Beckman Couler ALLEGRA X-12/R, Service Manual, Page: 26 / 83

Section 1: Introduction
CENTRIFUGE CHASSIS
HOUSING
The centrifuge housing is made of sheet steel and structural foam and is finished with acrylic
baking enamel paint. The control panel overlay is made of coated polystyrene copolymer. The
right and left side front panels are made of high-impact polystyrene structural foam coated with
enamel.
DOOR
The aluminum and structural foam door is secured to the housing by solid hinges. A window in
the center allows strobe viewing. When the door is closed, the locking system engages. The door
is locked when a run is in progress and can be opened only when the rotor is stopped and the
LED next to the [Door] key is lit. If there is a power failure, the door lock can be manually
tripped for sample recovery (see Section 4, Troubleshooting).
ROTOR CHAMBER
The aluminum rotor chamber is coated with a chemical resistant epoxy finish. The chamber is
sealed by a labyrinth of four rubber gaskets.
TEMPERATURE SENSING AND CONTROL
With the power on, the temperature control system is activated when the door is closed and
locked. A sensor in the rotor chamber continuously monitors chamber temperature. The
microprocessor calculates the required chamber temperature to maintain the selected rotor
temperature. Run temperature in the Allegra X-12R, X-15R can be set between –10 and +40°C.
Temperature in the Allegra X-12 is factory set at 20°C, and is maintained at between 18 and 22°C
to prevent sample heating..
NOTE To avoid chamber icing, refrigeration is off when the door is open.
The centrifuge door must be closed and locked for the
refrigeration system to
begin operating.
DRIVE
The asynchronous direct-drive motor is brushless for clean, quiet operation. The resilient
suspension ensures that loads will not be disturbed by vibration, and prevents damage to the drive
shaft if an imbalance occurs during centrifugation. Maximum acceleration and deceleration may
be selected to allow fast processing of samples; alternately, delicate gradients may be preserved
using slower acceleration and deceleration.
SAFETY FEATURES
Saftey features include the following:
PROTECTIVE RING
A structural steel ring surrounding the rotor chamber provides full operator protection.
1-6 Allegra X-12/R, X-15R Service Manual 07/04