Gas purifiers are an essential part of your GC analysis. Without the appropriate gas purifier, problems such as noisy baselines, moisture entering GC column, excessive bleed, reduced column lifetime and irreproducible results will occur. These problems are created by hydrocarbons, moisture and oxygen in the carrier gases. It is recommended to use individual purifiers to handle each of these typical contaminants.
Which Purifier?
As a minimum requirement for capillary gas chromatography, especially for a new GC, SGE recommends the kit be connected as shown below, consisting of four gas purifiers to remove moisture, contaminating organic substances and oxygen.
GC Gas Purifiers
Gas Purifier Kit
contains:
High Capacity Moisture trap
High Capacity Hydrocarbon Trap
High Capacity Oxygen Trap
Back-up Indicating Oxygen Trap
Part no. 
 | Description
| |
|---|---|---|
| 103494 | Gas Purifier Kit |  |
Gas Purifier Selection
| 1 |
Removes Moisture
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These are gas filters for applications requiring high-efficiency moisture removal, with the benefit of a depletion indicator. Up to 6 grams water is removed to low ppb levels. The adsorbing materials are Molecular Sieve 5A and cobalt-free CoFree™ indicator, held in a sturdy glass tube. The gas to be purified contacts only glass, metal and the adsorbents.
CoFree™ changes color from orange to green at about 5% relative humidity to signal leaks in the system; the molecular sieve removes moisture to trace evels. The glass tube is sealed with a special dual sealing system for extra protection from leaks. An internal frit at each end prevents particulate contamination. The inner glass tube is enclosed in a plastic outer tube for safety. Dimensions: 3.5 cm x 26 cm, maximum pressure 6.8 bar (100 psig).
* For 1/4" fittings contact your local SGE office.
| 2 |
Removes Organics
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The Hydrocarbon trap removes C5 weight and heavier hydrocarbons from inert gases, air or hydrogen to low ppb levels. It has an impervious outer stainless steel casing.
* For 1/4" fittings contact your local SGE office.
| 3 |
Removes Oxygen
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• Huge 2.5 L capacity; reduces O2 to low ppb levels.
• Advanced adsorbent technology.
• Outstanding efficiency in a small, high performance design.
• Recommended for GC/MS carrier gas.
Provides an extra large 2.5 L capacity for oxygen removal for long term purifications. May be used in any application requiring zero-grade oxygen-free gas.
* For 1/4" fittings contact your local SGE office.
| 4 |
Indicating Oxygen Trap
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The Indicating O2 Trap is an improved, compact indicating filter for high-efficiency oxygen removal, suitable for use with chromatography carrier gas streams. It removes oxygen to low-ppb levels, with an indicator that changes color from green to gray when adsorption capacity is depleted. The adsorbent forms copper oxide in the presence of oxygen; no gas is generated. The Indicating Oxygen Trap is recommended as a downstream indicator for high-capacity oxygen traps. It can be used with non-oxidizing gases such as He, Ar, N2, H2 or CH4. The adsorbents are held in a heavy-walled inner glass tube, shielded by an outer clear plastic tube for increased safety. Maximum pressure is 6.8 bar (100 psig). Approximate dimensions are 3.5 cm x 26 cm including fittings.
* For 1/4" fittings contact your local SGE office.
