MASTER PNEUMATIC PRODUCT RANGE
GENERAL PURPOSE FILTERS
General purpose compressed air filters remove water and particulate material from the air stream to
protect downstream equipment from contamination. As air enters the filter, internal baffles create a
swirling motion to the air, meaning entrained dirt and liquids are thrown against the sides of the filter
bowl and then fall to the sump area at the bottom of the bowl.
Additional baffling keeps the air in the sump area relatively quiet; this ensures that the removed
material is not returned to the air flow going to the filter element. The filter element will then collect
The most frequently used element in Master Pneumatic general purpose filters is rated at 5 μm, so
that nearly all particles larger than 5 μm will be collected in the filter element.
General purpose filters are available in Miniature, Guardsman Modular, Guardsman II Modular,
Vanguard Modular, Vanguard High Capacity, 350 Modular and 380 Modular ranges.
A 0.3-μm-rated coalescing filter element is standard in all coalescing units. They remove 99.99%
of oil and solid contaminants larger than 0.3 μm. An optional 0.01-μm-rated element provides
extremely fine filtration, but at some reduction in air flow. However, in Guardsman II, Series 380 and
Vanguard filters, extended bowls with higher capacity coalescing elements are available, which allow
significantly increased air flows.
Coalescent filters are available in Miniature, Guardsman Modular, Guardsman II Modular, Vanguard
Modular, Vanguard High Capacity, 350 Modular and 380 Modular ranges.
Application note: A general purpose filter must be installed ahead of a coalescing filter to
ensure good performance and to extend the life of the coalescing element.
The adsorbing filters are designed to remove vapours from the air line that cannot be removed by
a coalescing filter. They produce air that is virtually free of oil and hydrocarbons, as required by
industries such as food processing, electronics and instrumentation. The filter cartridges contain
activated carbon to adsorb hydrocarbon vapours and odours from alcohols, esters and ketones. An
optional extended bowl includes a higher capacity adsorbing cartridge, which allows as much as 50
per cent greater airflow.
Series BFC70-E9 adsorbing filters have aluminium bowls and are offered with 1/4, 3/8 or 1/2 ports.
Series FC380-E9 units have either polycarbonate plastic or aluminium bowls and are offered with
3/8, 1/2, or 3/4 ports. An adsorbing filter should always be preceded by a particulate filter and a
coalescing filter. Such an assembly is one of Master Pneumatic’s Clean Air Packages, which will
provide air with no more oil than 10 mg/m3 or 0.008 ppm.
In critical applications when vapour impurities are a potential problem, the installation of a Clean Air Package provides the solution. Ultra clean air is provided by
using the particulate filters as the first line of defence against gross contaminants found in all air lines. Elements remove solid particles larger than 5 micron, while
automatic drains eliminate liquid water and oil emulsions that collect in the sump area. The particulate filter serves as a pre-filter to extend the life of the more
costly coalescing element used for the next stage of filtration.
The coalescing filter element will further clean the air of residual oil mists, aerosols and minute particles, larger than 0.3 micron. A standard differential pressure
gauge warns when the pressure drop exceeds 8 to 10 psi, indicating that the coalescing element should be changed.
Finally, the adsorber filter will provide air, virtually free of oil and most hydrocarbons. It effectively eliminates odours from freons, alcohols, ethers, ketones and up
to 99% of most hydrocarbons in breathing applications. Clean Air Packages are available with port sizes ranging from 1/4 to 3/4.
ULTRA CL AN FILTER AS EMBLIES
These assemblies consist of three filters: a general purpose filter, a coalescing filter and an adsorbing
filter. The general purpose filter removes gross contaminants, while the coalescing filter removes
oil mists, aerosols and minute particles. Finally, the adsorbing filter virtually eliminates odours from
freons, alcohols, esters, ketones and up to 99% of most hydrocarbons.