Brookfield DV2T - Page 75

Brookeld Engineering Labs., Inc. Page 75 Manual No. M13-167
WhenaULorDINULAdapterisused,thewaterbathisstabilizedatthepropertemperature:
1) PuttheproperamountofviscositystandarduidintotheULTube(refertotheUL
Adapterinstructionmanual).
2) Attachthespindle(withextensionlinkandcouplingnut)ontotheDV2T.
3) Attachthetubetothemountingchannel.
4) Lowerthetubeintothewaterbathreservoir,orifusingtheULA-40Ywaterjacket,
connecttheinlet/outletstothebathexternalcirculatingpump.
5) Allow30minutesfortheviscositystandard,samplechamberandspindletoreachtest
temperature.
6) MeasuretheviscosityandrecordtheViscometerreading.Note: The spindle must rotate
at least ve (5) times before readings are taken.
Calibration Procedure using a Helipath Stand and T-Bar Spindles
 WhenaHelipathStandandT-Barspindlesareused:
1) RemovetheT-barspindleandselectastandardLV(#1-3)orRV,HA,HB(#1-6)spindle.
FollowtheproceduresforLV(#1-3)andRV,HA,HB(#1-6)Brookeldspindlesoutlined
above.
2) T-Bar spindles should not be used for verifying calibration of the DV2T Viscometer.
Calibration Procedure for Spiral Adapter
Brookeldrecommendsatwostepcheck.First,verifythecalibrationoftheviscometerusingthe
standardviscometerspindles(LV#1-3,RV#2-6,HA#2-6andHB#2-6orcone/platespindles)
asdetailedinthisappendix.Second,verifythecalibrationoftheviscometerusingtheSpiral
Adapter.Theuseofanaccessorydevicemayincreasetheaccuracyofmeasurementassociated
withtheDV2T.
1) Placetheviscositystandarduid(inthepropercontainer)intothewaterbath(referto
theSpiralAdapterinstructionmanual).
2) Attachthespindletotheviscometer.Attachchamber(SA-1Y)andclamptotheviscometer.
3) LowertheDV2Tintomeasurementposition.Operatetheviscometerat50or60RPM
untilthechamberisfullyooded.
4) The viscosity standard uid, together with the spindle, should be immersed in the
bathforaminimumof1hour,stirringtheuidperiodically(operateat50or60RPM
periodically),priortotakingmeasurements.
5) After1hour, checkthetemperatureof the viscositystandarduidwith an accurate
thermometer.
6) Iftheuidisattesttemperature(+/-0.1°Cofthespeciedtemperature,normally25°C),
measuretheviscosityandrecordtheviscometerreading. Note: The spindle must rotate
at least ve (5) times for one minute, whichever is greater before readings are taken.
7) TheviscosityreadingshouldequalthecPvalueontheviscosityuidstandardtowithin
thecombinedaccuraciesoftheviscometerandthestandard(asdiscussedinthesection
entitled,InterpretationofCalibrationTestResults).However,instrumentaccuracyis
±2%ofthemaximumviscosityrangeandnotthestandard1%.