The device has a measuring air line (12) for continuously releasing pressurized air from a compressed air supplying line (10), and sensors e.g. electrochemical sensors, infrared (IR) sensors and ceramic humidity sensors, for continuously detecting a parameter of pressurized air that is continuously supplied by the measuring air line. An air moisturizer (3) is arranged in a flow direction of the pressurized air before the sensors such that the moistened pressurized air acts on one of the sensors. The air moisturizer has a semi permeable water-permeable membrane. The sensors are designed as an air humidity detecting sensor (14), carbon dioxide detecting sensor (15), nitrogen dioxide detecting sensor (16), carbon monoxide detecting sensor (17), sulfur dioxide detecting sensor (18) and oxygen detecting sensor (19). The membrane is formed as nafion(RTM: sulfonated tetrafluoroethylene based fluoropolymer-copolymer). Independent claims are also included for the following: (1) a compressed air production system comprising an air compressor for compressing surrounding air to pressurized air (2) a method for producing pressurized air.
