Brookfield DV3T Rheometer Uživatelský manuál stáhnout pdf (Strana 47)

Brookeld Engineering Labs., Inc. Page 47 Manual No. M13-2100

IV. MAKING YIELD MEASUREMENTS

IV.1 Quick Start

TheDV3TRheometerusesthesamemethodologyforyieldmeasurementsastheBrookeldYR-1

andDV-IIIUltraRheometers.IfyouhaveexperiencewithotherBrookeldequipment,thissection

willgiveyouquicksteps for makingayieldmeasurement.IfyouhavenotusedaBrookeld

Rheometerbefore,skipthissectionandgotoSectionIV.2foradetaileddescription.

A) AssembleandleveltheDV3TRheometer(SectionI.4).

B) Turnpoweron.

C) Autozerotherheometer(SectionII.2).

D) TheDV3TwilldisplaytheCongureViscosityTestScreen.PresstheHomeIconin

theNavigationBar.FromtheHomeMenu,selectCongureYieldTest.

E) Select:Spindle,ImmersionMark,andRunSpeed.

F) AttachthevanespindletotheDV3T.

NOTE: Left-hand thread. IfequippedwithEZ-Lock,usetheappropriateprocedure

toconnectthespindle(seeSectionIII.3).Immersethespindlegentlyintothetest

samplebyloweringtheDV3TontheModelGlaboratorystand.

G) PresstheRunbutton.ThescreenwillchangetotheRunningYieldTestScreen.

H) When theYieldTest iscomplete, theDV3Twillpresent theYieldTest Complete

screen.RecordtheStress(yieldstress),Torque,andTemperature.

I) Torunanothertest,pressCongureTest.ToreturntotheHomeMenu,pressthe

Home Icon.

IV.2 Preparations for Making Measurements

 A) RHEOMETER:TheDV3Tshouldbeturnedon,leveledandautozeroed.Thelevelisadjusted

usingthetwofeetonthebottomofthebaseandconrmedusingthebubblelevelonthefront

ofthehead.Adjustthefeetuntilthebubbleisinsidethecentertarget.Setthelevelpriorto

autozeroandcheckthelevelpriortoeachmeasurement.

The proper level is essential for correct operation of the DV3T.

 B) Sample:Themeasuredyieldvalueisverydependentonhowthesampleishandledpriortothe

measurement.Thesampleshouldbedisturbedaslittleaspossiblepriortoinsertingthevane

spindle.Brookeldrecommendstestingthesampleinthecontainerinwhichitisprovidedwhen

possible.Ifitisnecessarytotransferthesampletoanewcontainer,thenitisrecommendedto

includeapre-shearand/orwaittimeintheYieldTest.Thispre-shearandwait-timewillprovide

acommonhistorytoeachsampletoaidinsampletosamplecomparison.

  Brookeldrecommendstheuseofvanespindlesformeasuringyieldvalue.Thevanespindle

providesauniquegeometrythatminimizesdisturbanceofthesampleduringspindleinsertion.

  Many samplesmust be controlled to a specic temperaturefor yield measurement.  When

conditioningasamplefortemperature,besuretotemperaturecontrolthecontainerandspindle

aswellasthesample.

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Brookfield DV3T Rheometer Uživatelský manuál Strana 47