Brookfield DV2+Pro Viscometer - Manual (Page 82)

Brookfield Engineering Labs., Inc. Page 82 Manual No. M03-165-F0612
When a UL or DIN UL Adapter is used, the water bath is stabilized at the proper temperature:
1) Put the proper amount of viscosity standard fluid into the UL Tube. (Refer to the UL Adapter
instruction manual).
2) Attach the spindle (with extension link and coupling nut) onto the DV-II +Pro .
3) Attach the tube to the mounting channel.
4) Lower the tube into the water bath reservoir, or if using the ULA-40Y water jacket, connect
the inlet/outlets to the bath external circulating pump.
5) Allow 30 minutes for the viscosity standard, sample chamber and spindle to reach test temperature.
6) Measure the viscosity and record the Viscometer reading.
Note: The spindle must rotate at
least five (5) times before readings are taken.
Calibration Procedure using a Helipath Stand and T-Bar Spindles
When a Helipath Stand and T-Bar spindles are used:
1) Remove the T-bar spindle and select a standard LV (#1-3) or RV, HA, HB (#1-6) spindle. Follow
the procedures for LV (#1-3) and RV, HA, HB (#1-6) Brookfield spindles outlined above.
2) T-Bar spindles should not be used for verifying calibration of the DV-II +Pro Viscometer.
Calibration Procedure for Spiral Adapter
Brookfield recommends a two step check. First verify the calibration of the viscometer using the
standard viscometer spindles (LV #1-3, RV #2-6, HA #2-6 and HB #2-6 or cone/plate spindles)
as detailed in this appendix. Second verify the calibration of the viscometer using the Spiral
Adapter. The use of an accessory device may increase the accuracy of measurement associated
with the DV-II+Pro.
1) Place the viscosity standard fluid (in the proper container) into the water bath.
2) Attach the spindle to the viscometer. Attach chamber (SA-1Y) and clamp to the viscometer.
3) Lower the DV-II
+ Pro into measurement position. Operate the viscometer at 50 or 60 RPM
until the chamber is fully flooded.
4) The viscosity standard fluid, together with the spindle, should be immersed in the bath for a
minimum of 1 hour, stirring the fluid periodically (operate at 50 or 60 RPM periodically), prior
to taking measurements.
5) After 1 hour, check the temperature of the viscosity standard fluid with an accurate thermometer.
6) If the fluid is at test temperature (
+ /- 0.1 ° C of the specified temperature, normally 25 ° C),
measure the viscosity and record the viscometer reading. Note: The spindle must rotate at least
five (5) times for one minute, whichever is greater before readings are taken.
7) The viscosity reading should equal the cP value on the viscosity fluid standard to within the
combined accuracies of the viscometer and the standard (as discussed in the section entitled,
Interpretation of Calibration Test Results). However, instrument accuracy is ±2% of the
maximum viscosity range and not the standard 1%.