Brookfield DV3T - A.4 Verifying Calibration

Brookeld Engineering Labs., Inc. Page 93 Manual No. M13-167-A0415
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
Rheometers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F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: DV3TLVRheometer,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Rheometerreadingshouldbe
97%torqueand9.7cPviscosity±0.197cP.Theallowableerror(±0.197cP)isacombination
ofRheometeraccuracyanduidtolerance(refertoInterpretation of Calibration Test Results
inAppendixF).
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Rheometer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Rheometers/Rheometersonly.