Brookfield DV-II+ Programmable Viscometer - Manual (Page 17)

Brookfield Engineering Labs., Inc. Page 17 Manual No. M/97-164-F1 102
Figure 21
When printing via the parallel port, please note that if a printer is not attached to the viscometer,
the following screen appears:
PRINTER ERROR
CHECK CONNECTION
Figure 22
II.9 Making Viscosity Measurements
The following general procedure is used for making viscosity measurements. Brookfield recom-
mends the use of a 600 ml Low Form Griffin beaker when using LV/RV/HA/HB spindles.
1. Mount the guardleg on the DV-II+ Viscometer (LV and RV series) and insert into the container.
2. Insert and center spindle in the test material until the fluid's level is at the immersion groove on
the spindle's shaft. With a disc-type spindle, it is necessary to tilt the spindle slightly while
immersing to avoid trapping air bubbles on its surface. Attach the spindle to the lower shaft of
the viscometer. Lift the shaft slightly, holding it firmly with one hand while screwing the spindle
on with the other (note left-hand thread). Avoid putting side thrust on the shaft. Verify the proper
spindle immersion depth and that the viscometer is level.
3. The process of selecting a spindle and speed for an unknown fluid is normally trial and error. An
appropriate selection will result in measurements made between 10-100 on the instrument
% torque scale. Two general rules will help in the trial and error process.
1) Viscosity range is inversely proportional to the size of the spindle.
2) Viscosity range is inversely proportional to the rotational speed.
To measure high viscosity, choose a small spindle and/or a slow speed. If the chosen spindle/
speed results in a reading above 100%, then reduce the speed or choose a smaller spindle.
Experimentation may reveal that several spindle/speed combinations will produce satisfactory
results between 10-100%. When this circumstance occurs, any of the spindles may be selected.
For the case of CGS units with non-exponential results:
and CGS units with exponential results.
Similarly, for SI units with non-exponential results.
and SI units with exponential results.
M = Torque T = Temperature Z = Time
1 10 20 30 40 50 60 70 80
RPM=XXX M=XXXXX S=XX %=XXX.X cP=XXXXX D/CM2=XXXXX 1/SEC=XXXXX T=XX.XC ZXX=XX
RPM=XXX M=XXXXX S=XX %=XXX.X cP=XXXeX D/CM2=XXXeX 1/SEC=XXXXX T=XX.XC ZXX=XX
1 10 20 30 40 50 60 70 80
RPM=XXX M=XXXXX S=XX %=XXX.X mPas=XXXXX N/M2=XXXXX 1/SEC=XXXXX T=XX.XC ZXX=XX
1 10 20 30 40 50 60 70 80
1 10 20 30 40 50 60 70 80
RPM=XXX M=XXXXX S=XX %=XXX.X mPas=XXXeX N/M2=XXXeX 1/SEC=XXXXX T=XX.XC ZXX=XX