Replacing The Transfer Line Fused Silica Liner - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

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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.

Turn off power to the gas chromatograph and disconnect the main power

cord. Remove the detector covers.

Allow time for heated zones to cool to safe temperatures.

Inside the oven, remove the column to the FPD.

Always turn the electrometer or the main power off before removing the PMT

housing to avoid destroying the tube.

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.

Locate the ignitor cable attached to the side of the detector. Trace the

cable back to the printed circuit board and disconnect it there.

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

Remove the four screws that attach the detector to the top of the oven

(one at each corner). Remove the detector from the GC.

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.

Agilent 6890 Gas Chromatograph Service Manual

Flame Photometric Detector (FPD)

Replacement procedures

6890a 6890 plus