1、Designation:D764710(Reapproved 2018)Standard Test Method forAutomatic Particle Counting of Lubricating and HydraulicFluids Using Dilution Techniques to Eliminate theContribution of Water and Interfering Soft Particles by LightExtinction1This standard is issued under the fixed designation D7647;the n
2、umber 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 T
3、his test method covers the determination of particleconcentration and particle size distribution in new and in-service oils used for lubrication and hydraulic purposes.1.2 Particles considered are in the range from 4 m(c)to200 m(c)with the upper limit being dependent on the specificautomatic particl
4、e counter being used.NOTE1For the purpose of this test method,water droplets not maskedby the diluent procedure are detected as particles,and agglomeratedparticles are detected and reported as a single larger particle.NOTE2The subscript(c)is used to denote that the apparatus has beencalibrated in ac
5、cordance with ISO 11171.This subscript(c)strictly onlyapplies to particles up to 50 m.1.3 Lubricants that can be analyzed by this test method arecategorized as petroleum products or synthetic based products,such as:polyalpha olefin,polyalkylene glycol,or phosphateester.Applicable viscosity range is
6、up to 1000 mm2/s at 40 C.This procedure may be appropriate for other petroleum andsynthetic based lubricants not included in the precision state-ment.1.4 Samples containing visible particles may not be suitablefor analysis using this test method.1.5 Samples that are opaque after dilution are not sui
7、tablefor analysis using this test method.1.6 The test method is specific to automatic particle coun-ters that use the light extinction principle and are calibratedaccording to the latest revision of ISO 11171.1.7 The values stated in SI units are to be regarded asstandard.No other units of measureme
8、nt are included in thisstandard.1.8 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,health,and environmental practices and deter-mine the applicability of regulato
9、ry limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organi
10、zation TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD6786 Test Method for Particle Count in Mineral InsulatingOil Using A
11、utomatic Optical Particle Counters2.2 ISO Standards:3ISO3722 HydraulicfluidpowerFluidsamplecontainersQualifying and controlling cleaning methodsISO 4406 Hydraulic fluid powerFluidsMethod for cod-ing level of contamination by solid particlesISO 11171 Hydraulic fluid powerCalibration of automaticparti
12、cle counters for liquids3.Terminology3.1 Definitions:3.1.1 For the purposes of this test method,the followingdefinitions apply:1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.96.05
13、on In-Service Lubricants Particle Counting Practices andTechniques.Current edition approved April 1,2018.Published May 2018.Originallyapproved in 2010.Last previous edition approved in 2010 as D7647 10.DOI:10.1520/D7647-10R18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orconta
14、ct ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM Inte
15、rnational,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guide
16、s and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.2 coincidence,nthe presence of more than one particlein the sensing zone of a particle analyzer at the same time,causing incorrect sizing and incorrect counting of the particlepresent.The coincidence limit of the counter is determined bythe maximum acceptable concentration of particles in thesensing zone and is supplied by the instrument manufacturer.Refer to Section 3.4 in ISO 11171.3.1.
