Abstract: A device for the survey of the breathing ventilation and oxygen consumption has a mask M, worn by the person being examined, a control modulus that realizes a sample method of the breathing volume and of the turnover management, and a radio transmitter 25 that sends the signals to a fixed reception and elaboration unity UF. The device is portable due to the very small dimensions thereof, and very light due to the presence of a slow analyzer that has the advantages of the quick analyzers, by means of controlled turnover sampling that makes the micro mixing chamber 3 at fixed capacity equivalent to a dynamic chamber at variable capacity. At the end of each breathing action, when the air flow is annulled, the impulses due to the moment of inertia of the turbine 7 are suppressed by means of the pressure transducer 9 that identifies the annulment of the flow and corrects the signal still provided by turbine 7.

Abstract: A device for the sampling and measuring of the concentrations of the gases expired by a person, comprising a "mediator" whose functioning may be overlapped, for what concerns the results, to the one that could be obtained by varying the capacity of a dynamic chamber, being (K)-times bigger, where (K=F/Fc), with (F) being the flow of the gas to be analyzed and (Fc) being the sampling flow. The sampling pump (4) is always in phase with the ventilation signal, and the capacity is always directly proportional to said ventilation according to a factor determined by amplifier (6) at variable gain and by power amplifier (5). When the ventilation signal increases, an integrator circuit (7) controls the gain of stage (6). This allows to vary the proportionality factor between ventilation and sampling flow of the pump. In this way the air volume passing through the mixing chamber (2) will be practically constant, and a functioning will be obtained being equivalent to the one of a dynamic chamber.