ASTM_E_2744_-_10_2015.pdf

Designation:E274410(Reapproved 2015)Standard Test Method forPressure Calibration of Thermal Analyzers1This standard is issued under the fixed designation E2744;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method describes the calibration or perfor-mance confirmation of the electronic pressure signals fromthermal analysis apparatus.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 There is no ISO standard equivalent to this test method.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:2D5483 Test Method for Oxidation Induction Time of Lubri-cating Greases by Pressure Differential Scanning Calorim-etryD6186 Test Method for Oxidation Induction Time of Lubri-cating Oils by Pressure Differential Scanning Calorimetry(PDSC)D5720 Practice for Static Calibration of ElectronicTransducer-Based Pressure Measurement Systems forGeotechnical PurposesD5885 Test Method for Oxidative Induction Time of Poly-olefin Geosynthetics by High-Pressure Differential Scan-ning CalorimetryE473 Terminology Relating to Thermal Analysis and Rhe-ologyE537 Test Method for The Thermal Stability of Chemicalsby Differential Scanning CalorimetryE1142 Terminology Relating to Thermophysical PropertiesE1782 Test Method for Determining Vapor Pressure byThermal AnalysisE1858 Test Method for Determining Oxidation InductionTime of Hydrocarbons by Differential Scanning Calorim-etryE2009 Test Methods for Oxidation Onset Temperature ofHydrocarbons by Differential Scanning CalorimetryE2161 Terminology Relating to Performance Validation inThermal Analysis3.Terminology3.1 Definitions:3.1.1 The technical terms used in this test method aredefined in Terminologies E473,E1142,and E2161,includingcalibration,Celsius,differential scanning calorimetry,highpressure,linearity,oxidative induction time,thermal analysis,and vapor pressure.3.2 Definitions of Terms Specific to This Standard:3.2.1 absolute pressure,npressure measured relative tozero pressure corresponding to empty space.3.2.1.1 DiscussionAbsolute pressure is atmospheric pres-sure plus gage pressure.3.2.2 atmospheric pressure,nthe pressure due to theweight of the atmosphere.3.2.2.1 DiscussionAtmospheric pressure varies with el-evation above sea level,acceleration due to gravity andweather conditions.Standard atmospheric pressure is101.325 kPa.3.2.3 barometer,nan instrument for measuring atmo-spheric pressure.3.2.4 gage pressure,npressure measured relative to atmo-spheric pressure.3.2.4.1 DiscussionZero gage pressure is equal to atmo-spheric pressure.Gage pressure is the difference betweenabsolute pressure and atmospheric pressure.3.2.5 pressure,nthe force exerted to a surface per unitarea.3.2.6 vacuum,npressure less than atmospheric pressure.4.Summary of Test Method4.1 The pressure(vacuum)signal generated by a thermalanalyzer is compared to a gage whose performance is known1This test method is under the jurisdiction ofASTM Committee E37 on ThermalMeasurements and is the direct responsibility of Subcommittee E37.10 onFundamental,Statistical and Mechanical Properties.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 2010.Last previous edition approved in 2010 as E2744 10.DOI:101520/E2744-10R15.2For 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 and traceable to a national metrology institute.The thermalanalyzer may be said to be in conformance if the performanceis within established limits.Alternately,the pressure signalmay be calibrated using a two-point calibration method.5.Significance and Use5.1 Most thermal analysis experiments are conducted underambient pressure conditions using isothermal or temperaturetime rate of change conditions where time or temperature is theindependent parameter.Some experiments,however,are con-ducted under reduced or elevated pressure conditions wherepressure is an independent experimental parameter(TestMethod E537).Oxidation Induction Times(Test MethodsD5483,D5885,D6186,and E1858),Oxidation Onset Tem-perature(Test Method E2009),and the Vapor Pressure(TestMethod E1782)are other examples of experiments conductedunder elevated or reduced pressure(vacuum)con