44 Advanced Operation Manual
3 Inlets
About the Split/Splitless Inlet
This inlet is used for split, splitless, pulsed splitless, or
pulsed split analyses. You can choose the operating mode
from the inlet parameter list. The split mode is generally
used for major component analyses, while the splitless mode
is used for trace analyses. The pulsed splitless and pulsed
split modes are used for the same type of analyses as split
or splitless, but allow you to inject larger samples.
Septum tightening (S/SL)
Septum retainer nuts must be tightened enough to obtain a
good gas seal, but not so much as to compress the septum
and make it difficult to push a syringe needle through it.
For the standard septum retainer nut, an internal spring in
the septum retainer applies pressure to the septum. For inlet
pressures up to 100 psi, tighten the retainer until the C- ring
lifts about 1 mm above the top surface. This is adequate for
most situations.
With higher inlet pressures, tighten the septum retainer until
the C- ring stops turning, indicating that the retainer is in
firm contact with the septum.
If using a Merlin Microsealâ„¢ septum, finger tighten the
septum nut, until snug (not loose). The pressure capacity
depends on the duckbill seal used.
Standard and high-pressure versions of the S/SL inlet
The standard split/splitless inlet is rated to 100 psi pressure
at the inlet. It is appropriate for most columns. The
high- pressure inlet is rated to 150 psi pressure—it is useful
with very small diameter capillary columns that offer
considerable resistance to gas flow.
Recommended source pressures are 120 psi and 170 psi
respectively.
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