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Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Micro-cell Electron Capture Detector (µ-ECD) 341
Replacement procedures
Replacing the makeup gas adapter
After removing the µ-ECD 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 µ-ECD detector. From there, the
makeup gas sweeps past the end of the column and carries the column effluent
into the µ-ECD cell.
1. Remove the detector as described in the Replacing the entire detector/
detector cell procedure in this section.
2. Remove the Torx T-20 screw holding the pneumatics block(s) to the
detector manifold.
Note There are two pneumatics blocks on the EPC version of the µ-ECD pneumatics
manifold. The outside block is the anode purge gas line and the inside block
is the make-up gas line.
3. Slide the makeup gas adapter up and out of the GC.
4. 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.
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