Transmitter for sensing a physical variable relative to a process fluid of an industrial plant, characterized in that it comprises at least a hollow main body for housing a sensor, and a body for direct or indirect interface with a process fluid of which a physical variable requires to be sensed, said interface body being connected to the main body and having an integral structure shaped so that it has at least one internal housing for receiving a separator body and at least one end flange suitable to be operatively coupled, at an external surface thereof, to a fluid container, said external surface being positioned at a distance from and in communication with said internal housing by means of a connection channel.