7820A GC Site Preparation 1
7820A GC Site Preparation Guide 19
Gas Plumbing
• Agilent strongly recommends two-stage regulators to
eliminate pressure surges. High-quality, stainless-steel
diaphragm-type regulators are especially recommended.
• On/off valves mounted on the outlet fitting of the two-stage
regulator are not essential but are very useful. Be sure the
valves have stainless-steel, packless diaphragms.
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.
Figure 3 Recommended traps and plumbing configuration from a carrier gas cylinder
Two-stage regulation
Main supply
on/off valve
Main gas supply
On/off valve
Big universal trap
(combination trap for moisture,
hydrocarbons, and oxygen)
Shutoff valve
Indicating oxygen trap
Trap size and shape will vary by manufacturer.
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