Replacing The Jet - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

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Nitrogen Phosphorus Detector (NPD)

Replacement procedures

Replacing the jet

After removing the collector assembly, you can replace the jet. If

contamination is present in the detector, replacement of the jet is

recommended. However, the jet can be cleaned as described in the Cleaning

the jet procedure in this section.

Before proceeding, turn off the oven and any heated zones and let them cool

down. Turn off any detector gases at their supply. Then turn off the main

power switch and unplug the power cord.

To avoid detector contamination, use clean lint-free gloves when handling the

internal detector components. The detector bead is fragile, avoid touching

the bead or letting it touch other surfaces.

Remove the collector as described in the Removing the collector assembly

Use a 1/4-inch deep-socket nut driver to unscrew the jet.

Use slight side pressure on the nut driver to drag the jet up out of the

detector weldment and then use tweezers to grasp and remove the jet.

Agilent 6890 Gas Chromatograph Service Manual

6890a 6890 plus