Within the compressed air industry, “microfilter” is the umbrella term for filters that operate in the 0.01 µm range and are mainly used in solid/liquid separation and compressed-air applications. Microfilters thus provide an increase in filtration efficiency compared to pre-filters or coarse upstream filtration solutions. If the medium to be filtered is clean, a microfilter can also be used without a pre-filter.
Microfilters separate oil in the form of droplets, achieving a residual oil content of 0.01 mg /m³ (often simply stated as 3 ppm) in compressed air. The residual oil content is usually indicated in milligrams per cubic meter. It should be noted that oil aerosols can still pass through the filter in the gas phase and may subsequently condense into oil. To achieve technically oil-free compressed air, a multi-stage filter system is required, which must also contain an activated carbon stage with pre-filtration.
Special features of microfiltration
To guarantee the necessary flow rates and avoid costly downtime, it is essential that the microfilters are correctly designed and positioned. It is also advisable to install a bypass line for finer filtration units, since maintenance may be required unexpectedly and critical production processes are typically connected downstream.
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