Power Switch; Safety Device - Hitachi CR22N Instruction Manual

1-2-2 POWER Switch

The POWER switch applies electric power to the centrifuge.
「｜」：ON
「○」：OFF

1-2-3 Safety Device

(1) Protector of rotor chamber
The rotor chamber allows the rotor to rotate at high speed. To prevent any rotor mishap
during centrifugation, a steel protector is provided around the chamber for operator safety.
(2) Imbalance detector
This centrifuge is equipped with a sensor that detects severe vibration of the rotor due to
improper bucket setting or excessive imbalance, and decelerates the rotor when detecting it.
(3) Door lock
For the sake of safety, the door is automatically locked while the rotor is rotating. The locked
state is held even if the instrument power is turned off. The door can be opened/closed only
when the rotor stops.
(4) Dual-overspeed detector
This centrifuge is equipped with a sensor that does not allow the rotor to rotate over the
allowable maximum speed.
1.If improper speed over the allowable maximum speed is set, the overspeed detector detects
it when the rotor is running at low speed (300 rpm) and displays an alarm message
"SPEED".
2.Even if the improper operation exceeding over the allowable maximum speed is occurred,
the centrifuge is equipped with the CPU that detects over-speed . Then it stops the rotor for
operator safety.
(5) Rotor cover detector
Operation without the rotor cover can cause disengagement of rotor due to buoyant force.
This centrifuge is equipped with a sensor that detects absence of the rotor cover and
decelerates the rotor for operator safety.
POWER switch
1-5
1-2-2 POWER Switch
1-2-3 Safety Device
Fig. 1-2-2 POWER Switch