The gas chromatograph mainly has two types of gas paths: single-column single-gas path and double-column double-gas path. The structure and working process are transmitted as shown below:

Schematic diagram of single column single gas path

1 — carrier gas cylinder; 2 — pressure reducing valve; 3 — purification pipe; 4 — air flow regulating valve;

5 —Rotor flowmeter; 6- pressure gauge; 7 —injector; 8 —column;

9 — detector; 10 — amplifier; 11 — temperature controller; 12 — recorder

Double column double gas path structure diagram

1 — carrier gas cylinder; 2 — pressure reducing valve; 3 — purification pipe; 4 — voltage regulator valve;

5- pressure gauge; 6 , 6 ^ˊ — needle valve; 7 , 7 ^, — rotameter;

8 , 8 ^, — injector; 9 , 9 ^, — column; 10 — detector

The two-column dual-gas GC has two columns, so it has the function of two gas chromatographs.

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