Brookeld Engineering Labs., Inc. Page 77 Manual No. M13-167-B0614
However,instrumentaccuracyis±2%ofthemaximumviscosityrangeandnot
Brookfield Engineering Labs., Inc.Page 3 Manual No. M/97-164-F1 102 I. INTRODUCTION The Brookfield Programmable DV-II+ Viscometer measures fluid viscosity at given shear rates. Viscosity is a measure of a fluid’s resistance to flow.
Calibration Procedure for Cone/Plate Viscometers
1)Followtheaboveproceduresformechanicallyadjustingthesettingoftheconespindle
2)RefertoAppendixA;TableA-1,anddeterminethecorrectsamplevolumerequired
3)Selectaviscositystandarduidthatwillgiveviscosityreadingsbetween10%and
100%offullscalerange.RefertoAppendixBforviscosityrangesofconespindles.
ConsultwithBrookeldoranauthorizeddealertodeterminewhichuidisappropriate.
Itisbesttouseaviscositystandarduidthatwillbeclosetothemaximumviscosity
DV2TLVViscometer,ConeCP-42,Fluid10
At60RPM,thefullscaleviscosityrangeis10.0cP.Thus,theViscometerreading
shouldbe97%torqueand9.7cPviscosity±0.197cP(0.1cPfortheviscometerplus
0.097cPfortheuid).TheaccuracyisacombinationofViscometeranduidtolerance
(refertoInterpretationofCalibrationTestResults).
4)Withtheviscometerstopped,removethesamplecupandplacetheviscositystandard
uidintothecup,waiting10minutesfortemperatureequilibrium.
5)ConnectthesamplecuptotheViscometer.Allowsufcienttimefortemperatureto
reachequilibrium.Typically15minutesisthemaximumtimethatyoumustwait.Less
timeisrequiredifspindleandcuparealreadyattesttemperature.
6)MeasuretheviscosityandrecordtheViscometerreadinginboth%torqueandcentipoise
Notes:1)Thespindlemustrotateatleastve(5)timesbeforeaviscosity
2)TheuseofBrookeldViscosityStandarduidsintherangeof5cPto
5000 cP is recommended for cone/plate instruments. Please contact
BrookeldEngineeringLaboratoriesoranauthorizeddealerifyour
calibrationprocedurerequiresmoreviscousstandards.
3)Selectaviscositystandarduidthatwillgiveviscosityreadingsbetween
10%and100%offullscalerange.RefertoAppendixBforviscosity
rangesofconespindles.Donotuseasiliconeviscositystandarduid
withaviscosityvaluegreaterthan5000cPwithaCone/PlateViscometer.
Brookeldoffersacompleterangeofmineraloilviscositystandards
suitableforusewithCone/PlateViscometersasshowninTableE-2.
ConsultwithBrookeldoranauthorizeddealertodeterminewhichuid
Interpretation of Calibration Test Results:
WhenverifyingthecalibrationoftheDV2T,theinstrumentandviscositystandarduid
errormustbecombinedtocalculatethetotalallowableerror.
TheDV2Tisaccurateto(+/-)1%oftherangeinusewhenusingspindlesLV#1-3,RV
#2-6,HA#2-6andHB#2-6.WhenusinganaccessorydevicewiththeDV2Tsuchas
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Brookfield Engineering Labs., Inc.
Page 76
Manual No. M13-167-B0614
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 fluid 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,
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 five (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:
Brookfield Rvt Viscometer Manual
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) Brookfield
spindles outlined above.
2) T-Bar spindles should not be used for verifying calibration of the DV2T
Viscometer.
Calibration Procedure for Spiral Adapter
Brookfield 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 fluid (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 flooded.
4) The viscosity standard fluid, together with the spindle, should be immersed in
the bath for a minimum of 1 hour, stirring the fluid periodically (operate at 50 or
60 RPM periodically), prior to taking measurements.
5) After 1 hour, check the temperature of the viscosity standard fluid with an accurate
thermometer.
6) If the fluid is at test temperature (
+
/- 0.1
°
C of the specified temperature, normally
25
°
C), measure the viscosity and record the viscometer reading.
Note: The spindle
must rotate at least five (5) times for one minute, whichever is greater before readings are
taken.
7) The viscosity reading should equal the cP value on the viscosity fluid standard
to within the combined accuracies of the viscometer and the standard (as
Brookfield Dv2t Viscometer Manual 2017
discussed in the section entitled, Interpretation of Calibration Test Results).
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