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• Clean or replace the FID jet (better to
replace)
• Clean or replace the FID collector and Teflon
insulators (better to replace)
• Inspect the underside of the brass castle
assembly for rust or corrosion and replace if
dirty
• When reassembling the FID make sure that
all mechanical assemblies are tight and that
the interconnect spring does not get
deformed. It should be oriented into the
channel on the outer perimeter of the FID
collector.
• Plug the FID column fitting to continue with
the troubleshooting procedure.
7. Relight the flame and bakeout the detector
at 350°C for an hour.
Released: April 2004
8. Re-evaluate the FID noise and background at
If the noise or background is still too high, the
Air, H
FID can be operated with just Air and H
off the makeup gas and reevaluate the FID noise.
If there is a significant drop in noise or back-
ground (>5 pA drop in background) then the
makeup gas purity is suspect. Try replacing or
installing traps in the makeup gas supply as
outlined in the overview. If the problem persists
then try installing/replacing moisture traps in the
H
2
H
2
6850 Series Gas Chromatograph Service Procedures
normal FID and GC oven operating tempera-
ture.
and Makeup gas purity is suspect. The
2
and Air supplies or try alternate sources for
and Air.
. Turn
2
301
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