Site Preparation
The gas plumbing
14
Generally, all gas supplies used should be in the 99.995% to 99.9995% purity range.
Only very low levels (<
0.5 ppm) of oxygen and total hydrocarbons should be
present. Oil-pumped air supplies are not recommended because they may
contain large amounts of hydrocarbons.
The addition of high-quality moisture and hydrocarbon traps immediately after
the main tank pressure regulator is highly recommended. Refer to the next
section, “Assembling the Gas Plumbing,” for more information on using traps.
Table 6. Gas Purity Recommendations
The gas plumbing
WARNING All compressed gas cylinders should be securely fastened to an immovable
structure or permanent wall. Compressed gases should be stored and handled
in accordance with the relevant safety codes.
Gas cylinders should not be located in the path of heated oven exhaust.
To avoid possible eye injury, wear eye protection when using compressed gas.
Follow the general plumbing diagram in when preparing gas supply plumbing.
Carrier gases and capillary makeup gases
Helium 99.9995%
Nitrogen 99.9995%
Hydrogen 99.9995%
Argon/Methane 99.9995%
Detector support gases
Hydrogen 99.9995%
Air (dry) Zero-grade or better
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