Routine Maintenance: Inlets
Maintaining a purged packed inlet
Released: March 2004 6850 Series II GC User Information page 140 of 256
The useful lifetime of septa is determined by injection frequency and needle
quality; burrs, sharp edges, rough surfaces, or a blunt end on the needle
decrease septum lifetime. When the instrument is used regularly, daily septum
replacement is recommended.
The type of septa you use will depend on your chromatography needs. You can
order septa directly from Agilent Technologies; see the Agilent catalog for
consumables and supplies for ordering information.
Table 28. Recommended Septa for the Purged Packed Inlet
Warning Be careful! The oven and/or inlet may be hot enough to cause burns.
Caution Column flow is interrupted while changing septa; since columns may be dam-
aged at elevated temperatures without carrier flow, cool the oven to room
temperature before proceeding.
Materials needed:
• Gloves (if the inlet is hot)
• New septum
• Septum nut wrench (part no. 19251-00100)
• A plastic or wood tool with a sharp tip to remove septum from inlet
• 0- or 00-grade steel wool (optional)
• Forceps or tweezers
• Compressed, filtered, dry air or nitrogen (optional)
Description Part no.
11-mm septum, low-bleed red 5181-1263
11-mm septum with partial through-hole, low-bleed red 5181-3383
11-mm septum, low-bleed gray 5080-8896
Merlin microseal septum 5181-8815
11-mm high-temperature silicon septum (350°C and higher) 5182-0739
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