Cannon Instrument CMRV-4500 - Manual (Page 68)

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CANNON ® Mini-Rotary Viscometer CMRV-4500 Instruction & Operation Manual
Version 1.1e—October, 2011 • CANNON ® Instrument Company
2139 High Tech Road • State College, PA • 16803 • USA
5. At the conclusion of the temperature profile you are ready to test
samples. See Chapter 11 for the test procedure.
Profile operation notes
Instrument Status window During the profile, the Instrument View window will display the current
status of the profile, the current test temperature, the desired temperature,
time elapsed, and the time remaining until the yield stress and viscosity
tests should be run. Display data is normally updated every 0.5 seconds.
The following status options are available:
RED– Fatal Instrument Fault (unlikely); Instrument stops responding to
queries for more than 60 seconds (or 385 seconds during a Viscosity
Test)
YELLOW– Instrument Warmup (displayed for 45 minutes after turning
on instrument). During this time, instrument calibration cannot be
performed. A test can be run on a calibrated instrument only if the
“Ignore Instrument Warmup” box is checked in the instrument view.
GREEN– Normal Instrument Operation
Removing thermometer To reduce the chance of separating the mercury column, you may wish to
remove the calibrated thermometer from the CMRV unit prior to running
a cooling profile. Store the thermometer in a vertical position. You may
replace the calibrated thermometer when the CMRV has cooled to 30°C or
lower. If the thermometer is not in place during CMRV-4500 cooling, you
should seal the thermometer hole in the Plexiglas
® cover, particularly when
the humidity of the ambient air is high. Otherwise, moisture may condense
on the top of the block.
Verifying temperature When the profile has concluded, verify the temperature reading and then
measure the yield stress and viscosity.
Tolerance problems If the CMRV instrument fails to maintain temperatures within required
tolerances during the profile, the MRVW software will display a warning.
The profile will be completed, but displays and printouts of CMRV data
will indicate that the profile was out of tolerance.
Completing CMRV tests Viscosity and yield stress tests should be completed shortly after the
completion of the profile.
NOTES ASTM D 4684 requires completion of yield stress and viscosity tests
within 30 minutes of the conclusion of the profile.
If, at the conclusion of a test, the block temperature is more than 0.2°C
cooler or warmer than the specified test temperature then the test may
not conform to ASTM D 4684 or ASTM D 3829 requirements. Consult
the appropriate ASTM method for additional information. If the test is out
of tolerance the temperature probe may have to be recalibrated and the
test rerun to obtain reliable readings for the desired temperature. Yield
stress and viscosity tests may still be performed for the samples, but the
calculated values will be indicative of the actual temperature at the end
of the profile, not the desired temperature.