Brookfield DV2T Extra Viscometer Manuel d'utilisateur télécharger pdf (Page 25)

Brookeld Engineering Labs., Inc. Page 25 Manual No. M13-167-B0614

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-2.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.

III.4 Multiple Data Points

Themajorityofviscosityandyieldstressmeasurementsaremadeatthequalitycontrol

levelandoftenconsistofasingledatapoint.Thetestisconductedwithonespindleatone

speed.Thedatapointisausefulbenchmarkforthego/no-godecisioninaproduction

setting.TheDV2Tcanbeusedforsinglepointmeasurement.

Manyuidsexhibitacharacteristicchangeinviscosityandyieldstresswithachangein

appliedforce.Thisnon-Newtonianowbehavioriscommonlyseeninpaints,coatingsand

foodproductsasadecreaseinviscosityasshearrateincreasesoranincreaseinyield

stressasarotationalspeedincreases.Thisbehaviorcannotbedetectedorevaluated

withthesinglepointmeasurement.

Non-Newtonianowisanalyzedthroughthecollectionofviscositydataoverarangeof

shearratesandthegenerationofagraphofviscosityversusshearrate(arheogram).

Thisinformationwillallowforamorecompletecharacterizationofauidandmayhelpin

formulationandproductionofaproduct.TheDV2Tiscapableofcollectingmultipledata

pointsforcomprehensiveanalysisofowbehaviorwhenusingtestprogramscreatedwith

PGFlashSoftware(seeSectionV).

Moreinformationonowbehavior,shearrateandrheogramsisavailableinourpublication,

“MoreSolutionstoStickyProblems”.

III.5 Selecting Data Collection

TheDV2TViscometeroffersseveraloptionsfordatacollection.TheDataCollectionsetting

isshowninCongureViscosityTestdirectlyundertheTemperaturedisplay.Thefactory

settingisSinglePoint(seeFigureIII-3).Pressingthebluearrow,inthiseld,willpresent

theDataCollectionscreen(seeFigureIII-4).

Figure III-2

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Brookfield DV2T Extra Viscometer Manuel d'utilisateur Page 25