The CAM MT32 is a spray can valve check up system based on an intensity-length of time control consisting of work chambers connected to the suction system and a piezo ceramic plate sensor with suitable clad in refractory material against chemical agents. The piezo ceramic device is placed in front of the product flow which generates an electrical signal. The technical advantages of an MT32 are that it is a possibility to discriminate the correct opening & correct closure of the canister valve checking the flow during. The sensor is a self cleaning type. Due to capabilities of the self cleaning sensor and the suction system, it is possible to program through the operator panel some cleaning cycles preventing any physical contact between the operator & product.