Brookfield DV1 User Manual

Brookeld Engineering Laboratories, Inc. Page 35 Manual No. M14-023
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 Brookeld 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; ranges listed
apply to CPA cones.
Do not use a silicone viscosity standard uid with a viscosity value greater than 5000 cP with a
Cone/Plate. Brookeld oers 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 F-1 and
F-2 in Appendix F for a list of available uids.
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: DV1MLV Viscometer, Cone Spindle CPA-42Z, 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. us, the viscometer reading should be
97% torque and 9.7 cP viscosity ± 0.197 (closer to ±0.2) cP. e accuracy is a combination of
viscometer and uid tolerance (refer to Interpretation of Calibration Test Results at the end of
Appendix E).
3. With the motor o, remove the sample cup and place the viscosity standard uid into the cup.
Cone Part No. Sample Volume
CPA-40Z, CPE-40, CP-40 0.5 mL
CPA-41Z, CPE-41, CP-41 2.0 mL
CPA-42Z, CPE-42, CP-42 1.0 mL
CPA-51Z, CPE-51, CP-51 0.5 mL
CPA-52Z, CPE-52, CP-52 0.5 mL
Table A-1
4. Attach the sample cup to the viscometer and allow sucient 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: e cone spindle must rotate at least ve (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
specic viscosity standard uid(s) that you are using.
* e CPA or CPE designation on the cone spindle indicates use with Electronic Gap Setting
Cone/Plate Viscometers/Rheometers only.

Brookfield DV1 Specifications

General

Speed Range	0.3 to 100 rpm
Display	LCD
Number of Speeds	18
Power Supply	100-240 VAC, 50/60 Hz
Viscosity Range	1 to 2, 000, 000 cP
Temperature Measurement	Optional
Accuracy	±1% of full scale range
Repeatability	+/- 0.2%