Brookfield DV2T - A.4 Verifying Calibration

Brookeld Engineering Labs., Inc. Page 62 Manual No. M13-167
A.4 Verifying Calibration
1. Determinetheappropriatesamplevolume.RefertoTableA-1todeterminethecorrectsample
volumerequiredforthespindletobeutilized.
2. SelectaBrookeldViscosityStandarduidthatwillgiveviscosityreadingsbetween10%and
100%offullscalerange.RefertoAppendix B for viscosity ranges of cone spindles.
 BrookeldusesmineraloilviscositystandarduidstocalibrateWellsBrookeldCone/Plate
Viscometersatthefactory.Brookeldrecommendsthatcustomersusemineraloilviscosity
standarduidswhenyouperformacalibrationcheck.
 Ifyoudecidetouseasiliconeviscositystandarduid,donotuseauidwithaviscosityvalue
greaterthan5000cPwithaCone/Plate.Brookeldoffersacompleterangeofmineraloilviscosity
standardssuitableforusewithCone/Platesforviscositiesabove5,000cPorshearratesabove
500 sec
-1
;seeTableE-2inAppendixEforalistofavailableuids.
 Itisbesttouseaviscositystandarduidthatwillbeclosetothemaximumviscosityforagiven
cone spindle/speed combination.
Example: DV2TLVViscometer,ConeSpindleCPA-42Z,BrookeldSiliconeViscosityStandard
havingaviscosityof9.7cPat25°C
 At60RPM,thefullscaleviscosityrangeis10.0cP.Thus,theViscometerreadingshouldbe
97%torqueand9.7cPviscosity±0.197cP.Theallowableerror(±0.197cP)isacombination
ofViscometeraccuracyanduidtolerance(refertoInterpretation of Calibration Test Results
inAppendixE).
3. Withthemotoroff,removethesamplecupandplacetheviscositystandarduidintothecup.
Table A-1
Cone Part No.
CPA-40Z, CPE-40, CP-40
CPA-41Z, CPE-41, CP-41
CPA-42Z, CPE-42, CP-42
CPA-51Z, CPE-51, CP-51
CPA-52Z, CPE-52, CP-52
Sample Volume
0.5 mL
2.0 mL
1.0 mL
0.5 mL
0.5 mL
4. AttachthesamplecuptotheViscometerandallowsufcienttimeforthesample,cupandcone
toreachtemperatureequilibrium.
5. Turnthemotoron.Setthedesiredspeed(s).Measuretheviscosityandrecordthereadingin
both%torqueandcentipoise(cP).
6. Verifythattheviscosityreadingiswithintheallowable1%deviation,asexplainedearlier,for
thespecicviscositystandarduid(s)thatyouareusing.
 TheCPEorCPAdesignationontheconespindleindicatesusewithElectronicGapSettingCone/
PlateViscometers/Rheometersonly.