Abstract: Process for the continuous analysis of the composition of gases, by means of a measuring head for determining the flow rate and analysis equipment which is placed a distance away from the measuring head and is connected thereto by a sample line, a calibration gas being fed to the sample line at the measuring head, by means of which the transit time of the gases is determined, and by means of this transit time a phase shift is introduced during the determination of the connection between the flow rate and the composition. According to the invention a series of calibration gas impulses are fed from the equipment, and the average transit time of the gases in the conditions prevailing locally at that moment is determined therewith, for the essentially continuous determination of the connection between the flow rate and the composition.

Abstract: Valve device intended for use in an apparatus for examining human metabolism processes through analysis of the breathing air, provided with a connection for a patient mouth-piece and a connection for the hose to the apparatus, an inhalation valve which opens as a result of inhalation and an exhalation valve which opens as a result of exhalation wherein the two connections are disposed in line with each other on a substantially cylindrical housing, and wherein the inhalation valve is formed by several valves in the cylinder wall of the housing distributed substantially along the entire periphery thereof. Preferably the valves are formed in a valve ring on the basis of a regular polygon which is made separately and which, in its entirety, is placed in the internal space of the housing.

Abstract: A flowmeter for gases has a rotor between two stators which consist of deflection blades, and an otpical system for detecting the rotation of the rotor and converting it into an electrical output signal. Each of the detector blades of the stators has a curved course between an inflow edge, where the blade from the hub to the periphery runs substantially in an axial plane, and an outflow edge, where the blade surface at each point thereof forms an angle with the axial direction which angle varies with the distance of each point from the hub.