Split/Splitless Capillary Inlets; Changing Septa - HP 5890 Series II Plus Reference Manual

Preventive Maintenance

Split/splitless capillary inlets

Split/splitless capillary inlets

Changing septa

For a conventional disk•typeseptum, lifetime is dependent upon needle
quality; needles should be sharply pointed and free of burrs or rough
surfaces.
Choice of septum material is less critical than with a packed column inlet
since the septum is continually purged. Thus, septa can be chosen
primarily for durability. Septa, 11 mm (Part No. 5181•1263,package of
25) are recommended.
Note that regardless of the material, septa must be clean and free of
particulate matter.
WARNING Exercise care! The oven and/or inlet or detector fittings may be hot
enough to cause burns.
If operating in split mode, carrier gas pressure must be reduced before
Caution
opening the inlet. If not done, pressure may blow insert packing out of
the inlet, altering its characteristics.
Column flow is interrupted while changing septa; since capillary
Caution
columns may be damaged at elevated temperature without carrier flow,
cool the oven to ambient before proceeding.
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