Brookfield DV3T Rheometer Manual do Utilizador descarregar pdf (Página 31)

Brookeld Engineering Labs., Inc. Page 31 Manual No. M13-2100

Figure III-7

InitiatetemperaturecontrolbypressingtheTestConnection.Theconnectionstatuswillbeconrmed

withamessageboxandtheappearanceofthebathiconinthestatusbar(seeSectionII.3).

The Default Temperature is the temperature value that the control device will return to at the

conclusionofaTest.Thisvalueissetonlyifthecheckboxischecked.Whenthecheckboxis

unchecked,thetemperaturecontrollerwillholdatthelastsetpointusedintheTest.

TIP:Whenatestinvolvesseveraltemperaturesetpoints,settheDefaultTemperaturetotherst

setpointusedintheTest.ThiswillreducethetransitiontimefromoneTestruntothenext

Testrun.

III.6 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DV3T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DV3Tiscapableofcollectingmultipledatapointsforcomprehensiveanalysis

ofowbehavior.

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

SolutionstoStickyProblems”.

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Brookfield DV3T Rheometer Manual do Utilizador Página 31