How to Install Two GC Columns in One Inlet | Dual-Column Capillary Installation
One GC inlet can be configured for two capillary columns.
In this video, I show how I convert a single-column installation to a two-column installation in the same GC inlet.
I walk through:
• Removing the existing single-column connection
• Preparing both capillary columns
• Using a dual-column inlet adapter
• Installing a two-hole Vespel/graphite ferrule
• Measuring the correct insertion depth
• Positioning both columns in the inlet
• Tightening the connection
• Checking the final dual-column installation
This configuration allows two capillary columns to share one inlet while maintaining separate downstream column paths.
It is a useful setup when a method requires dual-column operation from a single injector.
Vineta Mills Consulting
Practical GC and GC/MS maintenance, troubleshooting, chromatography, method development, software, and laboratory training.
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