Levitation Air Adjustment; Figure 5-6. Location Of Rear Controls - Beckman Coulter Airfuge Instruction Manual

Maintenance

LEVITATION AIR ADJUSTMENT

* Flammability hazard. Do not use in or near operating ultracentrifuges.
5-8

Figure 5-6. Location of Rear Controls

If the rotor fails to stop completely or stops too fast, the levitation air
flow may require adjustment.
➠
NOTE
Refer to publication AF-TB-013 for levitation
air adjustment procedures on an instrument
equipped with a digital speed readout accessory.
1. Remove the stator pad and clean it with alcohol,* especially the
white circles on the bottom. Place it on the channel of the stator.
2. Turn the timer on, then back to zero. This will engage the braking
system and hold the brake pin down for 2 minutes while you
complete this adjustment.
3. Place a rotor on the stator pad. Be sure rotor caps or lids are
properly installed. (The rotor does not need to be loaded.)
4. Close the Airfuge door and turn the pressure regulator knob on
the door clockwise until the PRESSURE gauge indicates 30 psig
(207 kPa). The rotor will wobble.
5. Turn the LEVITATION AIR screw on the back panel (see
Figure 5-6) clockwise (decrease) until the rotor stops wobbling.
Then turn the screw slowly counterclockwise (increase) until the
rotor wobbles slightly. Note the position of the screw, then turn it