| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need for an expensive pressure regulator and to select the supply pressure of a carrier gas arbitrarily by connecting a channel resistor with a pressure sensor and a differential pressure sensor and a control valve to a canier gas supply channel. SOLUTION: A control part 9 stores an expression Q=K×P1×ΔP inside and the pressure P1 that is measured by a pressure sensor 21 is constantly inputted into the expression. In the expression,ΔP is the flow rate of a carrier gas, K is a coefficient that is determined by a resistance pipe 3, P1 is a pressure at the upstream of the resistance pipe 3, andΔP is a differential pressure that is measured by a differential sensor 4. The control part 9 obtains a differential pressure (ΔPSET) corresponding to a desired flow rate and sends a signal to a control valve 5 so that a differential pressure that is measured by the differential pressure sensor 4 becomesΔPSET. A carrier gas whose flow rate is controlled by the control part 9 carries a sample that is introduced to a sample introduction part 6 to an analysis column 7 and a sensing part 8. After the sample is separated from an analysis column 7, it is determined qualitatively and quantitatively by the sensing part 8.
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