1、Designation:D741812Standard Practice forSet-Up and Operation of Fourier Transform Infrared(FT-IR)Spectrometers for In-Service Oil Condition Monitoring1This standard is issued under the fixed designation D7418;the number immediately following the designation indicates the year oforiginal adoption or,
2、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.INTRODUCTIONThis practice describes the instrument set-up and operation parameters for using FT-IR
3、 spectrom-eters for in-service oil condition monitoring.The following parameters are typically monitored forpetroleum and hydrocarbon based lubricants:water,soot,oxidation,nitration,phosphate antiwearadditives,fuel dilution(gasoline or diesel),sulfate by-products and ethylene glycol.Measurement andd
4、ata interpretation parameters are standardized to allow operators of different FT-IR spectrometers toobtain comparable results by employing the same techniques.Two approaches may be used to monitorin-service oil samples by FT-IR spectrometry:(1)direct trend analysis and(2)differential(spectralsubtra
5、ction)trend analysis.The former involves measurements made directly on in-service oilsamples,whereas the latter involves measurements obtained after the spectrum of a reference oil hasbeen subtracted from the spectrum of the in-service oil being analyzed.Both of these approaches aredescribed in this
6、 practice,and it is up to the user to determine which approach is more appropriate.1.Scope1.1 This practice covers the instrument set-up and operationparameters for using FT-IR spectrometers for in-service oilcondition monitoring for both direct trend analysis and differ-ential trend analysis approa
7、ches.1.2 This practice describes how to acquire the FT-IR spec-trum of an in-service oil sample using a standard transmissioncell and establishes maximum allowable spectral noise levels.1.3 Measurement and integrated parameters for individualin-service oil condition monitoring components and param-e
8、ters are not described in this practice and are described in theirrespective test methods.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thesafety concerns,if any,associa
9、ted 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:2D4057 Practice for Manual Sampling of Petroleum andPetroleum P
10、roductsE131 Terminology Relating to Molecular SpectroscopyE168 Practices for General Techniques of Infrared Quanti-tative Analysis(Withdrawn 2015)3E1421 Practice for Describing and Measuring Performanceof Fourier Transform Mid-Infrared(FT-MIR)Spectrom-eters:Level Zero and Level One TestsE1866 Guide
11、for Establishing Spectrophotometer Perfor-mance TestsE2412 Practice for Condition Monitoring of In-Service Lu-bricants by Trend Analysis Using Fourier TransformInfrared(FT-IR)Spectrometry3.Terminology3.1 Definitions:3.1.1 For definitions of terms relating to infrared spectros-copy used in this pract
12、ice,refer to Terminology E131.3.1.2 Fourier transform infrared(FT-IR)spectrometry,nform of infrared spectrometry in which an interferogram is1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mitt
13、ee D02.96 on In-Service Lubricant Testing and Condition Monitoring Services.Current edition approved Dec.1,2012.Published December 2012.Originallyapproved in 2007.last previous edition approved in 2007 as D7418 07.DOI:10.1520/D7418-12.2For referenced ASTM standards,visit the ASTM website,www.astm.or
14、g,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Dr
15、ive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 obtained;this interferogram is then subjected to a Fouriertransform calculation to obtain an amplitude-wavenumber(orwavelength)spectrum.3.2 Definitions of Terms Specific to This Standard:3.2.1 condition monitoring,n field of technical ac
16、tivity inwhich selected physical parameters associated with an operat-ing machine are periodically or continuously sensed,measuredand recorded for the interim purpose of reducing,analyzing,comparing and displaying the data and information so obtainedand for the ultimate purpose of using interim result to supportdecisions related to the operation and maintenance of themachine.(1,2)43.2.2 direct trend analysis,nmonitoring of the level andrate of change over operating time of measured parameters(2,
