Brookfield DV2+Pro Viscometer - Manual (Page 83)

Brookfield Engineering Labs., Inc. Page 83 Manual No. M03-165-F0612
Calibration Procedure for Cone/Plate Viscometers
1) Follow the above procedures for mechanically adjusting the setting of the cone spindle to the
plate.
2) Refer to Appendix A, Table A-1, and determine the correct sample volume required for the
selected spindle.
3) Select a 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. Consult with
Brookfield or an authorized dealer to determine which fluid is appropriate.
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-II +Pro Viscometer, 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 Viscometer reading should be
97% torque and 9.7 cP viscosity ± 0.197 cP (0.1 cP for the viscometer plus 0.097 cP for the
fluid). The accuracy is a combination of Viscometer and fluid tolerance (refer to Interpretation
of Calibration Test Results).
4) With the viscometer stopped, remove the sample cup and place the viscosity standard fluid into
the cup, waiting 10 minutes for temperature equilibrium.
5) Connect the sample cup to the Viscometer. Allow sufficient time for temperature to reach
equilibrium. Typically 15 minutes is the maximum time that you must wait. Less time is
required if spindle and cup are already at test temperature.
6) Measure the viscosity and record the Viscometer reading in both % torque and centipoise (cP).
Notes: 1) The spindle must rotate at least five (5) times before a viscosity reading is
taken.
2) The use of Brookfield Viscosity Standard fluids in the range of 5 cP to 5000 cP is
recommended for cone/plate instruments. Please contact Brookfield Engineering
Laboratories or an authorized dealer if your calibration procedure requires more
viscous standards.
3) Select a 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. Do not use a silicone viscosity standard fluid with a viscosity
value greater than 5000 cP with a Cone/Plate Viscometer. Brookfield offers a
complete range of mineral oil viscosity standards suitable for use with Cone/Plate
Viscometers as shown in Table E-2. Consult with Brookfield or an authorized
dealer to determine which fluid is appropriate.
Interpretation of Calibration Test Results:
When verifying the calibration of the DV-II+Pro, the instrument and viscosity standard fluid error
must be combined to calculate the total allowable error.
The DV-II+Pro is accurate to (+/-) 1% of the range in use when using spindles LV #1-3, RV #2-
6, HA #2-6 and HB #2-6. When using an accessory device with the DV-II+Pro such as Small