Brookfield DV-III Ultra Rheometer - Manual (Page 128)

Brookfield Engineering Laboratories, Inc. Page 128 Manual No. M98-211-E0912
APPENDIX J - Fault Diagnosis and Troubleshooting
Listed are some of the more common problems that you may encounter while using your rheometer.
❑ Spindle Does Not Rotate
✓ Make sure the rheometer is plugged in.
✓ Check the voltage rating on your rheometer (115V or 220V); it must match the wall voltage.
✓ Make sure the motor is ON and the desired rpm is selected.
❑ Spindle Wobbles When Rotating Or Looks Bent
✓
Make sure the spindle is tightened securely to the rheometer coupling.
✓
Check the straightness of all other spindles; replace if bent.
✓
Inspect rheometer coupling and spindle coupling mating areas and threads for dirt; clean threads
on spindle coupling with a 3/56 left-hand tap.
✓
Inspect rheometer coupling threads for wear; if the threads are worn, the unit needs service (see
Appendix I). Check to see if spindles rotate eccentrically or wobble. There is an allowable
runout of 1/32-inch in each direction (1/16-inch total) when measured from the bottom of the
spindle rotating in air.
✓
Check to see if the rheometer coupling appears bent; if so, the unit is in need of service (see
Appendix L for details on returning your instrument for service).
If you continue to experience problems with your rheometer, follow this troubleshooting section to help
isolate potential problems.
❑ Inaccurate Reading
✓
Verify spindle, speed and model selection.
✓
If % readings are under-range (less than 10%), the units display (%, cP, D/cm 2 , 1/sec) will flash;
change spindle and/or speed.
✓ “EEEE” on the digital display means the unit is over-range (greater than 100%); reduce speed
and/or change spindle.
✓ Verify test parameters: temperature, container, volume, method. Refer to:
• “More Solutions to Sticky Problems”, Section III
• DV-III Ultra Digital Rheometer Operating Instructions, Appendix C, “Variables in Viscosity
Measurements.”
✓ Perform a calibration check; follow the instructions in Appendix E.
✓ Verify tolerances are calculated correctly.
✓
Verify the calibration check procedures were followed exactly.
If the unit is found to be out of tolerance, the unit may be in need of service. See Appendix L for details
on returning your instrument for service.