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Oxygen traps usually include a metal-containing inert support reagent. Most oxygen traps
reduce the oxygen concentration to below 15-20 ppb. The capacity of a standard oxygen
trap is approximately 30 mg of oxygen per 100 cc of trap volume. Oxygen traps can also
remove some small organic and sulfur compounds from gas streams, but this is not their
primary application.
Metal (usually aluminum) trap bodies are recommended for GC analyses. Some plastics
are permeable to air and contain contaminants that can degrade gas quality. In addition,
many of the metal bodied oxygen traps can withstand high pressures (up to 2000 psi).
Some oxygen traps also remove moisture from the gas stream without affecting the
oxygen removal capability.
Indicating oxygen traps change color when oxygen is present in the gas at harmful levels.
Indicating traps are not intended to be the primary oxygen removal trap, but should be
used in conjunction with a high capacity non-indicating oxygen trap. They are installed
after the high capacity oxygen trap in the gas line to indicate when the high capacity trap
has expired and needs to be changed. Expired oxygen traps need to be immediately
changed since they can contaminate the gas, in addition to failing to remove oxygen.
Oxygen Traps
Description Size
(cc)
1/8 in.
Part No.
1/4 in.
Part No.
Indicating Oxygen Traps (IOT and LIOT Series)
Indicating Oxygen Trap 30 IOT-2-HP IOT-4-HP
Large Indicating Oxygen Trap 150 LIOT-2 LIOT-4
Economy Non-Indicating Oxygen T
raps (OT1 Series)
Oxygen Trap 70 OT1-2 OT1-4
Big Oxygen Traps (BOT Series)
Big Oxygen Trap 750 BOT-2 BOT-4
Tips & Tools
Oxygen traps are critical on carrier
gas supplies to prevent column
bleed. They are also recommended
with ECD.
Indicating oxygen trap, IOT-2-HP
Oxygen Traps
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