Brookfield DV-I Prime - Manual (Page 46)

Brookfield Engineering Laboratories, Inc. Page 46 Manual No. M/07-022-D0613
A.5 Verifying Calibration
1. Determine the appropriate sample volume. Refer to Table A-1 to determine the correct sample
volume required for the spindle to be utilized.
2. Select a Brookfield Viscosity Standard fluid that will give viscosity readings between 10% and
100% of Full Scale Range. Refer to Appendix B for viscosity ranges of cone spindles; ranges
listed apply to CPE cones.
Do not use a silicone viscosity standard fluid with a viscosity value greater than 5000 cP with a
Cone/Plate. Brookfield offers a complete range of mineral oil viscosity standards suitable for
use with Cone/Plates for viscosities above 5,000 cP or shear rates above 500 sec -1 ; see Table E-1
and E-2 in Appendix E for a list of available fluids.
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-I PRIME Viscometer, Cone Spindle CPE-42, Brookfield Silicone
Viscosity Standard having a viscosity of 9.7 cP at 25°C.
At 60 RPM, the Full Scale Viscosity Range is 10.0 cP. Thus, the viscometer reading should be
97% torque and 9.7 cP viscosity ± 0.197 (closer to ±0.2) cP. The accuracy is a combination of
viscometer and fluid tolerance (refer to Interpretation of Calibration Test Results at the end
of Appendix E).
3. With the motor off, remove the sample cup and place the viscosity standard fluid into the cup.
Cone Part No. Sample Volume
CPE-40 0.5 mL
CPE-41 2.0 mL
CPE-42 1.0 mL
CPE-51 0.5 mL
CPE-52 0.5 mL
Table A-1
4. Attach the sample cup to the viscometer and allow sufficient time for the sample, cup and cone
to reach temperature equilibrium.
5. Turn the motor on. Set the desired speed(s). Measure the viscosity and record the reading in
both % torque and centipoise (cP).
NOTE:
The cone spindle must rotate at least five (5) times before a viscosity reading is
taken.
6. Verify that the viscosity reading is within the allowable 1% deviation, as explained earlier, for
the specific viscosity standard fluid(s) that you are using.
* The CPE designation on the cone spindle indicates use with Electronic Gap Setting Cone/Plate
Viscometers/Rheometers only.