Patent ID: 8499615

Claim:
A gas chromatograph in which a material sample is conductable through a first separating device and subsequently conductable through a second separating device by a carrier gas, the gas chromatograph comprising: a pressure regulator configured to regulate a pressure of the carrier gas introduced into the first separating device; a controllable switching device for discharging components of the material sample from a path to the second separating device, the switching device being arranged between the first and second separating devices and comprising: a main gas path between the two separating devices; and a first auxiliary gas path and a second auxiliary gas path, the first and second auxiliary gas paths being fed with the carrier gas, contain a plurality of flow resistors arranged in series between an inlet and an outlet for the carrier gas, and being connected to the main gas path by a connecting gas path between the plurality of flow resistors, the first auxiliary gas path being connected to the main gas path at a connection point adjacent to the first separating device, and the second auxiliary gas path being connected to the main gas path at a connection point adjacent to the second separating device, and one of the first and second auxiliary gas paths having a controllable valve connected in parallel with the flow resistor in a path section between the inlet thereof and the connecting gas path; and a further flow resistor arranged in a path section containing the controllable valve, in series with the controllable valve and the flow resistor in parallel with the controllable valve; wherein the inlet of the first and second auxiliary gas paths is connected to the outlet of the pressure regulator; and wherein the plurality of flow resistors and the further flow resistor are fixed resistors.