Agilent Technologies 6890 Series Service Manual page 219

Gas chromatograph

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Table of Contents

Flame Ionization Detector (FID)

Replacement procedures

Detector weldment

Figure 310-10

Use an inert gas to blow any debris out of the detector weldment.

Replace the jet with a new jet. (Although replacement is highly

recommended, the jet may be cleaned and reinstalled at the operator's

discretion. Use an approved solvent and a cleaning wire to clean the jet.)

Install the replacement jet finger-tight. (Use two fingers on the nut driver

to obtain this tightness.) Then, tighten the jet 1/8 turn past finger tight

using the nut driver.

Reinstall the collector block so that it seats flush on the detector base. If

the block does not seat flush, the electrometer spring is not seated

properly and will cause a short circuit if it is not corrected.

Reinstall the column and column nut. When installing the column, push

it up until it touches the top of the inside of the FID jet. Gently hold the

column in this position while you tighten the column nut.

Removing the collector block

Agilent 6890 Gas Chromatograph Service Manual

Ignitor assembly and copper washer

Troubleshooting

6890a 6890 plus