Site Preparation
Cryogenic cooling requirements
18
Table 7. 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 4. Traps
Cryogenic cooling requirements
Cryogenic cooling allows you to cool the oven below ambient temperature. A
solenoid valve introduces liquid coolant, either carbon dioxide (CO
2
) or nitrogen
(N
2
), to cool the oven to the desired temperature.
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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