Method and device for identifying gaseous compounds

Method for determining gaseous compounds,

• wherein a sample gas stream is lead to a sensor array (1) with several gas sensors (2), wherein the electrical output signal of the individual gas sensors (2) are captured by the evaluation computer (20), wherein the electrical output signals are converted into a characterizing image, are stored and are compared with the characterizing images of other gas mixtures,
• characterized in that the sample gas stream is thinned with a stream of air prior to the feeding into the sensor array (1) and wherein thereby the concentration of the sample gas stream kept constant to a predetermined value below the saturation concentration,
• wherein the sample gas stream contains easily volatile gas components and wherein the sample gas stream is separated and is freed of easily volatile gas components prior to the feeding into the sensor array (1) and prior to the mixing with the air stream.

Apparatus for determining a gaseous compound, comprising a sensor array (1) with several gas sensors (2) and a transfer and control unit (16) for the controlled transport of a sample gas stream through the sensor array (1) as well as a bypass connected evaluation computer (20) for capturing all signals of the sensor array (1) and for converting the signals into a characterizing image of the sample gas stream and for storing this characterizing image, characterized in that a switchable three way valve (6) is disposed in a feed line (3) with an inlet port (4) of the sensor array (1), wherein the switchable three way valve (6) is in connection with a selective collection unit (7) and wherein a sideline (12) with a thinning unit (13) joins between the three way valve (6) and the sensor array (1).

Method for determining gaseous compounds, wherein a sample gas stream is lead to a sensor array (1) with several gas sensors (2), wherein the electrical output signals of the individual gas sensors (2) are captured by the evaluation computer (20), wherein the electrical output signals are converted into a characterizing image, are stored and are compared with the characterizing images of other gas mixtures, characterized in that the sample gas stream possibly contains easily volatile gas components, wherein the sample gas stream is separated and freed of easily volatile gas components and in the following is thinned with a stream of air prior to the feeding into the sensor array (1) and wherein thereby the concentration of the sample gas stream is kept constant to a predetermined value below the saturation concentration for obtaining a comparable characterizing image.

Apparatus for determining of gaseous compound, comprising a sensor array (1) with the several gas sensors (2) and the transfer and control unit (16) for the controlled transport of a sample gas stream through the sensor array (1) as well as a bypass connected evaluation computer (20) for capturing all signals of the sensor array (1) and for converting the signals into a characterizing image of the sample gas stream and for storing this characterizing image,

• characterized in that a switchable three-way valve (6) is disposed in a feed line (3) with an inlet port (4) of the sensor array (1), wherein the switchable three-way valve (6) is in connection with a selective collection unit (7) for separating and freeing of easily volatile gas components and wherein a sideline (12) with a thinning unit (13) joins between the three way valve (6) and the sensor array (1) for maintaining the concentration of the sample gas stream constant at a predetermined value below the saturation concentration.