Choosing a Laboratory Centrifuge
Select a centrifuge according to the sample type, required centrifugal force, tube size and number of samples processed per run. Consider rotor compatibility, speed control, timer settings and available bench space. Match the instrument to your procedure rather than selecting on maximum speed alone.
RPM and Relative Centrifugal Force
Rotational speed is expressed in revolutions per minute (RPM), while relative centrifugal force (RCF or × g) describes the force applied to the sample. RCF depends on both speed and rotor radius, so the same RPM can produce different forces in different rotors. Use the RCF specified by your protocol and the correct conversion for the selected rotor.
Clinical Centrifuges and Microcentrifuges
Clinical centrifuges accommodate compatible sample tubes for routine separation procedures. Microcentrifuges handle smaller-volume tubes for sample preparation, pelleting and quick spin-down tasks. Confirm the required tube dimensions, working volume and rotor configuration before ordering.
Rotors, Adapters and Tube Compatibility
Check the supported tube sizes and rotor capacity for each model. Some tube formats require adapters or a specific rotor, and these may be included or sold separately. Tubes, caps, adapters and rotors must all be rated for the intended centrifugal force and compatible with the sample.
Speed, Timing and Workflow
Variable speed and timer controls help match centrifugation conditions to a defined procedure. For quick spin-down tasks, check whether the model provides a short-spin function. Compare acceleration, braking and control options where these affect sample handling or repeatability.
Temperature Requirements
Determine whether your samples require temperature-controlled centrifugation. An ambient-temperature centrifuge does not provide active refrigeration, and samples may warm during operation. Confirm the model’s temperature capabilities against the requirements of your protocol.
Balancing and Routine Care
Balance loads by mass and arrange tubes symmetrically according to the rotor instructions. Inspect tubes, rotors and adapters for wear or damage before use, keep the chamber clean and follow the manufacturer’s maintenance guidance. Allow the rotor to stop completely before opening the lid.
