Brookfield DV3T Rheometer Manuel d'utilisateur télécharger pdf (Page 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”.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 124 125

Pas de commentaire

Brookfield DV3T Rheometer Manuel d'utilisateur Page 31