ASTM_D_8004_-_15.pdf

Designation:D800415Standard Test Method forFuel Dilution of In-Service Lubricants Using SurfaceAcoustic Wave Sensing1This standard is issued under the fixed designation D8004;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 a means for determining theamount of fuel dilution present in an in-service lubricant.Thisis achieved by drawing into a surface acoustic wave(SAW)sensor vapor from the lubricant.Fuel vapor will be absorbed bythe SAW sensors polymer coating.The amount of absorbanceis then related to fuel content in the lubricant.1.2 The range of fuel dilution capable of being measured bythe test method is from 0.1%to 10.0%by mass fuel dilution.1.3 This test method is specifically tailored to determiningthe fuel dilution of in-service lubricants,including newlyutilized lubricants.The method is applicable to contaminationwith diesel,gasoline,and jet fuels.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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.See Section 9.2.Referenced Documents2.1 ASTM Standards:2E456 Terminology Relating to Quality and StatisticsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a MaterialD7235 Guide for Establishing a Linear Correlation Relation-ship Between Analyzer and Primary Test Method ResultsUsing Relevant ASTM Standard PracticesD7593 Test Method for Determination of Fuel Dilution forIn-Service Engine Oils by Gas ChromatographyD7669 Guide for Practical Lubricant Condition Data TrendAnalysisD7720 Guide for Statistically Evaluating Measurand AlarmLimits when Using Oil Analysis to Monitor Equipmentand Oil for Fitness and Contamination3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fuel dilution sample holder,na bottle that containsthe lubricant to be analyzed.For example,this may be astandard 125 mL bottle(see Fig.1,example configuration A)or a standard 30 mL laboratory vial(see Fig.2,exampleconfiguration B).3.1.2 fuel dilution sample inlet,na tube that connects thesample to the SAW sensor.3.1.3 fuel dilution sample stand,nmechanical device forholding the bottle of lubricant in the SAW fuel dilutionapparatus in a way such that the headspace from the bottle isdirectly fed into the SAW element.3.1.4 fuel dilution seal,na mechanism that seals the fueldilution sample holder to the vapor path leading to the SAWsensor.3.1.5 SAW fuel dilution apparatus,na device that mea-sures fuel dilution using surface acoustic wave(SAW)tech-nology.This is achieved by drawing vapor from the lubricantinto a surface acoustic wave(SAW)sensor.The fuel dilutionapparatus measures the concentration of contaminating fuelvapor present in the air“headspace”over the lubricant.Thefuel dilution apparatus assumes that this headspace fuel vaporconcentration is directly proportional to the fuel present in theoil.This relationship is based on Henrys Law.As fuelcontamination builds up,a vapor concentration will be estab-lished in the headspace that is directly proportional to theconcentration dissolved in the oil.The fuel dilution apparatususes a SAW sensor to make these measurements.3.1.6 SAW sensor,nconsists of a piezoelectric substratethat has an interdigitated electrode lithographically patternedon its surface.The surface of the SAW sensor has a polymer1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.96.02 on Chemistry for the Evaluation of In-Service Lubricants.Current edition approved Oct.1,2015.Published October 2015.DOI:10.1520/D8004-152For 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 coating that is chosen to offer specific solubility to fuel vapors.The mechanism of detection is a reversible absorption of thefuel component into the polymer.When this device is excitedby external RF(radio frequency)voltage,a synchronousRayleigh wave is generated on the surface of the device.Whenfuel contamination comes in contact with the SAW sensorsurface,it