Labnet Prism Air-Cooled Microcentrifuge (C2500) - Manual (Page 10)

To replace rotor, first make sure the motor shaft and rotor mounting hole are clean. Place
the rotor on the motor shaft. Reinstall the rotor securing screw on the motor shaft by
turning it clockwise. Hold the rotor with one hand and tighten the rotor securing
screw, using the rotor wrench.
3.4 Loading the rotor
Tubes to be loaded should be filled equally by eye. The difference in the weight between
the tubes should not exceed 0.1 gram. Tubes should always be loaded so that there is
equal spacing between all tubes. One or two additional loaded tubes may need to be
added to achieve this. Refer to Figure 1. to see one typical balancing scheme.
3.5 Overloading rotors
The maximum load of the rotor and maximum speed has been established by the
manufacturer. Do not attempt to exceed these values. The maximum speed of the rotor
has been established 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
red
) = x max speed (n
max
)
Example:
Where the density of the liquid is 1.7, the new maximum speed would be calculated as
follows:
n
red
= x 15,000 = 12,602 rpm
If in doubt concerning maximum speeds, please contact the manufacturer for assistance.