Brookfield DV3T Rheometer Instrukcja Użytkownika Pobierz pdf (Strona 111)

Brookeld Engineering Labs., Inc. Page 111 Manual No. M13-2100

BrookeldViscosityStandardsFluidsareaccurateto(+/-)1%oftheirstatedvalue.

Example:

 CalculatetheacceptablerangeofviscosityusingDV3TRVwithRV-3Spindleat

2RPM;BrookeldStandardFluid12,500withaviscosityof12,257cPat25°C:

1) Calculatefullscaleviscosityrangeusingtheequation:

Full Scale Viscosity Range [cP] = TK

SMC

10,000

RPM

Where:

TK-1.0fromTable D-2

SMC=10fromTable D-1

Full Scale Viscosity Range

10,000

50,000 cP

 Theviscosityisaccurateto(+/-)500cP(whichis1%of50,000)

2) Theviscositystandarduidis12,257cP.Itsaccuracyis(+/-)1%of12,257or

 (+/-)122.57cP.

3) Totalallowableerroris(122.57+500)cP=(+/-)622.57cP.

4) Therefore,anyviscosityreadingbetween11,634.4and12,879.6cPindicatesthattheRheometer

isoperatingcorrectly.AnyreadingoutsidetheselimitsmayindicateaRheometerproblem.

ContacttheBrookeldtechnicalsalesdepartmentoryourlocalBrookelddealer/distributor

withtestresultstodeterminethenatureoftheproblem.

Example:

Calculate the acceptable accuracy for viscosity measurement using DV3TLV

withSC4-21spindleinSmallSampleAdapterat6,12,and30RPM.Brookeld

viscositystandarduid100cPshasanactualvalueof101.5cPat25ºC.

1) Calculate thefullscaleviscosity range eitherbyusing the SpindleRangeCoefcientin

AppendixBofMoreSolutionstoStickyProblemsorbyusingtheAutoRangebuttononyour

rheometer.

 TheSpindleRangeCoefcientforthe21spindleonanLVTorqueinstrumentis4,688.

 At6RPM,theFullScaleRange(FSR)viscosityis781cP.Allow+/-1%fortherheometer

and+/-1%fortheSmallSampleAdapter.Totalallowableaccuracyis:

  +/-2%x781cP=+/-15.6cP

 Asimilarcalculationat12RPMgivesFSR=391cP:+/-2%x391cP=+/-7.8cP

 Asimilarcalculationat30RPMgivesFSR=156cP:+/-2%x156cP=+/-3.1cP

2) TheViscosityStandardFluidis101.5cP.Itsaccuracyis:

  +/-1%x101.5cP=+/-1.015cPorroughly+/-1.0cPforfurthercalculations.

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Brookfield DV3T Rheometer Instrukcja Użytkownika Strona 111