14 Operating Guide
1 Introduction
Automatic injectors
The Agilent 7820A GC can accommodate up to two
autoinjectors, identified as Front Injector and Back Injector.
Automatic gas sampling valves
The sampling valves are simple mechanical devices that
introduce a sample of fixed size into the carrier gas stream.
Valves are most frequently used to sample gases in
constantly flowing streams.
The Agilent 7820A GC can accommodate up to two gas
sampling valves, identified as Valve # 1 and Valve #2.
The valves are located inside the gas sampling valve box.