Used Centrifuge: What to Check Before You Buy

In a used centrifuge the most important part is the rotor: it must match the model, be in good condition without corrosion or cracks, and fit your tubes. Then check maximum speed and RCF, cooling if you need it, the lid lock, the imbalance sensor, and support and spare parts for the model.

The rotor

Is the rotor included and approved for the model
Corrosion, cracks or deep scratches, especially at the bottom of the bores
Adapters and buckets for the tubes you use
A cycle log or manufacturing date, if available

Performance

Check the maximum speed (RPM), the relative centrifugal force (RCF, in g) the rotor allows, and the capacity. RCF is what determines the result, so compare by RCF and not only RPM.

Cooling and safety

Refrigerated models: does it reach and hold temperature
A lid lock that stays closed while spinning
An imbalance sensor that stops the run
Noise, vibration or a burning smell during operation

Frequently asked questions

What is the difference between RPM and RCF?

RPM is revolutions per minute. RCF is the actual force on the sample and also depends on the rotor radius. Protocols usually specify RCF.

Can I use a rotor from another model?

Only a rotor the manufacturer approves for that model. An unapproved rotor is dangerous.