| 摘要 |
PURPOSE:To measure accurately a gaseous sample, to introduce it into a column at the same pressure as the equilibrium pressure and to eliminate an evil influence due to the variation of pressure by carrying out the equilibrium of pressure at sampling for measuring by a gaseous carrier at a substantially constant pressure. CONSTITUTION:A three-way solenoid valve 15 is inserted into the outlet of a pump 2, and a two-way solenoid valve 16 is connected to the inlet side of a flow meter 4 to move these valves mutually. In this gaseous sample flow passage 6, a buffer pipe 17 is inserted between the three-way solenoid valve and a sampling valve 13. The buffer pipe 17 is made of the same material as a measuring pipe 12 and has a volume about five times or more that of the said pipe 12. Thus, just before sampling, the gaseous carrier from a pressure gauge 9 is branched and passed to not only the three-way solenoid valve, but also a column 10. Consequently at the sampling time, only the gaseous sample at the same pressure is inserted into the column 10, and any variation of the pressure is not observed. |
