VWR International Compact Star CS4 Instruction Manual page 10

Rotor maintenance
The rotor should be cleaned thoroughly after each use. Thorough cleaning must be
performed when spinning samples containing phenol or phenol chloroform.
Periodically inspect the rotor for dents, dings, scratches, discoloration and cracks. If any
damage to the rotor is found, discontinue use of the rotor
immediately and replace.
Removing and Installing the angle rotor
Remove the rotor screw from the motor shaft by turning the screw counterclockwise. Lift
the rotor upward and remove from the centrifuge. Ensure that the motor shaft adapter
remains on the motor shaft (Figure 1). Clean the motor shaft and motor shaft adapter
(see figure 1). Place the rotor on the motor shaft (figure 1) and over the motor shaft
adapter (see figure 1 and 2). Note: Figure 1 and 2 are located on the following page.
When loading the rotor, refer to figure 3 (located on the following page). Loading in the
pattern indicated will ensure a balanced load. Tubes to be loaded should be filled equally
by eye. The difference in the weight between the tubes should not exceed 5 grams. A
partially loaded rotor may be centrifuged if the loading
scheme for balancing a rotor given in figure 3 is followed.
Overloading the rotor
The maximum load of the rotor and the maximum speed have been established by the
manufacturer. Do not attempt to exceed these values. The maximum speed of the rotor
has been measured for liquids having a homogeneous density of 1.2g/ml or less. In
order to centrifuge liquids with a higher density it is necessary to reduce the speed.
Failure to reduce the speed may result in damage to the rotor and centrifuge.
The revised maximum speed can be calculated with the following formula
Reduced speed (n ) x max speed
red
Example:
Where the density of the liquid is 1.7, the new maximum speed would be calculated as
follows:
= x 6,500 = 5,461 rpm
red
If in doubt concerning maximum speeds, please contact the manufacturer for assistance.