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Inlets
Split/Splitless Liners
Injection port liners have a variety of features to help vaporize the sample so that a true
representation of the sample enters the column. Additionally, Agilent liners are individually
packaged to maintain cleanliness until used. The part number and lot are silk screened
on the liner for quality control and user convenience, and lot tracking is available for
quality assurance.
Dimensions
Agilent liners are made to precise tolerances to ensure GC system accuracy and
reproducibility. Controlling the dimensions of the glass provides better consistency from
liner to liner, resulting in more reproducible results.
Outer Diameter (OD)
Splitless injection liners have a larger OD with a tight fit to improve analyte recovery and
limit sample migration out of the liner onto the metal surface of the inlet. Smaller OD
liners are used with split injection because there is less resistance to carrier and split flow
in the inlet.
Internal Diameter (ID)
Internal Diameter creates the space for the sample to be vaporized. The sample vapor
must be small enough to fit within the volume of the liner to avoid backflash, loss
of sample into the septum purge, or split lines, which result in reduced reproducibility
and sensitivity.
Length
T
ight tolerances of liner length are needed to control internal volume and ensure proper
sealing between the septum and the inlet seal. Length can also be critical for more
repeatable positioning in the inlet relative to the inlet bottom since many analysts install
liners by measuring the distance from the O-ring to the top of the liner. Agilent has
designed liners with precise glass bumps on the bottom of the liner to automatically
position the liner in the inlet for greater reproducibility.
Tips & Tools
Tight control of liner dimensions is
critical to reproducibility of GC results.
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