The lubrication units belonging to ZX series are complete systems to produce the air-oil mixture, obtained dosing small amonut of oil in a continuous flow of air. The unit is controlled by a PLC which adjust the quantity of lubricant delivered; the delivery of the air-oil mixture is monitored by optical sensors to the outlets of the mixer. The controlling elements communicate with PLC programmable unit, which is linked to the central unit of the machine the unit is mounted on. The unit can be assembled inside a metallic box, and has got filters both on the air line and on the oil line.