| 摘要 |
A sampling system for and a method of separating a volume from a flow of a gaseous sample, the sampling system comprising: a first flow channel; a second flow channel intersecting the first flow channel; a first port in the first flow channel on one side of the point of intersection of the first and second flow channels through which a flow of a gaseous sample is in use delivered; a second port in the second flow channel on one side of the point of intersection of the first and second flow channels through which a flow of a carrier gas is in use delivered; a third port in one of the first and second flow channels on the other side of the point of intersection of the first and second flow channels through which a volume, as a sample plug, separated from the gaseous sample flow is in use driven; a fourth port in the other of the first and second flow channels to which a principal flow of the gaseous sample is in use directed; and a control unit to control the flow of the carrier gas delivered to the second port such as to separate a volume, as a sample plug, from the gaseous sample flow.
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