Installation, Operation, and Maintenance
VWR Zero Air Generator
Source Air Requirements
The source of compressed air should be regulated to be greater than the
requirements of the intended consumption. Pressure should not, however,
exceed 860 kPa (125 psig) and flow should not exceed 1000 cc/min
(0.035 ft
3
/min) for Model 26000-020, and 3500 cc/min (0.124 ft
3
/min) for Model
26000-022. Maximum operating efficiency occurs if the quality of the compressed
air source is maintained at less than 100 ppm total hydrocarbon content (THC).
This quality is achieved in most normal plant air systems equipped with an after
cooler. Centrally located compressed air system filtration is normally sufficient for
the zero air generator, but most compressed air piping systems contain some
rust and condensed liquids. VWR International recommends a coalescing filter
installed directly upstream from the inlet to the zero air generator to ensure the
removal of condensed liquids and rust from the plant air system.
If there is a risk that bulk contaminants may reach the generator inlet, use a
secondary depth type filter (such as Parker’s optional DXE filter
P/N 2002N-1B1-DX) in the source air line. This will extend the life of the primary
inlet filter.
If your plant air system does not sufficiently dry the air, install P/N 72-100
(Parker’s Inlet Compressed Air Conditioner) directly upstream from the inlet of
the zero air generator.
The catalyst can become contaminated if compounds that contain lead,
phosphorous, sulfur, silicates or halocarbons are present in the source air.
If in doubt, use an activated charcoal trap (such as Parker Hannifin’s
optional Halogenated Hydrocarbon Scrubber P/N 76080 in the source air
line to remove these chemical compounds).
3
Bulletin TI-ZAG3500-L1466
