Brookfield DV-I Prime Instrukcja Użytkownika Pobierz pdf (Strona 20)

Brookeld Engineering Laboratories, Inc. Page 20 Manual No. M/07-022-D0613

cP 78.0 S01

10 RPM20 % 7.8

Figure II-14

Negative % (Torque) will be displayed as shown in Figure II-15:

cP ---- S01

10 RPM20 % -0.2

Figure II-15

Viscosity values will be displayed as “- - - -” when the % (Torque) is below zero.

II.8 Operation

The following procedure is outlined for making a viscosity measurement in a 600 mL low form

Grifn beaker.

1. Mount the guardleg on the DV-I PRIME Viscometer (LV and RV series). Attach the spindle

to the lower shaft. 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.

2. Insert and center spindle in the test material until the uid’s level is at the immersion

groove in 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 surface. You

may nd it more convenient to immerse the spindle in this fashion before attaching

it to the Viscometer.

3. To make a viscosity measurement, select the desired speed setting. 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, readings below 10% should be avoided. Additional information on

making viscosity measurements is available in Appendix C or the Brookeld publication

“More Solutions to Sticky Problems”.

4. Record the reading and relevant test parameters. Brookeld recommends you record both

% torque and viscosity in centipoise. Relevant test parameters might include: viscometer

model, spindle, speed, temperature, container and time of test.

5. Press the

MOTOR ON/OFF key to turn the motor “OFF” when changing a spindle or changing

samples. Remove spindle and guardleg before cleaning. Clean spindles and guardleg after

use, see Section I.8 for general cleaning recommendations.

6. 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 C: Variables in Viscosity Measurements.

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