Brookfield DV2T Viscometer Manual do Utilizador descarregar pdf (Página 24)

Brookeld Engineering Labs., Inc. Page 24 Manual No. M13-167-B0614

  Manysamplesmustbecontrolledtoaspecictemperatureforviscositymeasurement.

When  conditioning a sample for temperature, be sure to temperature control the

containerandspindleaswellasthesample.

  Pleaseseeourpublication,“MoreSolutionstoStickyProblems”,formoredetailrelating

to sample preparation.

III.3 Selecting a Spindle/Speed

TheDV2Thasthecapabilityofmeasuringviscosityoveranextremelywiderange.For

example,theDV2TRVcanmeasureuidswithintherangeof100-40,000,000cP.This

rangeisachievedthroughtheuseofseveralspindlesovermanyspeeds.SeeAppendix

B for details.

Theprocessofselectingaspindleandspeedforanunknownuidisnormallytrialand

error. An appropriate selection will result in measurements made between 10-100 on

the instrument % torque scale.Twogeneralruleswillhelpinthetrialanderrorprocess.

1)Viscosityrangeisinverselyproportionaltothesizeofthespindle.

 2)Viscosityrangeisinverselyproportionaltotherotationalspeed.

Inotherwords:tomeasurehighviscosity,chooseasmallspindleand/oraslowspeed.

Ifthechosenspindle/speedresultsinareadingabove100%,thenreducethespeedor

chooseasmallerspindle.

Experimentationmayrevealthatseveralspindle/speedcombinationswillproducesatisfactory

resultsbetween10-100%.Whenthiscircumstanceoccurs,anyofthespindlesmaybe

selected.

Non-Newtonianuidbehaviorcanresultinthemeasuredviscosityandyieldstresschanging

ifthespindleand/orspeedischanged.Seeourpublication,“MoreSolutionstoSticky

Problems”,formoredetails.

When viscosity data must be compared, be sure to use

the same test methodology: namely the same instrument,

spindle, speed, container, temperature and test time.

DV2TLVViscometersareprovidedwithasetoffourspindles

andanarrowguardleg;DV2TRVViscometerscomewithaset

ofsixspindlesandawiderguardleg;DV2THAandDV2THB

Viscometerscomewithasetofsixspindlesandno guardleg.

(SeeAppendixGformoreinformationontheguardleg.)

The spindles are attached to the viscometer by screwing

themontothecouplingnutonthelowershaft(seeFigure

III-1).Notethatthespindleshavealeft-handthread.The

lowershaftshouldbesecuredandslightlyliftedwithonehand

whilescrewingthespindletotheleft.Thefaceofthespindle

nutandthematchingsurfaceonthelowershaftshouldbe

smoothandcleantopreventeccentricrotationofthespindle.

Spindlescanbeidentiedbythenumberonthesideofthe

spindle coupling nut.

The motor should be OFF whenever

spindlesarebeingremovedorattached.

Figure III-1

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Sachin Vaijanath Ashture 05 Mar 2025 | 15:48:33

It's good information

Brookfield DV2T Viscometer Manual do Utilizador Página 24

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