Brookfield RVDV-II+Pro - Page 70

Brookeld Engineering Labs., Inc. Page 70 Manual No. M/03-165-D0410
3) Select a viscosity standard uid 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
Brookeld or an authorized dealer to determine which uid is appropriate.
It is best to use a viscosity standard uid 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
uid). The accuracy is a combination of Viscometer and uid tolerance (refer to Interpretation
of Calibration Test Results).
4) With the viscometer stopped, remove the sample cup and place the viscosity standard uid into
the cup, waiting 10 minutes for temperature equilibrium.
5) Connect the sample cup to the Viscometer. Allow sufcient 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 ve (5) times before a viscosity reading is
taken.
2) The use of Brookeld Viscosity Standard uids in the range of 5 cP to 5000 cP is
recommended for cone/plate instruments. Please contact Brookeld Engineering
Laboratories or an authorized dealer if your calibration procedure requires more
viscous standards.
3) Select a viscosity standard uid 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 uid with a viscosity
value greater than 5000 cP with a Cone/Plate Viscometer. Brookeld offers a
complete range of mineral oil viscosity standards suitable for use with Cone/Plate
Viscometers as shown in Table E2. Consult with Brookeld or an authorized
dealer to determine which uid is appropriate.
Interpretation of Calibration Test Results:
When verifying the calibration of the DV-II+Pro, the instrument and viscosity standard uid 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 LV1-4, RV2-7,
HA2-7 and HB2-7. When using an accessory device with the DV-II+Pro such as Small Sample
Adapter, UL Adapter, Thermosel, Spiral Adapter, and DIN Adapter the accuracy value may be
increased. In general the increase in accuracy will be minimal, however, it could be as much as
1% for a total accuracy of +/- 2% of the range in use.
Brookeld Viscosity Standards Fluids are accurate to (+/-) 1% of their stated value.