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Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Flame Photometric Detector (FPD) 350
Replacement procedures
Replacing the transfer line fused silica liner
Occasionally the transfer line fused silica liner between the column and FPD
module must be inspected, cleaned, and/or replaced.
1. Turn off power to the gas chromatograph and disconnect the main power
cord. Remove the detector covers.
2. Allow time for heated zones to cool to safe temperatures.
3. Inside the oven, remove the column to the FPD.
Caution Always turn the electrometer or the main power off before removing the PMT
housing to avoid destroying the tube.
4. Remove the photomultiplier tube assembly—or assemblies—from the
detector module; also remove the filter(s). Set them in a safe place. Keep
the open end of the PMT covered whenever practical to avoid light damage
to the tube.
5. Locate the ignitor cable attached to the side of the detector. Trace the
cable back to the printed circuit board and disconnect it there.
6. Remove the exhaust tubing and the sheet metal cover—on the single
wavelength detector, it is held by two screws on the top and two at the
bottom; on the dual wavelength detector, it is held by two screws at the
top.
7. Remove the four screws that attach the detector to the top of the oven
(one at each corner). Remove the detector from the GC.
8. Loosen the transfer line nut. Remove the two screws that secure the
U-clamp to the detector frame. Remove the U-clamp and the attached
parts from the bottom of the detector.
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