Brookfield DV3T Rheometer Uživatelský manuál stáhnout pdf (Strana 109)

Brookeld Engineering Labs., Inc. Page 109 Manual No. M13-2100

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DV3T.

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Rheometer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 DV3T Rheometer.

Calibration Procedure for Spiral Adapter

Brookeldrecommendsatwostepcheck.First,verifythecalibrationoftherheometerusingthe

standardrheometer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rheometerusingtheSpiral

Adapter.Theuseofanaccessorydevicemayincreasetheaccuracyofmeasurementassociated

withtheDV3T.

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rheometer.Attachchamber(SA-1Y)andclamptotherheometer.

3) LowertheDV3Tintomeasurementposition.Operatetherheometer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rheometer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rheometer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%.

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