Replacing The Uecd Makeup Gas Adapter - Agilent Technologies 7820A Service Manual

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Agilent 7820 GC Service
Slide the heater and sensor out of the lower heated block.

Replacing the uECD makeup gas adapter

After removing the uECD detector from the GC, you can further
disassemble it to replace the makeup gas adapter. The makeup
gas adapter consists of a line from the detector pneumatics
manifold that carries makeup gas to a weldment that screws into
the bottom of the uECD detector. From there, the makeup gas
sweeps past the end of the column and carries the column
effluent into the uECD cell.
1 Remove the detector.
Remove the Torx T-20 screw holding the pneumatics block(s) to
the detector manifold.
Slide the makeup gas adapter up and out of the GC.
When re-installing the makeup gas adapter, ensure the following:

Approximately 6 inches of the makeup gas line resides in
the oven after installation.

The makeup gas line is bent into a coil or loop (inside the
oven) that loops around the bottom of the detector
weldment and makeup gas adapter.