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Preventive Maintenance
Packed column inlet
Packed column inlet
Changing septa
Septum lifetime is dependent upon frequency of use and upon needle
quality; burrs, sharp edges, rough surfaces, or a blunt end on the needle
decreases septum lifetime.
A leaking septum is evidenced by longer retention times, loss of response,
and/or loss of column head pressure as well as degradation in detector
signal quality (the signal becoming increasingly noisy). Where the
instrument is used on a regular basis, daily septum replacement is
recommended.
Figure 8-2
Packed Column Inlet, Replacing the Septum
Turn off the detector (particularly a TCD or NPD!) before interrupting
Caution
column flow.
Septum
Septum Retainer
Nut
159
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Troubleshooting
