Brookfield DV-E Viscometer - Manual (Page 34)

Brookfield Engineering Labs., Inc. Page 34 Manual No. M98-350-J0912
Appendix G - Fault Diagnosis and Troubeshooting
Listed below are some of the more common problems that you may encounter while using your
DV-E Viscometer. Review these items before you contact Brookfield.
Spindle Does Not Rotate
o Make sure the viscometer is plugged in.
o Check the voltage rating on your viscometer (115V, 220V): it must match the wall voltage.
o Make sure the power switch is in the ON position.
o Make sure the speed set knob is set properly and securely at the desired speed.
Spindle Wobbles When Rotating or Looks Bent
o Make sure the spindle is tightened securely to the viscometer coupling.
o Check the straightness of all other spindles; replace them if bent.
o Inspect viscometer coupling and spindle coupling mating areas and threads for dirt: clean
threads on spindle coupling with a 3/56 left-hand tap.
o Inspect threads for wear; if the threads are worn, the unit needs service (see Appendix I).
o Check to see if spindles rotate eccentrically or wobble. There is an allowable runout for 1/32-
inch in each direction (1/16-inch total) when measured from the bottom of the spindle rotating
in air.
o Check to see if the viscometer coupling is bent; if so, the unit is in need of service.
If the pointer sticks and/or does not rest at zero, the unit is in need of service. See Appendix I for
details on how to return your viscometer.
Inaccurate Readings
o Verify spindle, speed and model selection
o Verify test parameters: temperature, container, volume, method. Refer to:
• “More Solutions to Sticky Problems”; Section II.2a — Considerations for Making
Measurements
• Dial Viscometer Operating Manual; Appendix A — Viscosity Ranges
• Dial Viscometer Operating Manual; Appendix B — Variables in Viscosity Measurement
o Perform a calibration check. Follow the instructions in Appendix D.
• Verify tolerances are calculated correctly.
• Verify 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 I).