1、Designation:D768611Standard Test Method forField-Based Condition Monitoring of Soot in In-ServiceLubricants Using a Fixed-Filter Infrared(IR)Instrument1This standard is issued under the fixed designation D7686;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.1.Scope1.1 This test method pertains to field-based monitoring ofsoot in diesel crankcase engine
3、oils as well as in other types ofengine oils where soot may contaminate the lubricant as aresult of a blow-by due to incomplete combustion of fuels.It isapplicable to oils having soot levels of up to 12%.1.2 This test method uses filter-based infrared technologyfor monitoring of soot build-up in in-
4、service petroleum andhydrocarbon-based lubricants as a result of normal machineryoperation.Soot levels in engine oils rise as soot particlescontaminate the oil as a result of exhaust gas recirculation fromblow-by.This test method is designed as a fast,simple and fieldcapablespectroscopiccheckforsoot
5、inin-servicehydrocarbon-based lubricants with the objective of helpingdiagnose the operational condition of the machine based onmeasuring the level of soot in the oil.1.3 This test method is intended as a field test only,andshould be treated as such.Critical applications should uselaboratory based m
6、ethods,such as Thermal GravimetricAnaly-sis(TGA)described in Test Method D5967,Annex A4.1.4 Acquisition of spectral data for measuring soot inin-service oil and lubricant samples with the use of a fixed-filter IR instrument is described in this test method.Calibrationagainst prepared soot standards
7、is also described.NOTE1It is not the intent of this test method to establish orrecommend normal,cautionary,warning or alert limits for any machinery.Such limits should be established in conjunction with advice and guidancefrom the machinery manufacturer and maintenance group.1.5 The values stated in
8、 SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 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 p
9、ractices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D5967 Test Method for Evaluation of Diesel Engine Oils inT-8 Diesel EngineD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate An
10、alyticalMeasurement System PerformanceD7418 Practice for Set-Up and Operation of Fourier Trans-form Infrared(FT-IR)Spectrometers for In-Service OilCondition MonitoringE131 Terminology Relating to Molecular SpectroscopyE2412 Practice for Condition Monitoring of In-Service Lu-bricants by Trend Analysi
11、s Using Fourier TransformInfrared(FT-IR)Spectrometry3.Terminology3.1 DefinitionsFor definitions of terms relating to infraredspectroscopy used in this test method,refer to TerminologyE131.3.2 DefinitionsFor definition of terms related to in-serviceoil condition monitoring,refer to Practice D7418.4.S
12、ummary of Test Method4.1 This test method uses filter-based infrared spectrometryto monitor levels of soot in in-service petroleum and hydro-carbon based lubricants.The test method is meant to serve asa field-based method to provide an indicator of soot level.Awell homogenized sample of oil is appli
13、ed to a HorizontalAttenuated Total Reflectance(HATR)crystal.Infrared light istotally internally reflected through the HATR crystal and thenpassed through a broadband infrared filter centered on 3.9 m.The amount of infrared light reaching a detector is converted toa soot concentration via a calibrati
14、on curve generated from theinstrument response on various soot standards.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.96 on In-Service Lubricant Testing and Condition Monitoring Services.Curr
15、ent edition approved June 15,2011.Published August 2011.DOI:10.1520/D768611.2For 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 AST
16、M website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 This test method provides a simple field-based tech-nique for condition monitoring of soot in in-service lubricantsassociated with combustion engines,machinery,and equip-ment used in industry and by the military.Critical applicationsshould use laboratory based test methods,such as ThermalGravimetric Analysis(TGA)described in Test Method D5967,Annex A4.
