1 Getting Startedï€
Operation Manual 15
Inlets
Inlets are where samples are injected into the GC. The Agilent 8890 GC can have a maximum
of two inlets, identified as Front Inlet and Back Inlet.
The following inlet types are available:
• Split/splitless inlet (SSL)
• Purged packed inlet (PP)
• Multi-Mode Inlet (MMI)
• Cool on column inlet (COC)
• Programmed Temperature Vaporization Inlet (PTV)
• Volatiles Interface (VI)
The type of inlet chosen is based on the type of analysis being done, the type of sample being
analyzed, and the column being used.
Samples can be injected into the inlets by hand using a syringe, or an automatic sampling
device (such as an Agilent Automatic Liquid Sampler or Agilent Headspace Sampler).
Automatic injectors
The Agilent 8890 GC can accommodate up to two autoinjectors, identified as Front Injector
and Back Injector.
Automatic sampling valves
The optional 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 8890 GC can accommodate up to two gas or liquid sampling valves, identified as
Valve #1 and Valve #2.
The valves are located inside the sampling valve box.
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