Brookfield DV3T Rheometer Manual do Utilizador descarregar pdf (Página 62)

Brookeld Engineering Labs., Inc. Page 62 Manual No. M13-2100

CommunicationisestablishedwhentheTestConnectioncommandbuttonispressed.Youmust

pressthisbuttoneverytimetheDV3TRheometerispoweredon.Besurethatthetemperature

controlleristurnedonpriortopressingtheTestConnectionbutton.

TheDefaultTemperaturescreenalsoallowstheusertosetaDefaultTemperature.TheDefault

TemperatureisthesetpointvaluethatwillbeusedbytheDV3Twhenatest(ViscosityTestor

YieldTest)isnotinuse.TosettheDefaultTemperaturerst,enteratemperaturevalueandsecond

checktheDefaultBetweenTestscheckbox.

TIP:UseaDefaultTemperaturewhenthetestprogramincludesachangeintemperatureand

setthevalueequaltothersttemperaturecontrolpointinthetest.Attheconclusion

ofthetest,thecontroldevicewillberesettothersttemperaturesetpointwhichwill

minimizethetimerequiredbetweentests.

TheTemperaturescreenalsoallowsyoutochoosewhichtemperatureprobewillbeusedfordata

collectionandtemperaturecontrol.WhentheDV3Tiscontrollingtemperaturethroughanexternal

device,theremaybetwotemperatureprobesavailablefordatacollection:1)thetemperatureprobe

connected to the DV3T (Probe) and 2) the temperature probe associated with the temperature

controldevice(Controller).PresseitherProbeorControllerintheTemperaturemenu,gurethe

rstoneabove.

Printer Setup:TheDV3TisconguredforusewiththeDymo450printer.Nootherprinterscan

beutilizedwiththerheometer.PrinterSetupallowstheusertochoosefromthree

differentcongurationsforprintout.

LabelSmall:Asmalllabel(1.13inchx3.5inch)thatallowsforprintingoflimited

data for a single data point.  The label stock is available from

Brookeld;partnumberGV-1048.

LabelLarge: A large label (2.31inch x 4.0inch) that allows for printing of a

completesetofparametersforasingledatapoint.Thelabelstock

isavailablefromBrookeld;partnumberGV-1049.

Receipt: Acontinuousrollofpaperthatallowsforprintingofmultipledata

points.ThepaperstockisavailablefromBrookeld;partnumber

GV-1047.

ThePrinter Setupis selectedby touching thedesired conguration,which will

resultinabluecircletoappeartotheleftoftheitem.TheOKcommandkeymust

beselectedtoconrmthesetting.

AutoZero: AutoZeroisanoperationperformedby the DV3TRheometerautomaticallyduring

thepowerupsequence.Thisoperationsetstheinstrumenttransducertoacorrectzero

value.Thezerovalueshouldnotshiftovertime,however,iftheuserdeterminesthat

thezeroisnotcorrect,youcanforceanAutoZerotobeperformedwithoutpowering

downtherheometer.WhentheAutoZerofunctionisselected,theDV3Tisimmediately

setstoAutoZeromodeandtheuserispresentedwiththeAutoZeroscreen(FigureII-2).

Uponcompletion,theuserwillbereturnedtotheDeviceSetupmenu.

Oscillation Check: TheOscillationCheckisacheckoftheperformanceofthelowerbearingofthe

DV3TRheometer.ThislowerbearingiseitherPointandJewelorBallBearing.

Correctperformanceofthelowerbearingisessentialforproperoperationofthe

rheometer.Afailedlowerbearingwillnormallycauseviscositymeasurements

tobelowerthanexpected.

AnOscillationCheckisperformedasfollows:

• RemovethespindleandleveltheDV3TRheometer

• Gentlypushupontherheometercoupling.

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