System for automatically balancing a centrifuge in operation

A system for automatically balancing a centrifuge in operation, the centrigue including a rotary arm including at least one horizontal tube mounted on a turret for rotation about a vertical axis relative to a stand, the balancing system comprising a system for selectively displacing a mass of fluid inside said hollow horizontal tube, and a circuit for measuring any unbalance of the rotary arm which may be out-of-balance, and the circuit for measuring the unbalance comprising sensors disposed on the centrifuge, four strain-gauge bridges disposed on elastically deformable parts incorporated in the stand or in the connections between the stand and its foundation, with the four strain gauges lying in a horizontal plane at equal distances from the vertical axis of rotation of the rotary arm and being diametrically opposed in pairs along two mutually orthogonal directions, circuits for processing the signals delivered by the sensors in order to deliver alarm signals or rebalancing controlsignals in the event of unbalance being detected, and control means for controlling said system for selectively displacing a mass of fluid, said control means responding to rebalancing control signals delivered by the unbalnce measuring circuit in order to give rise to selective real time displacement inside said hollow horizontal tube of a mass of fluid for dynamically rebalancing the rotating arm of the centrifuge.