Brookfield DV-III Ultra Rheometer - Manual (Page 28)

Brookfield Engineering Laboratories, Inc. Page 28 Manual No. M98-211-E0912
H) Press the ENTER button on the rheometer to run the test. The screen will then show “USE
SPINDLE #__”. Confirm that the correct spindle is attached to the rheometer and that the
sample is properly prepared and in position to begin the test. Press the ENTER button to start
the test.
I) After a few seconds, your PC will automatically show the Graphs page in the EZ-Yield software
program, indicating that the test has begun. The DV-III Ultra will send data to the PC and the
graph of the yield stress flow behavior will be captured. The Data page in the software will
record the actual numerical values for shear stress.
J) When the test is complete, a dialog box appears asking you to save the data that was just
acquired.
K) Subsequent tests can be started by either pushing the ENTER button on the DV-III Ultra or
by clicking the RUN button in the EZ-Yield software.
III.2 Preparations for Making Measurements
A) RHEOMETER: The DV-III Ultra should be turned on, leveled and auto zeroed. The level is
adjusted using the three feet on the bottom of the base and confirmed using the bubble on the
top of the head. Adjust the feet until bubble is inside the center target. Set the level prior to
autozero and check the level prior to each measurement.
Proper level is essential for correct operation of the DV-III Ultra.
B) SAMPLE: The fluid to be measured (sample) must be in a container. The standard spindles
supplied with the DV-III Ultra (LV (1-4), RV (2-7), or HA/HB (2-7)) are designed to be used
with a 600 ml low form Griffin beaker (or equivalent container with a diameter of 8.25cm).
The same applies to the optional RV1, HA/HB1, and Vane spindles. Many other spindle
systems are supplied from Brookfield with specific sample chambers such as the Small Sample
Adapter, UL Adapter and Thermosel.
Brookfield recommends that you use the appropriate container for the selected spindle. You
may choose to use an alternate container for convenience, however, this may have an effect
on the measured viscosity. The DV-III Ultra is calibrated considering the specified container.
Alternate containers will provide results that are repeatable but not "true."
The LV (1-4) and RV (1-7) are designed to be used with the guardleg attached (see Appendix
F). Measurements made without the guardleg will provide repeatable results but may not
provide "true" results.
When comparing data with others, be sure to specify the sample container and presence/
absence of the guardleg.
Many samples must be controlled to a specific temperature for viscosity measurement. When
conditioning a sample for temperature, be sure to temperature control the container and spindle
as well as the sample.
Please see our publication, "More Solutions to Sticky Problems", for more detail relating to
sample preparation.
C) SPINDLE ATTACHMENT: The method of spindle connection to the DV-III Ultra is specified
at the time of order as either Standard Threaded Shaft or EZ-Lock. The spindle connection
method may be changed by sending the DV-III Ultra to Brookfield or our authorized agents.
There is an adapter available to convert Standard Threaded Spindles to EZ-Lock Spindles. It
is not possible to use EZ-Lock Spindles on a Standard Threaded Unit.