Abstract: A fluidic sensor of objects comprising a body in which there are mounted an emitting nozzle connected to a feeding chamber connected to a feeding conduit, and an intake nozzle disposed in the area defined by the emitting nozzle and connected to an outlet conduit. Between the inlet conduit and the feeding chamber there is, shaped in the body, an additional chamber inside which there is a movable valve body with conical seats shaped on opposite ends, which is connected to a switching sensor movably mounted in the body. The switching sensor disconnects the flow of feeding energy when the object is outside a zone of detection and causes an acoustic signal if the object moves too close to the fluidic sensor. The acoustic signal can be used to cause a breakdown step.