Brookfield DV1 Viscometer - Manual (Page 59)

Brookfield Engineering Laboratories, Inc. Page 59 Manual No. M14-023
Appendix J - Fault Diagnosis and Troubleshooting
Spindle Does Not Rotate
❏ Make sure the viscometer is plugged in.
❏ Check the voltage rating on your viscometer (115V, 220V): it must match wall voltage.
❏ Make sure the power switch is in the ON position.
❏ Verify rpm: make sure rotational speed (RPM) has been correctly selected.
Spindle Wobbles When Rotating or Looks Bent
❏ Make sure the spindle is tightened securely to the viscometer coupling.
❏
Check the straightness of all other spindles; replace them if bent.
❏ Inspect viscometer coupling and spindle coupling mating areas and threads for dirt: clean
threads on spindle coupling with a 3/56 left-hand tap.
❏ Inspect threads for wear; if the threads are worn, the unit needs service (see Appendix L).
❏ Check to see if spindles rotate eccentrically or wobble. There is an allowable run-out for
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 viscometer coupling is bent; if so, the unit is in need of service.
If you are continuing to experience problems with your viscometer, follow this troubleshooting section
to help isolate the potential problem.
Perform an Oscillation Check
❏
Remove the spindle and turn the motor OFF.
❏ Gently push up on the viscometer coupling.
❏
Turn the coupling until the % on the display reads 15% - 20%.
❏ Gently let go of the coupling.
❏
Watch the % values decrease and rest at 0.0 (±0.1%)
If the viscometer does not rest at zero, the unit is need of service. See Appendix L for details on how
to return your viscometer.
Inaccurate Readings
❏ Verify Spindle, Speed and Model selection
❏ Verify test parameters: temperature, container, volume, and method. Refer to:
• “More Solutions to Sticky Problems”; Chapter 3, Section 3.4, Viscosity Measurement
Techniques
❏ Perform a calibration check. Follow the instructions in Appendix F.
• Verify tolerances are calculated correctly.
• Verify that 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 how to return your viscometer.