NOVELTY - Obtaining nitrogen from air, comprises (a) supplying air on one side of a fuel cell (2); (b) supplying hydrogen on the other side of the fuel cell; (c) reacting the atmospheric oxygen in the fuel cell with the hydrogen to form water; (d) detecting an electric current, which flows with respect to reacting water between the sides of the fuel cell; (e) reacting to water and discharging the air; (f) passing integral current during reaction to water and after supplying the air between the sides of the fuel cell; and (g) passing the current that reaches or falls below a predetermined threshold.    USE - The method is useful for obtaining nitrogen from air (claimed).    ADVANTAGE - The method provides improved and/or simplified quality control for producing nitrogen from air.    DETAILED DESCRIPTION - Obtaining nitrogen from air, comprises (a) supplying air on one side of a fuel cell (2); (b) supplying hydrogen on the other side of the fuel cell; (c) reacting the atmospheric oxygen in the fuel cell with the hydrogen to form water; (d) detecting an electric current, which flows with respect to reacting water between the sides of the fuel cell; (e) reacting to water and discharging the air; (f) passing integral current during reaction to water and after supplying the air between the sides of the fuel cell, in which a predetermined limit is reached or exceeded and the limit value is determined by a minimum value for the reacted oxygen from the air; and (g) passing the current that reaches or falls below a predetermined threshold, in which the limit value is predetermined by a maximum value for the hydrogen present in the air relative to the oxygen in the fuel cell. An INDEPENDENT CLAIM is also included for a device for obtaining nitrogen from air comprising fuel cell, a first input terminal (4) for supplying air, a second input terminal (6) for supplying hydrogen, a first sensor (16) for detecting the electric current, in which the device discharges air from the fuel cell.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of the device.    Fuel cell (2)    First input terminal (4)    Second input terminal (6)    First sensor (16)    Valve (24)