Compressed air filters

Compressed air filters are used to remove contaminants from compressed air. The quality of the compressed air depends on the application. According to ISO 8573-1, there are six quality classes, and with each level, the cost of producing air increases.

Compressed air contamination
In order to be cost-effective, compressed air system must meet, but not exceed, the level required by your application. Therefore, it is extremely important to specify the filter element purification level.

Filtration basics
To efficiently remove impurities, it is essential to have good compressed air filters, which consist of filter housing and filter element. Filter element is the one that is designated to remove most solid and liquid contaminants from the compressed air. Filter elements use two types of filtration: surface and depth filtration.

What kind of filtration my system needs?
compressed air filtersModern production companies need expensive and complex production equipment to meet the demands of the modern market. Equipment and machines which are powered by compressed air are worth nothing, if the quality of compressed air is poor. Downtime and unreliability are not acceptable. 

Compressed air contamination is a real problem, which cannot be ignored. Even the most simple and basic use of compressed air requires a minimum treatment, including the elimination of water, oil and solids. To guarantee maximum performance and reliability, clean, dry, reliable compressed air supply is essential to maintain efficient and cost-effective production. The key factor in planning an efficient compressed air system is to know all sources and types of compressed air contaminants and the required maximum levels of certain contaminants.

Contaminants come to compressed air system from different sources:
- Atmospheric air, containing water vapour, dust, oil vapours and microorganisms.
- Air compressor generates oil contaminants in liquid, aerosol and vapour phase.
- Air receivers (pressure vessels) and distribution systems generates corrosion and scales.

filtration rates enPre-filters for general purpose (B, P and R) 
Pre-filter elements are designed for efficient removal of coarse solid particles and bulk liquids from compressed air. This type of filter is generally used as a pre-filter for the coalescing filter. They are required by non-lubricated and lubricated compressors.

Oil removal filters (M and S)
Coalescing filter elements are used for a highly efficient removal of solid particles, oil aerosols and water from compressed air. Oil removal compressed air filters are usually made of special coalescence material based on glass fibers. These materials enable the formation of oil drops, which are forced to the outside of the filter by air flow. When it reaches the exterior of the filter material, it is stopped in a porous foam material, which covers the filter element, and then runs down to the bottom of the filter housing. The oil is discharged by the automatic condensate drain.

Activated carbon compressed air filters (A and A2)
Activated carbon filters are required in applications, where the air is required for breathing; mixing with food, pharmaceutical products or other similar applications. Activated carbon filter elements are designed for highly efficient removal of oil, hydrocarbons, vapours and odours from compressed air. Activated carbon is an excellent adsorbent for oil vapours and a medium suitable for the purification of compressed air. It must be in fine granulated form to generate a large surface on which the adsorption can occur. It is essential that the coalescing filter element is installed as a pre-filter upstream to the activated carbon filter. 

Catalyst compressed air filters (H2)
Catalyst or two stage filter elements are used for a highly efficient reduction of carbon monoxide as well as some other substances from compressed breathing air. In the first stage the Hopcalite catalyst reduces the level of these substances from the air and in the second stage the depth fiber filter media intercepts all Hopcalite dust particles. It is essential that coalescing filter element is installed as a pre-filter to the Catalyst grade filter and that relative humidity is sufficiently low. 

Molecular sieve compressed air filters (MS2)
A molecular sieve is a material with pores (very small holes) of uniform size. These pores match the dimensions of small molecules, thereby preventing the adsorption of large molecules and only allowing the passage of smaller molecules.
Molecular sieve filter elements are used for separating water vapor from small flows of compressed air and therefore for air drying. In the first stage, the desiccant adsorbs water vapor from the air and in the second stage the depth fiber filter media intercepts all dust particles. The molecular sieve filtration grade is suitable for point of use applications. It is important that inlet air is free of liquid water and oil aerosols.

Sterile compressed air filters
Sterile compressed air filters eliminate micro-organisms from compressed air and they are used in processes and systems which require the highest air quality. Sterilised compressed air filters are made of materials that enable high temperature steam sterilization.
filter elements basics


I would like to send an inquiry and I accept the Privacy policy.

Omega Air d.o.o. Ljubljana
Cesta Dolomitskega odreda 10
1000 Ljubljana
+386 (0)1 200 68 00
+386 (0)1 200 68 50