Brookfield DV2T - Cone;Plate Calibration and Test Interpretation

Brookeld Engineering Labs., Inc. Page 76 Manual No. M13-167
Calibration Procedure for Cone/Plate Viscometers
1) Followtheaboveproceduresformechanicallyadjustingthesettingoftheconespindletothe
plate.
2) RefertoAppendixA;TableA-1,anddeterminethecorrectsamplevolumerequiredforthe
selected spindle.
3) Selecta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.Consultwith
Brookeldoranauthorizeddealertodeterminewhichuidisappropriate.
 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CP-42,Fluid10
     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(0.1cPfortheviscometerplus0.097cPforthe
uid).TheaccuracyisacombinationofViscometeranduidtolerance(refertoInterpretation
ofCalibrationTestResults).
4) Withtheviscometerstopped,removethesamplecupandplacetheviscositystandarduidinto
thecup,waiting10minutesfortemperatureequilibrium.
5) ConnectthesamplecuptotheViscometer.Allowsufcienttimefortemperaturetoreach
equilibrium.Typically 15minutes is themaximum time thatyou mustwait.  Lesstime is
requiredifspindleandcuparealreadyattesttemperature.
6) MeasuretheviscosityandrecordtheViscometerreadinginboth%torqueandcentipoise(cP).
Notes: 1) Thespindlemustrotateatleastve(5)timesbeforeaviscosityreadingis
taken.
  2) TheuseofBrookeldViscosityStandarduidsintherangeof5cPto5000cPis
recommendedforcone/plateinstruments.PleasecontactBrookeldEngineering
Laboratoriesoranauthorizeddealerifyourcalibrationprocedurerequiresmore
viscous standards.
 3) Selecta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.Donotuseasiliconeviscositystandarduidwithaviscosity
valuegreaterthan5000cPwithaCone/PlateViscometer.Brookeldoffersa
completerangeofmineraloilviscositystandardssuitableforusewithCone/Plate
ViscometersasshowninTableE-2.ConsultwithBrookeldoranauthorized
dealertodeterminewhichuidisappropriate.
Interpretation of Calibration Test Results:
WhenverifyingthecalibrationoftheDV2T,theinstrumentandviscositystandarduiderror
mustbecombinedtocalculatethetotalallowableerror.
TheDV2Tisaccurateto(+/-)1%oftherangeinusewhenusingspindlesLV#1-3,RV#2-6,
HA#2-6andHB#2-6.WhenusinganaccessorydevicewiththeDV2TsuchasSmall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.