Table of Contents
Advertisement
3. MAKING VISCOSITY MEASUREMENTS
3.1 Quick start
The DVNext Rheometer uses the same methodology for viscosity measurements as previous AMETEK Brookfield
instruments. If you have experience with other AMETEK Brookfield equipment, this section will give you quick steps
for taking a viscosity reading. If you have not used a AMETEK Brookfield Rheometer before, skip this section and go
to Section 4.2 for a detailed description.
•
Assemble DVNext Rheometer (Section 2-2).
•
Turn power on.
•
There will be a prompt to level the DVNext, if not already level. Follow instructions on screen. (Section 2.2)
•
Autozero the rheometer (Section 2.2.1).
•
The DVNext will display the Configure Viscosity Test Screen. In this screen, select spindle and speed.
Confirm that Data Collection is set to Single Point and End Condition is set to Time 00:00:00.
•
Attach the spindle to the coupling nut.
•
Note: Left-hand thread. If equipped with magnetic coupling, use the appropriate procedure to connect
the spindle (see Section 3.5).
•
Immerse the spindle gently into the test sample by lowering the DVNext on the Model G laboratory stand.
•
Press the Run button. The screen will change to the Running Viscosity Test Screen.
•
When ready to record the measurement results, press the Stop Test button. The screen will change to the
Results Table. Record the % torque and viscosity.
•
To run another test, press Configure Test. To return to the Home Menu, press the Home Icon.
3.2 Preparations for making measurements
•
RHEOMETER: The DVNext should be turned on, leveled and autozeroed. The level is adjusted using the
two feet on the bottom of the base and confirmed through aligning the digital bubble on the screen with
the center of the leveling circle. Adjust the feet until the bubble is inside the center target. Set the level
prior to autozero. The proper level is essential for correct operation of the DVNext.
•
SAMPLE: The fluid to be measured (sample) must be in a container. The standard spindles supplied with
the DVNext [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 8.25 cm). The same applies to the optional RV1, HA/
HB1, and Vane spindles. Many other spindle systems are supplied from AMETEK Brookfield with specific
sample chambers such as the Small Sample Adapter, UL Adapter and Thermosel.
AMETEK Brookfield recommends that you use the appropriate container for the selected spindle. You may choose
an alternate container for convenience; however, this may influence the measured viscosity. The DVNext is calibrated
considering the specified container.
Alternate containers will provide results that are repeatable but may not be "true".
The LV (1-4) and RV (1-7) are designed to be used with the guard leg attached. Measurements made without the
guard leg will provide repeatable results but may not provide "true" results.
When comparing data, be sure to specify the sample container and presence/absence of the guard leg.
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.
M19-2101 REVISION 2.0
D V N E X T R H E O M E T E R - O P E R AT I O N A L M A N U A L
28
Advertisement
Table of Contents
