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6. TROUBLE SHOOTING
Locate malfunctions and take corrective actions referring to Table 5 and Table 6
Table 5 Troubleshooting
Symptom
Details of checking
Corrective action
Vibrations are abnormally
great when centering the
bearing housing.
1. Assembled state of bearing
housing.
2. Shaft (D) is bent.
1. Bring the bottom of bearing
housing into close contact with
the contact surface of door
adapter.
2. Replace shaft (D).
Pressure is 1.5- kgf/cm or
higher when density gradient
solution is injected.
1. The injection flow rate is too
high.
2. The rotor has been filled
with solution.
3. The injection passage is
blocked.
1. The appropriate flow rate is
approx. 50 ml/min.
2. If filled up, it can be released
in the subsequent stage.
3. Disassemble and check.
(Blocking is likely to occur in
the seal body assembly.)
Too much drainage
1. Transparent oil drains.
2. White solution (sample)
drains.
1. The gap between shaft (D)
and the bearing becomes too
great and too much oil is
components.
2. Leaked from sealed surface.
See Table 6.
Bubbles enter the sample line.
1. The pressure rises.
2. The sample stops flowing.
1. If the pressure does not rise so
much, it is possible to continue
operation.
2. If the pressure is too high or
the sample stops flowing, slow
down the rotor and remove
bubbles.
Pressure drops abruptly
during separation.
1. Too much white solution
drains.
2. The sample injection line is
bypassed.
1.
See Table 6.
2.
Temperature of the rotor rises.
1. Poor degree of vacuum.
1. Investigate the cause of poor
degree of vacuum and take
corrective action.
2. It is necessary to precool the
rotor body and cool the sample
to separate at low
temperatures.
(See item 4.2)