Brookfield DV2+Pro Viscometer Manual de usuario descargar pdf (Pagina 84)

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101

Brookeld Engineering Labs., Inc. Page 84 Manual No. M03-165-F0612

Sample Adapter, UL Adapter, Thermosel, Spiral Adapter, and DIN Adapter the accuracy value

may be increased. In general the increase in accuracy will be minimal, however, it could be as

much as 1% for a total accuracy of +/- 2% of the range in use.

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

Example:

Calculate the acceptable range of viscosity using RVDV-II+Pro 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 Viscometer

is operating correctly. Any reading outside these limits may indicate a Viscometer 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 LVDV-

II+ Pro 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 viscometer.

 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 viscometer

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

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Brookfield DV2+Pro Viscometer Manual de usuario Pagina 84

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