Brookfield DV-III Rheometer - Manual (Page 31)

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It is best to use a viscosity standard fluid that will be close to the maximum viscosity for a given
cone spindle/speed combination.
Example: LVDV-III Rheometer, Cone CP-42, Fluid 10
Having a viscosity of 9.7 cP at 25
°
C
At 60 RPM, the full scale viscosity range is 10.0 cP. Thus, the Rheometer reading should be
97% torque and 9.7 cP viscosity
±
0.197 (0.1 cP for the viscometer plus 0.97 cP for the fluid).
The accuracy is a combination of Rheometer and fluid tolerance (refer to Interpretation of
Calibration Test Results).
4) With the Rheometer stopped, remove the sample cup and place the viscosity standard fluid into
the cup.
5) Connect the sample cup to the Rheometer. Allow sufficient time for temperature to reach
equilibrium. Typically 15 minutes is the maximum time that you must wait. Less time is
required if the spindle and cup are already at test temperature.
6) Measure the viscosity and record the Rheometer reading in both % torque and centipoise (cP).
Notes: 1. Mineral oil viscosity standard fluids are recommended for use with Brookfield Cone/
Plate Viscometers when measuring at shear rates >500 sec-1 or when measuring
viscosity above 5000 cP.
2. The spindle must rotate at least five (5) times before a viscosity reading is taken.