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Purged Packed Inlet Troubleshooting
Purged packed inlets are active, have low volume and are generally flow controlled.
This means that most packed column inlet problems involve sample decomposition,
flashback, or leaks.
Diagnose inlet sample decomposition by comparing retention times for decomposition
products to their standard retention times. Then try these options to improve results:
• Intracolumn direct injection.
• Deactivated glass liners.
• Lower inlet temperatures.
• Remove column packing in the inlet zone.
• Increase flow rates.
Flashback
Large sample injections can exceed liner capacity and flash back into the gas supply lines
and onto the septum. This can cause:
• Ghost peaks.
• Sample losses.
• Irreproducible peak areas.
• Decomposition.
Leaks
Septum and column leaks can cause column degradation and stationary phase
decompositions on flow-controlled column inlets.
• Change the septum on a regular basis and check column connections to help
eliminate leak holes.
• Keep the oven and inlet at room temperature when not in use or while changing
the septum.
Decomposition
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