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6. Trace the ignitor cable from the FPD to its
source on the detector board, and disconnect
it. Note the locations of the signal and high
voltage cables, then remove them from the
board.
7. If removing the detector board(s), loosen the
captive mounting screw in each board
bracket and remove each board from the GC.
8. If removing the EPC flow module, disconnect
the ribbon cable from the pneumatics PCB
and remove the mounting screw in the top of
the module. If not removing the EPC flow
module, disconnect the gang fitting at the
module. Inspect the O-rings in the gang fit-
ting and replace if damaged. Straighten the
tubing from the gang fitting and slide the
module out of the GC.
9. Remove the four mounting screws in the FPD
bracket and remove the FPD.
Released: April 2004
10. Reassemble in reverse order.
Column installation
Special FPD adapters
The FPD uses special adapters for capillary
columns and 1/8-inch OD PTFE columns. The FPD
Capillary Adapter allows fused silica columns as
large as 530 µm id to be run right to the base of
the FPD flame, minimizing sample tailing or loss
of chemically active sites. The FPD 1/8-inch od
Adapter allows installation of PTFE columns
concentrically around the FPD fused silica liner,
eliminating exposed hot stainless steel.
Capillary column installation
With the FPD capillary adapter installed, fused
silica columns as large as 530 µm id may be
installed up through the FPD Fused Silica Insert
to the base of the flame as follows:
6850 Series Gas Chromatograph Service Procedures
174
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