Brookfield DV2+Pro Viscometer Manual do Utilizador descarregar pdf (Página 82)

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Brookeld Engineering Labs., Inc. Page 82 Manual No. M03-165-F0612

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 DV-II

+Pro.

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 DV-II

+Pro 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 DV-II+Pro.

 1) Placetheviscositystandarduid(inthepropercontainer)intothewaterbath.

2) Attachthespindletotheviscometer.Attachchamber(SA-1Y)andclamptotheviscometer.

3) Lower the DV-II

+Pro 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%.

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