Page 337 - Praxair - Specialty Gases and Equipment Reference Guide

Purifiers/Filters

Gas Specific Purifier and Containment Trap Purifiers

Gas specific purifier modules are designed to be placed in-line with
the Gas Chromatograph (GC) carrier gas supply or the GC detector
gas supply. There are three groups of contaminants that impact gas
chromatography: moisture, hydrocarbons and oxygen. The Gas
Specific Purifiers remove the three contaminant groups from analytical
gases prior to entering the GC. Proprietary absorptive materials
capture and retain contaminants for the operating life of the purifier.
The new gas specific purifier modules offer dramatic reductions in
most contaminant levels (from many parts per million to levels that are
below the lower limit of analytical detection) and absorb a larger num-
ber and variety of contaminants than other competitive products. The Inlet gas containing High purity
performance is optimized by incorporating a multiple bed form so that oxygen, moisture and outlet gas
each successive bed functions at a lower contaminant concentration. hydrocarbons
The result is a series of contaminant concentration gradients across
the length of the purifier module. When these advanced materials
and design features are combined with a known gas contaminant
concentration, the following performance should be achieved.
Gas purifiers are designed to help insure the purity of your analytical
gases at the point of use. Even though you may be purchasing ultra-
high purity gases, your delivery system may be compromising the level By combining several beds of specialized sorbent materials,
of gas purity you require. The best way to make sure your instruments a contaminant gradient is formed across the entire length of
are receiving the highest level of gas purity is to utilize point of use the purifier. This successive bed format achieves the highest
purification. purity gas commercially available.

Features and Benefits
n Decrease baseline noise and increase GC/MS sensitivity Designed to deliver gases
n Reduce gas impurities from high ppm to low ppb levels at the point of use that
n The ultimate purification technology are at least as pure as
what was purchased in
Specifications the cylinder. Point of use
n Length n Pressure Drop, 827 kPa purification is the best
21" (52.3 cm) (120 psig) inlet, at a flow of way to help insure that
n Diameter 0 to 500 ml/min
1.5" (3.8 cm) < 2.1 kPa (0.30 psig) your application is receiv-
n Maximum Inlet Pressure n Compression End ing the highest level
300 psig (2070 kPa) Connections of gas purity possible.
Section E – Gas Handling Equipment
n Maximum Recommended 1/8" or 1/4"
Flow n Shipping Weight
500 ml/min 1.76 lb (800 g)
Ordering Information
Product Description Part Number Fitting CO CO 2 O 2 H 2 O Sulfur NMHC*
Compounds
Helium Purifier PRS-100-1 1/8" < 1 < 1 < 1 < 1 < 1 < 3
PRS-100-2 1/4"
Hydrogen Purifier PRS-200-1 1/8" < 1 < 1 < 1 < 1 < 1 < 3
PRS-200-2 1/4"
Nitrogen Purifier PRS-300-1 1/8" < 1 < 1 < 1 < 1 < 1 < 3
PRS-300-2 1/4"
Air Purifier PRS-400-1 1/8" < 1 < 3
PRS-400-2 1/4"
Moisture Trap PRST-100-1 1/8" < 1
PRST-100-2 1/4"
Hydrocarbon Trap PRST-200-1 1/8" < 3
PRST-200-2 1/4"
Oxygen Trap PRST-300-1 1/8" < 1 < 1
PRST-300-2 1/4"
Sulfur Trap PRST-400-1 1/8" < 1 < 1
Methane Purifier PRST-500-1 1/8" < 1 < 1 < 1 < 1 < 1 < 3
Note: Above values are expressed as ppb levels. * NMHC stands for non-methane hydrocarbons.
Guide assumes inlet gas supply less than 50 ppm (contaminents).

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