Portable electronic device for the analysis of a gaseous composition

A method for automatically analyzing a gaseous composition in an environment (A) at an environment pressure (Pa), by a portable analysis device, the method comprising the steps of:

• producing and keeping ionization pressure (Pi) conditions inside a sampling module of the device;
• adjusting an input gas flow (Fi) of gas particles from said environment (A) in the sampling module of the device, and adjusting an output gas flow (Fo) from the sampling module, in such a way that the input gas flow (Fi) is a flow at a molecular or predominantly molecular regime, at the environment pressure (Pa), and the output gas flow (Fo) is a flow at a molecular or predominantly molecular regime, at the ionization pressure (Pi), so that the gaseous composition in the sampling module is representative of the gaseous composition to be analyzed;
• ionizing the gas particles inside the sampling module, so as to obtain an ion composition representative of said gaseous composition to be analyzed;
• extracting the generated ions from the sampling module, to generate an ion flow (I) having an ion composition representative of said gaseous composition to be analyzed;
• controllably selecting, in a filtering module of the portable analysis device, in communication with the sampling module, at least one type of ion that is present in said ion flow (I), to generate a corresponding at least one homogeneous ion beam (I′), having an intensity representative of the concentration of the corresponding gas particle in the gaseous composition to be analyzed;
• extracting said at least one homogeneous ion beam (I′) from the filtering module;
• measuring the intensity of said at least one ion beam (I′), by an ion detecting module of the portable analysis device, to generate a corresponding electric signal (S) representative of the concentration of the corresponding gas particle in the gaseous composition to be analyzed.