Brookfield DV1 User Manual

Brookeld Engineering Laboratories, Inc. Page 52 Manual No. M14-023
5) Measure viscosity and record the viscometer reading; include % and cP (mPa•s). Instrument
accuracy is ± 2% of the maximum viscosity range and not the standard 1%.
Calibration Check Procedure for Cone/Plate Viscometers
1) Follow the procedures outlined in Appendix A for mechanically adjusting the setting of
the cone to the plate.
2) Refer to Appendix A, Table A-1, and determine the correct sample volume required for
the spindle to be utilized.
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 oers a complete range of mineral oil viscosity standards
suitable for use with Cone/Plate Viscometers. See Table F-2 in Appendix F. It is best to
use a viscosity standard uid that will be close to the maximum viscosity for a given cone
spindle/speed combination.
DV1MLV 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. 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 this section).
4) With the viscometer stopped, remove the sample cup and place the viscosity standard
uid into the cup.
5) Connect the sample cup to the Viscometer. Allow sucient time for temperature to reach
equilibrium.
6) Measure the viscosity and record the Viscometer reading in both % torque and centipoise.
NOTE: e spindle must rotate at least ve (5) times before readings are taken.
Interpretation of Calibration Test Results:
When verifying the calibration of the DV1, the instrument and viscosity standard uid error must
be combined to calculate the total allowable error.
e DV1 is accurate to (+/-) 1% of any Full Scale spindle/speed viscosity range.
Brookeld Viscosity Standards Fluids are accurate to (+/-) 1% of their stated value.
Calculate the acceptable range of viscosity using DV1MRV with RV-3
Spindle at 2 RPM; Brookeld Standard Fluid 12,500 with a viscosity of
12,257 cP at 25°C:
Example 1:

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%