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: 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.