Brookfield DV-E Viscometer User Manual
Page 16
Brookfield Engineering Labs., Inc.
Page 16
Manual No. M98-350-J0912
cP
360
10RPM
%
9.0
S02
Figure II-9
Negative % (Torque) will be displayed as shown in Figure II-10. Viscosity values will be displayed
as
“- - - -” when the % (Torque) is below zero.
cP ----
10RPM %-1.0
S02
Figure II-10
II.6 Operation
The foll
owing procedure is outlined for making a viscosity measurement in the recommended 600
mL low form Griffin beaker.
1. 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 sometimes necessary to tilt the
spindle slightly while immersing to avoid trapping air bubbles on its under side surface.
(Brookfield recommends that you immerse the spindle in this fashion before attaching it to
the Viscometer.)
2. Mount the guardleg on the DV-E Viscometer (LV and RV series). Be sure that the motor
is OFF before attaching the spindle. Select a spindle and attach it to the spindle coupling
nut. 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.
3. To make a viscosity measurement, select a speed and follow the instructions in Sections II.2
and II.3. Allow time for the indicated reading to stabilize. The time required for stabilization
will depend on the speed at which the Viscometer is running and the characteristics of the
sample fluid. For maximum accuracy, flashing readings below 10% should be avoided.
Additional information on making viscosity measurements is available in Appendix B or
the Brookfield publication
“More Solutions to Sticky Problems”
.
4. Switch the
MOTOR ON/OFF
switch to turn the motor “OFF” when changing a spindle or
changing samples. Remove spindle before cleaning.
5. Interpretation of results and the instrument’s use with non-Newtonian and thixotropic
materials is discussed in the booklet,
“More Solutions to Sticky Problems”
, and in Appendix
B - Variables in Viscosity Measurement.