Cannon Instrument CMRV-5000 - Manual (Page 113)

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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
CHAPTER
A
APPENDIX A —
TROUBLESHOOTING
Instrument status window not updating

Check serial cable connections.

If the status field in the Instrument View window indicates the CMRV is
idle, then give the command to initiate the desired operation.

If the temperature control lights on the Controller are lit or blinking,
close the Instrument Status window and reopen it.

If temperature control lights on the Controller are not lit or blinking,
you may have a Controller problem. Restart the instrument and try
again.
The CMRV is not heating properly

Check to make sure the thermistor is seated securely in the block.

Make sure CMRV PUMP and HEATER connections are correct and
secure.
The Yield/Viscosity lights on the CMRV Controller front panel are blinking rapidly.

Power down the Controller for at least four seconds and then switch
the Controller back on. If the lights continue to flash, there is an
internal problem with the Controller.
CMRV cooling/temperature control problems

Check to make sure the thermistor is seated securely in the CMRV
block.

Make sure all electrical connections are correct and secure.
Yield stress or viscosity test results inconsistent.

Check for damaged rotor tips or rotor pins and replace if necessary.

Make sure that the block thermometer reading is identical to tem-
perature probe indications on the CMRV computer screen. If there is
a significant difference, recalibrate the temperature probe and the
cells and run the sample again.

Check for condensation/crystallization of water vapor on rotors/cells
due to excessive humidity.

Check for inadequate cleaning of rotors/cells, especially with PAO
oils.
NOTE You must recalibrate all viscometric cells following a temperature probe
calibration to ensure accurate calibration constants for each cell.
Test icons "greyed out"--unable to initiate viscosity tests

The serial port may be locked. Wait for the previous test to time out
(about six minutes) and see if the icons become active again.