PURPOSE: To perform the life control of a rotator automatically and secure the safety of work by providing a memory device which stores the life, etc. of the rotator and a discriminating device for preventing the rotator from being rotated beyond its permissible number of revolutions or life, etc. to a centrifigual machine.

CONSTITUTION: When the rotator 1 of a centrifugal machine is started of revolution by a motor 3, a detector 2 reads the coded numbers of the rotator 1. The codes having been read are sent as serial data to a discriminating device 5, where they are converted to parallel data and are sent to a central processing unit 12. The central processing unit 12 performs calculation, judgement, etc. according to the program having been charged beforehand in the memory device 11 and the life of the rotator has run out or when the permissible number of revolutions has exceeded the set value as a result of this, a command is given to a power control panel 9 which in turn stops the revolution. This increases the safety of the centrifugal machine, simplifies the life control of the rotator and improves operating characteristic.