11 of 24
Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Electron Capture Detector (ECD) 340
Replacement procedures
Figure 340-9 Proper configuration of the column and makeup gas tubing
• The end of the column should protrude about 1 mm from the top of
the makeup gas adapter. The total dimension from the back of the
column nut to the end of the column will be about 75 to 76 mm.
Removing the EPC flow manifold
The ECD detector uses a Type 1 EPC flow manifold that contains one inlet
supply fitting for a purge/makeup gas.
WARNING Before proceeding, turn off the oven and any heated zones and let them cool
down. Turn off any detector gases at their supply, then turn off the main
power switch and unplug the power cord.
1. Remove the top plastic covers from the detector and pneumatics areas.
Also remove the RFI metal shield and the top rear metal cover.
Coil loops around
bottom of detector and
makeup gas adapter
connection.
Column
should
protrude
about 1 mm
Makeup gas
adapter
Column nut
Column
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