The fraction collector, GE Healthcare / Amersham Pharmacia RediFrac, is a versatile instrument for simple, straightforward fraction collection.   
   
Fractions may be collected in different ways, based either on time or drop counting, controlled via simple programs specified by the operator. For example, the operator can choose to collect uniform fractions of a fixed time period. The RediFrac will collect fractions until all the tubes are used and then switch itself off. Alternatively, fractions may be collected by specifying the number of drops per tube. Safe collection is ensured by using drop synchronization combined with the unique tube sensor which means the instrument cannot collect into empty positions in the tube rack.