Replacing The Active Element (Bead) - Agilent Technologies 6890 Series Service Manual

Gas chromatograph

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Replacing the active element (bead)

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

down. Turn off any hydrogen gas at its 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.

While performing this procedure, do the following:

Leave all detector gasses, except hydrogen, turned on to purge

contamination. Turn hydrogen off.

Make sure the detector has cooled to(<150°C) before beginning, or the

bead may be damaged by exposure to air.

Two ceramic beads are available:

Turn off the detector active element through the keyboard.

Nitrogen Phosphorus Detector (NPD)

Durable, no phosphorus

Agilent 6890 Gas Chromatograph Service Manual

Replacement procedures

Disadvantages

Phosphorus tails

Lower nitrogen

sensitivity,

6890a 6890 plus