22 7820A GC Site Preparation Guide
1 7820A GC Site Preparation
Traps
Using chromatographic-grade gases ensures that the gas in your
system is pure. However, for optimum sensitivity, install
high-quality traps to remove traces of water or other
contaminants. After installing a trap, check the gas supply lines
for leaks.
Table 11 lists the recommended traps. See the Agilent online
store for the complete listing of traps and trap accessories. As
shown in Figure 3, install the indicating trap last so that it
warns when the combination begins to fail.
Moisture in carrier gas damages columns. Agilent recommends
installing a moisture trap after the source regulator and before
any other traps.
A hydrocarbon trap removes organics from gases. Place it 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. Place it last in a series of traps. Because trace
amounts of oxygen can damage columns and degrade uECD
performance, use an oxygen trap with carrier and uECD gases.
Do not use it with FID or NPD fuel gases.
Table 11 Recommended traps
Description Part number
Big universal trap. Removes oxygen, moisture, hydrocarbons,
carbon dioxide and carbon monoxide from helium gas
streams.
RMS
Indicating oxygen trap (for carrier and ECD gases). IOT-2-HP
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