Method for making a detection device for detecting the position of a movable rod of a pneumatic actuator and detection device obtainable with that method

A method for making a detection device (2) for detecting a position of a movable rod (4) of a pneumatic actuator (1), comprising the operating steps of:

• taking a first body (17) comprising a connecting portion (19), a supporting portion (20) connected to the connecting portion (19), an electrical connector (21) associated with the connecting portion (19) and which in use allows electrical connection of the detection device (2) to a control unit, a magnetic field detection sensor (15) positioned on the supporting portion (20) and electrical connecting means (22) for electrically connecting the electrical connector (21) to the detection sensor (15);
• taking a second body (18) comprising a housing (14) in which the supporting portion (20) can be inserted;
• inserting the supporting portion (20) and the detection sensor (15) positioned on the supporting portion (20) into the housing (14);
• irremovably constraining the first body (17) to the second body (18);
• wherein the first body (17) and the second body (18) comprise, one at least one projecting element (25) and the other at least one corresponding hole (26) in which the projecting element (25) can be inserted,
• wherein during the insertion step the projecting element (25) is inserted in the hole (26), and
• wherein during the constraining step the first body (17) is irremovably constrained to the second body (18) by plastically deforming the projecting element (25) to prevent the projecting element (25) from being extracted from the hole (26) in which the projecting element (25) is inserted.