Brookfield DV-II+ Programmable Viscometer - Manual (Page 69)

Brookfield Engineering Labs., Inc. Page 69 Manual No. M/97-164-F1 102
❏ Inaccurate Readings
✓ Verify spindle, speed and model selection.
✓ If % readings are under-range (less than 10%), the display will flash; change spindle and/or
speed.
✓ “
EEE ” 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-II+ Programmable Viscometer 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 K for
details on “How to Return Your Viscometer”.
❏ Viscometer Will Not Return to Zero
✓ Viscometer is not level
• Check with spindle out of the sample
• Adjust the laboratory stand
✓ Pivot point or jewel bearing faulty
• Perform calibration check
• Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair
❏ Display Reading Will Not Stabilize
✓ Special characteristic of sample fluid. There is no problem with the viscometer.
• Refer to Appendix C
✓ Check for erratic spindle rotation.
• Verify power supply
• Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair
✓ Bent spindle or spindle coupling.
• Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair
✓ Temperature fluctuation in sample fluid
• Use temperature bath control.