Patent ID: 9588088
Date: 2017-03-07
CPC Classifications: G01N

Claim:
1. A gas sample introduction device for introducing sample gas into a gas analysis device, comprising: a) a metering tube having a predetermined volume; b) a sample gas supply channel for introducing sample gas into said metering tube; c) a carrier gas supply channel for introducing carrier gas into said metering tube; d) an evacuation channel for discharging gas which has passed through said metering tube to the outside; e) a concentrating means which comprises a collection tube containing an adsorbent and concentrates the sample gas through thermal desorption; f) a first channel changeover valve which switches between a load state in which said metering tube is interposed between said sample gas supply channel and said evacuation channel and an injection state in which said metering tube is interposed between said carrier gas supply channel and said gas analysis device; and g) a second channel switching valve which, in said load state and said injection state, switches between a collection tube interposition state and a collection tube shunt state, wherein, in said collection tube interposition state, said collection tube is interposed between said sample gas supply channel and said metering tube when said first channel changeover valve is in said load state, and wherein, in said collection tube shunt state, said collection tube is disconnected from said sample gas supply channel and said metering tube.