Brookfield DV3T Rheometer - Manual (Page 121)

Brookfield Engineering Labs., Inc. Page 121 Manual No. M13-2100
❏ Rheometer Will Not Return to Zero
✓ Rheometer is not level
• Check with spindle out of the sample.
• Adjust the laboratory stand.
✓ Pivot point or jewel bearing faulty
• Perform an Oscillation Check*
✓ Remove the spindle and turn the motor OFF; select display to % torque mode.
✓
Gently push up on the rheometer coupling.
✓
Turn the coupling until the digital display reads 10-15 on the % display.
✓ Gently let go of the coupling.
✓
Watch the digital display; you should see a “run” of numbers next to the %; the “run” of
numbers should ultimately stop at 0.0 (+/- 0.1).
If the digital display does not return to ZERO, the unit most likely is in need of service.
• Perform calibration check (see Appendix E).
• Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair (see
Appendix M).
* This procedure does not apply to instruments with ball bearing suspension (see Section I.3).
❏ 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 for control.