Brookfield DV-III Rheometer - Manual (Page 78)

Brookfield Engineering Laboratories, Inc. Page 78 Manual No. M/98-211-A0701
❏ Viscometer Will Not Return to Zero
✓ Rheometer is not level
• Adjust the laboratory stand
✓ Pivot point or jewel bearing faulty
• Perform calibration check
• Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair.
❏ Inaccurate Readings
✓ 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+ 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 I for
details on “How to Return Your Rheometer.”
❏ Display Reading Will Not Stabilize
✓ Special characteristic of sample fluid. There is no problem with the rheometer.
• 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.