Brookfield KU-2 - KU-2 Viscometer Calibration Procedures; Brookfield Viscosity Standards; Calibration Check Procedure

Brookeld Engineering Labs., Inc. Page 11 Manual No. M04-242-E1213
Appendix A - KU-2 Calibration Information
TheaccuracyoftheKU-2isveriedusingviscositystandarduidscalibratedinKrebsUnits,which
areavailablefrom BrookeldEngineeringLaboratoriesoryourlocalBrookelddealer/distributor/
representative.Note:Calibrationshouldnotbeveriedusingthecentipoisescale.Thecentipoise
scaleisforreferenceuseonlyandisbasedonacorrelationfromtheKrebsUnitdetailsintheASTM
testmethodD562.ViscosityStandardsarecalibratedat25°C.AvailablestandardsarelistedinTable
A-1below:
Table A-1
Brookeld Viscosity Standard Nominal Viscosity (KU) Temperature (°C)
KU61 61 25
KU73 73 25
KU87 87 25
KU99 99 25
KU106 106 25
Brookeld Viscosity Standards
WerecommendthatBrookeldViscosityStandardFluidsbereplacedinaccordancewiththeexpiration
dateonthelabel.Theseuidscanbestoredundernormallaboratoryconditions.Disposalshouldbe
inaccordancewithlocal,stateandfederalregulations.MaterialSafetyDataSheetsareavailableon
ourwebsite:www.brookeldengineering.com/support/documentation.
Calibration Check Procedure
Thefrequencyofthecalibrationcheckshouldbebasedonyourcompany'sstandardpracticefortest
andcalibrationofinstruments.
 1) SelectanytwoviscositystandardslistedinTableA-1toperformyourcalibrationcheck.The
viscositystandardsareverytemperaturesensitive.Theviscosityvalueoftheuidwillchange
withtemperaturesoitisimportanttocontrolthetemperatureto25.0°C.
Note:Donotuseviscositystandardscalibratedincentipoise.
 2) PourtheselecteduidintoastandardUS1-pintcan.Thespindleandtheuidinthecanshould
cometotemperatureequilibriumbeforeproceedingwiththecalibrationcheck.
It is important that the uid and the spindle come to 25.0°C, ± 0.1°C, before proceeding with
the calibration check.
 3) Oncetheuidandspindlehavecometothermalequilibrium,placethesamplecontaineronthe
viscometerbase,usingtheKU1-74adapter.Switchthepowerswitchandprinter(ifused)to
"ON".SwitchtheHoldReadingSwitchtothe"UP"position.TurntheSelectknobto"KU".
 4) Movetheviscometerhandledowntothelowestposition.Thespindlewillbeginrotatingonce
thehandleiswithin1/2inchofthelowestposition.
 5) Wait ve (5) seconds for the reading to stabilize.  Switch the HoldReading Switch to the
"DOWN"position.You will need to record measurements in KU and gm.Thesetwovalues
worktogethertoletyouinterpretthecalibrationresults.