Gas sensor system

A gas sensor system, comprising:

• a first pipe through which a specimen atmosphere is conveyed;
• a source of reference air is connected a fourth pipe through which the reference air is conveyed,
• a switching device connected to the first pipe and the fourth pipe and configured to switch between a reference phase in which the first pipe is cut off and the fourth pipe and an inlet to a mixing device are connected, and a detection phase in which the fourth pipe and the inlet to the mixing device are cut off and the first pipe and the mixing device are connected;
• a humidifying device connected to a second pipe through which humidified air from the humidifying device is conveyed to a mixing device, the humidified air being hotter and more humid than the specimen atmosphere, the humidified air having a lower water vapor pressure than a saturation water vapor pressure;
• the mixing device is connected the switching device and humidifying device, the mixing device is configured to mix the specimen atmosphere and the humidified air so that a water vapor pressure of mixed air of the specimen atmosphere and the humidified air is less than a saturation water vapor pressure;
• the mixed air being conveyed through the mixing device outlet via a third pipe;
• a cooling device connected to the mixing device via the third pipe and configured to cooling the mixed air conveyed through the third pipe so that the water vapor pressure of the mixed air becomes the saturation water vapor pressure;
• a chemical sensor device connected with the third pipe, the chemical sensor device including a sensor surface to which the mixed air cooled by the cooling device is supplied;
• and
• a control device configured to switch between the reference phase in which the first pipe and the mixing device are cut off and the fourth pipe and the mixing device are connected, and a detection phase in which the fourth pipe and the mixing device are cut off and the first pipe and the mixing device are connected.