Housing And Door; Rotor Chamber; Friction Reduction System (Frs); Drive - Beckman Coulter Avanti JXN-26 User Manual

Housing and Door

The instrument control housing, door assembly, and cover panels are made from a highly-durable
plastic.
The door is opened by stepping on a foot pedal, which is located at the bottom right front of the
instrument. The door is hinged at the back left to open at a 60-degree angle to the centrifuge side
panels, providing clearance for loading and unloading of the centrifuge.
In the event of a power failure, the door can be manually unlocked for sample recovery (see
Accessing the Rotor in Case of Power Failure

Rotor Chamber

The rotor chamber is made of stainless steel to resist corrosion. A rubber gasket around the
chamber opening ensures sealing.
NOTE
Instrument gaskets have not been qualified as bioseals for aerosol containment.

Friction Reduction System (FRS)

The friction reduction system (FRS) uses a mechanical rotary vane vacuum pump to reduce
chamber pressure. The pump turns on after the run is started, before rotor friction reaches a high
level. When the required vacuum level is reached, the pump turns off. Vacuum in the chamber is
vented during rotor deceleration.

Drive

The drive spindle is directly driven by a brushless, high-torque, switched-reluctance motor. The
instrument's resilient suspension minimizes disturbance of the sample during acceleration and
deceleration, and reduces damage to the drive spindle if an imbalance occurs during centrifugation.

Temperature Sensing and Control

The temperature control system is cooled by circulation of a non-CFC-based refrigerant. A
thermistor in the rotor chamber continuously monitors the chamber temperature. The system
calculates the chamber temperature required to maintain the set temperature. Although the
chamber temperature fluctuates during operation, the rotor's large mass keeps the sample
temperature substantially constant. At the end of a run, the system continues controlling the
temperature to prevent freezing or overheating of the sample.
PN B38322AA
in CHAPTER 7, Maintenance and
1
Description
Housing and Door
Troubleshooting).
1-3