Patent ID: 8240334

Claim:
An arrangement for metering a gaseous sample in a carrier gas stream comprising: a sample gas path; a carrier gas path; a carrier gas source of constant pressure, the sample gas path and the carrier gas path both being connected to the carrier gas source; a controllable metering device arranged between the carrier gas source and the sample gas path for feeding a sample gas slug into a carrier gas stream through the sample gas path; a connection gas path between the sample gas path and the carrier gas path; a device for introducing different pressures in the sample gas path and the carrier gas path for extracting and diverting a metered amount from the sample gas slug by way of the connection gas path into the carrier gas stream through the carrier gas path; a first flow resistance in the sample gas path between the carrier gas source and the metering device so that no portion of the sample gas slug flows through the first flow resistance; a second flow resistance in the sample gas path downstream of the branch of the connection gas path; wherein a gas volume of the sample gas path between the branch of the connection gas path and the second flow resistance is dimensioned such that no portion of the sample gas slug flows through the second flow resistances when the metered amount is extracted and diverted from the sample gas slug.