Reducing Speed For Loads In Excess Of Design Mass - Thermo Scientific SORVALL RC-5C PLUS User Manual

Operation
W A R N I N G
!
Failure to reduce rotor
speed when compartment load ex-
ceeds maximum allowable compart-
ment load can lead to rotor failure.
4-8
3. Set a run speed of 2000 rpm.
4. Set the TIMED/HOLD switch to HOLD.
5. Set the RUN temperature switch for desired run temperature.
6. Set the MAX temperature switch for a value higher than the
temperature displayed to avoid an overtemperature condition.
7. Set all other controls as you would for a normal mode run.
8. Press the START switch. The rotor will accelerate to 2000 rpm
and quickly cool to the selected run temperature. It will typically
take the rotor 30 minutes to cool, but the actual time will vary
depending on the rotor weight and rotor material. When the
displayed temperature equals the run temperature setting, stop
the run.
9. After the rotor has come to a stop, open the chamber door and
remove the rotor lid. Place the samples in the rotor and balance
the load as specified in the rotor instruction manual.
10. Re-secure the rotor lid. Lock the rotor to the drive spindle. Close
the chamber door.
11. Perform the desired centrifuge run.
Reducing Speed for Loads in
Excess of Design Mass
There is a maximum allowable compartment mass established for
each rotor (see the Rotor Information Table in the Appendix or the
individual rotor manual). To prevent rotor failure, the total contents
of any compartment, including specimen, tubes, sealing assembly,
and adapters (if used), must not exceed the specified maximum
compartment mass unless rotor speed is reduced proportionately.
Strict adherence to the maximum allowable compartment mass or
reduced rotor speed is required to prevent rotor failure. Read the
WARNING. If the maximum compartment mass is greater than
the value specified for the rotor, use the following formula to
determine the reduced rotor speed that is required:
Reduced Speed = Maximum Rotor Speed x
SORVALL
√
Maximum Compartment Mass
Actual Compartment Mass
®
Centrifuges