a. Power Switch. The illuminated power switch on the left side of the console
applies power to the centrifuge. The switch remains lighted while in the ON position.
b. Run/Brake Switch. The run/brake switch on the right side of the console is
spring-loaded to remain in the RUN position. In this position, with the power switch on and
the timer set to the desired spinning time, the motor is actuated to begin the centrifuge
cycle. When you manually hold down the switch in the BRAKE position, the switch
actuates an electric brake which will bring the rotor to a gentle stop in less than 30
seconds. To actuate the brake, perform the following:
(1) Press and hold the switch down. The brake will be activated as long as
the switch is held down.
Release the switch as soon as the rotor comes to a stop.
For delicate sedimentations, release the switch just before the rotor comes to a
stop and let the rotor coast gently to a stop.
(3) DO NOT HOLD THE BRAKE SWITCH DOWN AFTER THE ROTOR HAS
STOPPED. If you hold it down too long, the rotor will automatically begin accelerating in
the opposite direction.
Unless the timer runs out or is turned to "0," the rotor will regain speed when the
switch is released.
c. Speed Control. A solid-state speed control provides smooth control over a
wide range of rpm. With the timer set, the power switch in the ON position, and the
centrifuge rotating at minimum speed, perform the following:
(1) Gradually turn the speed control knob clockwise from "0" until the desired
(2) At the end of the centrifugation cycle, return the speed control knob
counterclockwise to "0."
(3) You may select any speed from minimum ("0") to the maximum velocities
indicated in figure 1-2 for each of the fourteen rotor/shield configurations.
Before operating the centrifuge, the speed control should always be set at "0."
Depending on the rotor configuration and load, the centrifuge will rotate at less
than 500 rpm with the speed control set at "0."