1、Designation:D764710Standard 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 number immediately
2、 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 c
3、overs 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)to 200m(c)with the upper limit being dependent on the specificautomatic particle counter being u
4、sed.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 accordance with ISO
5、 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 up to 1000 mm2/s
6、40C.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 suitablefor analysis usi
7、ng 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 measurement are included in th
8、isstandard.1.8 This test method 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.Re
9、ferenced 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 Automatic Optical Particle Counters2.2 ISO Standards:
10、3ISO 3722 Hydraulic Fluid PowerFluid Sample ContainersQualifying and Controlling Cleaning MethodsISO 4406 Hydraulic Fluid PowerFluidsMethod for Cod-ing Level of Contamination by Solid ParticlesISO 11171 Hydraulic Fluid PowerCalibration of AutomaticParticle Counters for Liquids3.Terminology3.1 Defini
11、tions:3.1.1 For the purposes of this test method,the followingdefinitions apply: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 cou
12、nter 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 11171.3.1.3 diluent,na solvent listed in Annex A1,Table A1.1,having viscosity less than 10 mm2/s at 40C that is physically1This test me
13、thod is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.96.05 on In-Service Lubricants Particle Counting Practices and Techniques.Current edition approved July 1,2010.Published September 2010.DOI:10.1520/D764710.2Fo
14、r 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.3Available from American National Standards Institute(ANSI),25 W.43rd
15、 St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 and chemically compatible with the apparatus used and easilysoluble at room temperature with the sample lubricant orhydraulic fluid.3.1.4
16、emulsified water,nwater that exists in oil betweenthe states of fully dissolved and phase-separated.An emulsi-fying agent in the oil causes the two immiscible liquids tocoexist in a heterogeneous mixture.3.1.5 free water,nwater that exists in a separate phase inan oil sample.This occurs when the water content of the oilexceeds the water holding capacity of the oil.3.1.6 interfering soft particles,nan undissolved,dispersedmaterial(such as an additive)within an oil blend or substancethat is formed
