Brookfield RVDV-II+Pro - Page 69

Brookeld Engineering Labs., Inc. Page 69 Manual No. M/03-165-D0410
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 ve (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(#1-4) or RV,HA,HB(#1-7) spindle. Follow
the procedures for LV(#1-4) and RV,HA,HB(#1-7) Brookeld 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
Brookeld recommends a two step check. First verify the calibration of the viscometer using
the standard viscometer spindles (LV1-4, RV2-7, HA2-7 and HB2-7 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 uid (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 ooded.
4) The viscosity standard uid, together with the spindle, should be immersed in the bath for a
minimum of 1 hour, stirring the uid periodically (operate at 50 or 60 RPM periodically), prior
to taking measurements.
5) After 1 hour, check the temperature of the viscosity standard uid with an accurate
thermometer.
6) If the uid is at test temperature (
+/- 0.1°C of the specied temperature, normally 25°C),
measure the viscosity and record the viscometer reading. Note: The spindle must rotate at least
ve (5) times for one minute, whichever is greater before readings are taken.
7) The viscosity reading should equal the cP value on the viscosity uid 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%.
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 A1, and determine the correct sample volume required for the
selected spindle.