Flow Controller and Gas Chromatograph Apparatus Using the Same

A flow controller including:

• a flow channel resistance disposed in a carrier gas supply flow channel;
• a control valve provided on a downstream side of the flow channel resistance and being capable of adjusting an opening degree;
• a pressure detecting portion configured to detect a supply pressure pin on an upstream side of the flow channel resistance;
• and
• a pressure difference detecting portion configured to detect a pressure difference Δp between the supply pressure pin on the upstream side of the flow channel resistance and a pressure on the downstream side, the flow controller comprising:
• a storage part configured to store a first calibration curve indicating a correlation between a pressure difference Δp and a total flow volume ftemp1 at a first set supply pressure Pin, ref1 and a second calibration curve indicating a correlation between a pressure difference Δp and a total flow volume ftemp2 at a second set supply pressure Pin,ref2 larger than the first set supply pressure Pin,ref1, wherein
• a total flow volume f of the carrier gas is calculated based on the supply pressure pin detected by the pressure detecting portion, pressure difference Δp information detected by the pressure difference detecting portion, the first calibration curve, and the second calibration curve.