloys(UNSN06600,N06601,N06603,N06690,N06693,N06025,N06045,andN06696),Nickel-Chromium-Cobalt-Molybdenum Alloy(UNS N06617),and Nickel-Iron-Chromium-Tungsten Alloy(UNS N06674)Seamless Pipeand TubeE344 Terminology Relating to Thermometry and Hydrom-etryE644 Test Methods for Testing Industrial Resistance Ther-mometersE1652 Specification for Magnesium Oxide and AluminumOxide Powder and Crushable Insulators Used in theManufacture of Base Metal Thermocouples,Metal-Sheathed Platinum Resistance Thermometers,and NobleMetal Thermocouples3.Terminology3.1 DefinitionsFor definitions of terms used in this speci-fication see Terminology E344.3.2 Definitions of Terms Specific to This Standard:3.2.1 connecting wire end closure,nmoisture barrier atthe connecting wire end of the sheath.3.2.1.1 DiscussionThe closure is intended to provide aseal sufficient to prevent the sensors insulation resistance fromdropping below the minimum requirements.3.2.2 connecting wires,nwires that run from the elementthrough the connecting wire end closure and external to thesheath.3.2.3 excitation,nelectrical current passing through theelement.3.2.4 g-level,nacceleration of an object relative to thelocal acceleration of gravity.3.2.4.1 DiscussionFor example,a g-level of 5 is equiva-lent to an acceleration of approximately 5 9.8 m/s2=49.0m/s2.3.2.5 minimum immersion length,ndepth that a thermom-etershouldbeimmersed,inauniformtemperatureenvironment,such that further immersion does not produce achange in indicated temperature greater than the specifiedtolerance.3.2.6 PRT design,ngeneric term used to differentiatebetween different PRT construction details,such as elementand connecting wire construction,insulation methods,sealingtechniques,and mounting methods(for example,spring loadedor direct mounting).1This specification is under the jurisdiction of ASTM Committee E20 onTemperature Measurement and is the direct responsibility of Subcommittee E20.03on Resistance Thermometers.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1987.Last previous edition approved in 2008 as E1137 08.DOI:10.1520/E1137_E1137M-08R14.2Preston-Thomas,H.,“The International Temperature Scale of 1990(ITS-90),”Metrologia,Vol 27,No.1.1990,pp 3 10,ibid,Vol 27,No.2,1990,p1073For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.7 self-heating,nchange in temperature of the elementcaused by the heating effect of the excitation.3.2.8 sheath,ncylindrical metal tube with an integralwelded closure at the end in which the element is located.4.Significance and Use4.1 This specification is written to provide commonterminology,resistance versus temperature characteristics,ac-curacy classification,and inspection requirements for a speci-fied configuration of a typical industrial platinum resistancethermometer(PRT).4.2 This specification may be used as part of the documen-tation to support negotiati