ASTM_D_8092_-_17.pdf

Designation:D809217Standard Test Method forField Determination of Kinematic Viscosity Using aMicrochannel Viscometer1This standard is issued under the fixed designation D8092;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 measuring thekinematic viscosity of transparent and opaque liquids such asnew and in-service lubricating oils using a miniature micro-channel viscometer at 40 C in the range of 12.9 mm2/s to174 mm2/s1.2 The precision has only been determined for thosematerials and viscosity ranges,as indicated in Section 17 onPrecision and Bias.1.3 This test method is specifically tailored to obtaining arapid,direct,temperature-stabilized measure of the kinematicviscosity of new and in-service lubricants in the field in real-time without the use of solvents or chemical cleaning agents.The measurement takes place at 40 C and kinematic viscosityis directly obtained.No temperature extrapolations or densitycorrections are necessary.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.Some specifichazards statements are given in Section 9 on Hazards.1.6 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 Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D2162 Practice for Basic Calibration of Master Viscometersand Viscosity Oil StandardsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material2.2 ISO Standard:3ISO/IEC 17025 General Requirements for the Competenceof Testing and Calibration Laboratories3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Hele-Shaw cell,na liquid cell wherein Stokes flowis present between two parallel plates.3.1.1.1 DiscussionThe unbounded microchannel capillaryacts as a Hele-Shaw cell in this test method,which enables asimple relationship between kinematic viscosity and fluidvelocity to be established.3.1.2 loading funnel,nthe cavity in Fig.1 that the liquidis placed into upon sample introduction;the sample thentravels out of this funnel and enters the capillary.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.07.0A on Newtonian Viscosity.Current edition approved May 1,2017.Published May 2017.DOI:10.1520/D8092-17.2For 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 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 International,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,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.3 miniature capillary viscometer,na viscometer,asshown in Fig.1,which utilizes an unbounded microchannelcapillary in order to enable the direct measurement of kine-matic viscosity.3.1.4 unbounded microchannel capillary,na rectangularchannel,approximately 100 m by 2 mm,which comprises thecapillary for this test method.3.1.4.1 DiscussionThe channel,whose top view can beseen in Fig.1,is unbounded because it is open to air on twosides.The sample stays in the capillary and does not leakthrough the unbounded portion due to the inherent surfacetension at the boundary between the capillary and air.Thecapillary is repeatedly assembled for the purpose of theviscosity measurement and then disassembled immediatelyafter the viscosi