
1-2
Description
Figure 1-1. The Allegra 25R Centrifuge
SAFETY FEATURES
The centrifuge has been designed and tested to operate safely indoors
at altitudes up to 2 000 m (6 562 ft). Safety features include the
following.
• An electromechanical door lock system prevents operator contact
with spinning rotors and prevents run initiation unless the door is
shut and locked. The door is locked when a run is in progress and
can be opened only when the rotor is stopped and the LED (light-
emitting diode) on the [
OPEN DOOR
] key is lit.
• An imbalance detector monitors the rotor during the run, causing
automatic shutdown if rotor loads are severely out of balance. At
low speeds, an incorrectly loaded rotor can cause imbalance. Rotor
instability can also occur if the centrifuge is moved while running,
or if it is not resting on a level and secure surface.
• To prevent overspeed the microprocessor checks the rotor identifi-
cation during start-up and stops the run if the rotor is incorrectly
identified.
IMBALANCE
ENTER
PULSE
ACCEL
DECEL
TEMP
RPM
RCF
ROTOR
TIME
STOP
START
FAST
STOP
OPEN
DOOR
SPEED
TIME
TEMP°C
ACC/DEC