Brookfield DV3T Rheometer - Manual (Page 120)

Brookfield Engineering Labs., Inc. Page 120 Manual No. M13-2100
Appendix J - Fault Diagnosis and Troubleshooting
Listed are some of the more common problems that you may encounter while using your Rheometer.
❏ Spindle Does Not Rotate
✓
Make sure the rheometer is plugged in.
✓
Check the voltage rating on your rheometer (115, 220V); it must match the wall voltage.
✓
Make sure the motor is ON and the desired rpm is selected.
❏ Spindle Wobbles When Rotating or Looks Bent
✓
Make sure the spindle is tightened securely to the rheometer coupling.
✓
Check the straightness of all other spindles; replace if bent.
✓
Inspect rheometer 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 M). Check
to see if spindles rotate eccentrically or wobble. There is an allowable runout of 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 rheometer coupling appears bent; if so, the unit is in need of service (see
Appendix M: Warranty Repair and Service).
❏ Inaccurate Readings
✓ Verify spindle, speed and model selection.
✓
Verify spindle selection is correct on DV3T.
✓ If % readings are under-range (less than 10%), the display 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
• “DV3T 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 M
for details on Warranty Repair and Service.