Most large centrifuges are very old and as long as they are not abused, damaged, corroded and kept in good electrical condition they should last a very long time. I am not sure what "certified" safe means (in the USA, this is more of a liability/legal issue), but you could contact Beckman Coulter (or any other company which can provide service for this specific model) to have the unit fully check and serviced to confirm it is in good working order. *IMHO: If you are concerned about it, having a professional service company go over it (before you use it or invest money in it) would give you peace of mind.