Abstract: A portable pneumotachograph for determining components in an exhalation volume. The problem of extreme sensitivity of sensors to the temperature and moisture content of the gases, and cross-sensitivities to other potential components of the exhalation gas, is solved by providing a climate control chamber wherein a defined gas atmosphere can be set such that by means of the climate control chamber the relative humidity and/or the temperature and/or the composition of a sample and/or calibration gas can be set to predefined parameters.

Abstract: A portable pneumotachograph for determining components of the expiration volume, comprising a processor (3), a PEEP valve (4) mounted on the pneumotachograph (1) on the exhaling side, a filter (5) mounted on the pneumotachograph (1) on the inhaling side for removing the portion of the component in the inspiration air to be determined, at least one sensor (7) mounted in or on the pneumotachograph tube (6), wherein in the sensor (7) disposed on the pneumotachograph tube (6), the pneumotachograph tube (6) having an opening (8) on the sensor side, and/or at least one means configured in the pneumotachograph tube (6) for sampling, and further an optical and/or acoustic control device (9) for the expiration flow. This enables a correlation of measurement data of one or more components of the exhaled flow detected with a lung function test, enabling the localization of the seat of the disease.