How does the sample reach the analyzer in the F-900?

In Continuous monitoring mode, gas enters through the inlet of the device and is drawn in by the pump. The inlet can be free of tubing, in which case it will measure ambient air, or it can be connected by tubing to a chamber or other measurement location or apparatus.

In GC Emulation Mode samples are injected into a special port that connects to both the inlet and outlet of the device.