Brookfield DV-E Viscometer Bedienungsanleitung PDF herunterladen (Seite 16)

Brookeld 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 following procedure is outlined for making a viscosity measurement in the recommended 600

mL low form Grifn beaker.

1. Insert and center spindle in the test material until the uid’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.

(Brookeld 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 rmly 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 uid. For maximum accuracy, ashing readings below 10% should be avoided.

Additional information on making viscosity measurements is available in Appendix B or

the Brookeld 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.

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