Brookfield DV3T Rheometer Manual de usuario descargar pdf (Pagina 29)

Brookeld Engineering Labs., Inc. Page 29 Manual No. M13-2100

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.Thereare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.

DV3TLVRheometersareprovidedwithasetoffourspindlesand

a narrow guardleg; DV3TRV Rheometers come with a set of six

spindlesandawiderguardleg;DV3THAandDV3THBRheometers

comewithasetofsixspindlesandno guardleg.(SeeAppendixF

formoreinformationontheguardleg.)

Thespindlesareattachedtotherheometerbyscrewingthemonto

thecouplingnutonthelowershaft(seeFigureIII-4).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.

IfyourinstrumenthastheEZ-Locksystem,thespindlesareattached

as follows:

With one hand holdthespindle,whilegentlyraisingthespring-

loadedoutersleevetoitshighestpositionwiththeotherhand,as

shown in Figure III-5.  Insert the EZ-Lock SpindleCoupling so

thatthebottomofthecouplingisushwiththebottomoftheshaft,

andlowerthesleeve.Thesleeveshouldeasilyslidebackdownto

holdthespindle/couplingassemblyinplaceforuse.[Spindlescan

beidentiedbyentrycode;lookforthenumberonthesideofthe

EZ-Lockspindlecoupling.]

ThemotorshouldbeOFF whenever

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

Note: KeeptheEZ-LockSpindleCouplingand

outer sleeve as clean as possible and free

from debris that could become lodged

insidetheadapter.

Figure III-5

Figure III-4

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 124 125

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Brookfield DV3T Rheometer Manual de usuario Pagina 29

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