Brookfield DV3T - III.6 Multiple Data Points

Brookeld Engineering Labs., Inc. Page 31 Manual No. M13-167-A0415
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.
NotethattemperaturecontrollerscanalsobecontrolledthroughtheRheocalcTsoftwarewhen
theyareconnectedtothecomputerusingthepropercable.TheThermoselrequirestheHT-106
cable(RS-232),availablefromBrookeld.Thewaterbathrequiresthe225-173cable(RS-232),
whichcomeswiththebath.
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