9 of 36
Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Flame Photometric Detector (FPD) 350
Replacement procedures
4. Pull the PMT housing off the detector module and remove the filter from
the detector. Use lint-free lens tissue to clean the filter on both sides. Also
clean the window in the PMT tube. Be careful to not scratch the surfaces;
do not use a cleaning fluid that might leave a film upon drying. Keep the
open end of the PMT covered whenever practical to avoid light damage
to the tube.
Figure 350-4 Removing the PMT filter
5. Inspect the filter: chips, scratches, and/or cracks in the light path scatter
light, reducing detector sensitivity. Replace filters as necessary.
Inspect the PMT window for damage; if necessary, replace the PMT. See
Replacing the photomultiplier tube.
Loosen screws
Loosen screw
Filter
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