| 摘要 |
PURPOSE: To reduce the cost of a gas chromatrograph by simplifying its structure. CONSTITUTION: A pressure control valve is abolished, and a flow control valve 16 placed between a sample vaporizing chamber 17 and a differential pressure sensor 15 (flow resistance 14) is placed upstream the differential pressure sensor 15. A control portion 10 controls the flow rate F of a carrier gas using [F= K×(Pvp +ΔP)×(ΔP)<n> ], Pvp being a value detected by the pressure sensor 19,ΔP a value detected by the differential pressure sensor 15, and K, (n) constants.
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