Cannon Instrument CMRV-5000 - Manual (Page 72)

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CANNON ® Mini-Rotary Viscometer CMRV-5000 Instruction & Operation Manual
Version 1.0b—August, 2011; CANNON ® Instrument Company
2139 High Tech Road • State College, PA • 16803 • USA
6. Ensure that a Sample ID has been entered for each sample. Then
click for the desired sample. OR use the Tab key to highlight
the yield stress icon and then press R. The Yield LED (light-
emitting diode) on the CMRV-5000 will glow and the Start Test
button will begin flashing rapidly.
7. Press the flashing Start Test button on the CMRV Controller front
panel and proceed immediately to step 8.
8. Slide the rotor locking pin upward to its detent position, allowing the
weight/hook-cage to hang free. The Yield LED will flash as the
CMRV microprocessor measures the wheel rotation (See Notes on
yield stress testing on the next page regarding the ASTM D 4684
method). If no yield stress is observed (sufficient rotation), the
blinking Yield Stress light on the instrument front panel will turn off.
If it does, conclude the test by lowering the locking pin to prevent
the rotor from further
rotation.
9. (Optional) If there is
insufficient movement of
the rotor during the 15-
second sampling period,
follow the screen prompts
to add weight to the hook-
cage per ASTM methodol-
ogy (see photo). The
CMRV-5000 will calculate
the range for the yield
stress value. If there has
not been adequate move-
ment of the rotor by the
time the weight load
reaches 100 grams, the
MRVW software will
calculate a minimum value
in Pascals for yield stress.
NOTES When adding weights to the hook-cage, support the hook cage with one
hand while keeping some tension on the thread. When releasing the hook
cage use a smooth downward motion of the hand to prevent the hook-
cage from swinging back and forth and to avoid jarring the rotor.
To view test results as soon as they have been recorded in the database,
open an MRV Data Table analysis with the Use Dynamic Update option
(see Chapter 13).
CAUTION Make sure to wait for the CMRV software prompts before adding addi-
tional weights.
10. If testing viscosity for the sample, follow the directions for viscosity
testing (see Measuring Apparent Viscosity, next page).
Adding a 10-gram weight to the
hook-cage during yield stress test