Cannon HTHS Series II Instruction & Operation Manual

Cannon HTHS Series II Instruction & Operation Manual Manual pdf 26 page image

23CANNONCANNONCANNONCANNONCANNON® High-Temperature High-Shear Viscometer Series II Instruction & Operation ManualRevision 1.0d—June, 2011;CANNONCANNONCANNONCANNONCANNON® Instrument Company2139 High Tech Road • State College, PA 16803 • USACHAPTER7 CALIBRATIONOccasionally it may be necessary to recalculate the mathematical con-stants used by the High Shear Viscosity Calculator to calculate viscosity.A test protocol using CANNON-manufactured oil standards provides thedata necessary to derive the constant values. We will refer to this protocolas a calibration. The procedure is described in detail in the High ShearViscosity Calculator for Windows® Instruction Manual.CANNON standards CANNON Instrument Company produces a series of Newtonian viscos-ity standards designed specifically for calibration of the High Tempera-ture High Shear Viscometers such as the CANNON ® High-TemperatureHigh Shear Viscometer. They work equally well calibrating other instru-ments at this temperature. These standards cover the nominal range of2.0 to 7.0 mPa•s at 150°C.Viscosities for all standards sold by CANNON ® are based on the Na-tional Institute of Standards and Technology (NIST) value of 1.0016mPa•s(centipoise) for water at 20°C (68°F). We have been granted ISO9002 registration for the manufacture and certification of viscositystandards. Standards are available in 120, 470, and 940 mL bottles aswell as 3.8 and 19 L containers. These sizes correspond to 4 ounce, pint,quart, gallon and 5-gallon containers.Each calibration oil should be run in each cell following the normal testprocedure. For assistance in determination of appropriate test pressuresfor each cell, consult the High Shear Viscosity Calculator for Windows ®Instruction Manual.Capillary specifications The Cell Calibration Record on page 35 of this manual contains capillaryspecifications necessary to complete the calibration. The Record shouldbe updated by the user whenever a viscometer cell or capillary is re-placed. Input current data from the Cell Calibration Record into theHTHS Calculator per instructions in the software manual.NOTES As per ASTM D 5481, samples are to be run with a shear rate of1,400,000 reciprocal seconds (1.40 x 10 6 sec-1 ). Other shear rates areobtainable.Empirical testing has suggested that the volume of sample residue lefton the cell walls following the HTHS test will vary as a function of sampleviscosity. SAE J300 requires HTHS viscosities from 2.6 to 3.7 mPa•s.Because the HT75 standard has a nominal viscosity of 2.7 mPa•s andthe HT150 standard has a nominal viscosity of of 3.7 mPa•s, CANNON®recommends that the users initially calculate cell volumes using either ofthese standards. It is not necessary to recalculate the volume unless thestandards change or the viscometric cell(s) or capillaries are replaced.