520 Gases
The gas plumbing
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Jun 2001
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Agilent 6890 Gas Chromatograph Service Manual
Traps
Using chromatographic-grade gases insures that the gas in your system is
pure. However, for optimum sensitivity, it is highly recommended that you
install high-quality traps to remove traces of water or other contaminants.
After installing a trap, check the gas supply lines for leaks.
Table 520-4 Recommended Traps
Moisture in carrier gas damages columns. We recommend a type 5A Molecular
Sieve trap after the source regulator and before any other traps.
A hydrocarbon trap removes organics from gases. It should be placed after a
molecular sieve trap and before an oxygen trap, if they are present.
An oxygen trap removes 99% of the oxygen from a gas plus traces of water. It
should be last in a series of traps. Because trace amounts of oxygen can
damage columns and degrade ECD performance, use an oxygen trap with
carrier and ECD gases. Do not use it with FID, FPD, or NPD fuel gases.
Figure 520-3 Traps
Description Part No.
Preconditioned moisture trap: metal casing, s-shaped trap for carrier gas cleanup.
Contains Molecular Sieve 5A, 45/60 mesh, and 1/8-inch fittings.
5060-9084
Hydrocarbon trap: metal casing, s-shaped trap filled with 40/60 mesh activated
charcoal, and 1/8-inch fittings
5060-9096
Oxygen trap (for carrier and ECD gases): metal casing, and 1/8-inch brass fittings.
Oxygen trap cannot be reconditioned.
3150-0414
Molecular sieve or hydrocarbon trap—both are S-shaped
Oxygen trap
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