METHOD FOR ANALYSIS OF MULTICOMPONENT GAS MEDIA AND DEVICE FOR ITS USE

摘要

FIELD: gas industry. ;SUBSTANCE: invention relates to a means for the analysis of multicomponent gaseous media containing various gases and volatile organic compounds and can be used, for example, to analyze the air exhaled by a person in order to diagnose diseases or to analyze the air of residential and industrial premises. Disclosed is a method for analyzing multicomponent gaseous media according to which the gas chamber is cleaned by pumping zero gas through a pneumatic line to recirculate the sample. The analyzed medium is fed into the gas chamber using a device for forced injection of the sample hermetically connected to the inlet of the gas chamber after which the resistance of all gas sensors is continuously measured first at the initial temperature. Then the temperatures of the semiconductor gas sensors are changed stepwise. The steady-state values ​​of the resistance of each semiconductor gas sensor are measured and recorded at each of these temperature values, the parameters of humidity, ambient temperature and oxygen concentration are also measured and recorded using appropriate sensors, and the analysis of the presence and concentration of gaseous substances in the medium under study is performed by mathematical processing of the measured values of electrical resistance of gas sensors at different temperatures taking into account humidity, ambient temperature and oxygen concentration. The device for using this method includes a gas chamber with semiconductor gas sensors installed in it, humidity and temperature sensors, a gas supply system with a gas flow rate stimulator, an electronic unit for continuous measurement of sensor resistances, their temperatures and electrical signals from humidity and temperature sensors, an electronic unit for setting the temperatures of semiconductor gas sensors. The device is additionally equipped with an oxygen sensor the output of which is connected to the input of the electronic unit for continuous measurement of the resistance of the sensors, and the gas supply system is additionally equipped with a forced sample injection device installed in the gas chamber inlet as well as a pneumatic line for recirculation of the sample through a gas tee piece pneumatically connected to a gas flow rate booster and a mechanical drain valve. ;EFFECT: increasing sensitivity and selectivity to a wide range of gases, improving reproducibility of results, reducing measurement time, reducing volume of the gas sample required for analysis.;13 cl, 3 dwg, 1 tbl