IMPROVED METER FOR A FLUID

Meter (10) for a fluid, for example a gas or a liquid, characterized in that it comprises: - a casing (11) configured to be crossed by the fluid to be measured, - an inlet mouth (15) and an outlet mouth (16) for the passage of a flow of said fluid, respectively entering inside the casing (11) and exiting the casing (11), - a detection module which is housed in said casing (11) and which is configured to detect one or more quantities relating to said fluid passing through said casing (11), - a processing section (20) which includes: - a first containment structure (22) which is external with respect to the casing (11), - a first electronic control and/or processing unit (21) which is housed inside the first containment structure (20) and which is electronically connected with said detection module, to thus receive and/or process signals representative of and/or or derived from the quantities detected by said detection module, - first optical communication means (25) which are mounted on and/or housed in said first containment structure (22) and which are electronically mounted on and/or connected with said first electronic unit (21), - a communication section (30) which includes: - a second containment structure (32) which is external with respect to the casing (11), - a communication module (33) for transmitting and/or receiving data via radio with the outside of the meter (10), - second optical communication means (35) which are mounted on and/or housed in said second containment structure (32), - a second electronic control and/or processing unit (31) which is housed in said second containment structure (32), said communication module (33) and said second optical communication means (35) being electronically mounted on and/or connected with said second electronic unit (31), and in which: - said first containment structure (22) and said second containment structure (32) are configured to be mechanically associated each other with in a removable manner and so that, when said structures are mechanically associated each other with, the first optical communication means (25 ) are capable of communicating with the second optical communication means (35), to thus define an optical communication interface (40) between the processing section (20) and the communication section (30) - said first containment structure (22) includes a receiving portion (27) and said second containment structure (32) includes an insertion portion (37), or vice versa, - said insertion