Cannon Instrument CMRV-5000 - Manual (Page 68)

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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
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-5000 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 warn-
ing. 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.
Adjusting temperature at the end of a profile
In the event that the CMRV instrument fails to attain the desired tem-
perature at the conclusion of a profile, it is possible to adjust the instru-
ment temperature using the following procedure:
1. Wait until the profie is completed and the Temperature Correction
button is active.