To begin with, we present some specific comparative calculations that illustrate the consequences of inadequately prepared (contaminated) compressed air compared to the use of high-quality dry air.

1 m³ of atmospheric air (at a temperature of 20 °C and a pressure of 1 bar) contains approximately 17.3 g of water vapor.

When air is compressed to 7 bar (relative pressure) and not dried, water vapor begins to condense because the dew point temperature rises as the pressure increases. This means:

•    At 7 bar abs. and 20 °C, up to 21.8 ml of water is extracted from 1 m³ of atmospheric air for every 8 m³ of air.

•    On average, a compressor for small-scale production produces approximately 100 m³/h of compressed air, which means ~2730 ml (2.7 liters) of condensate per day – and that's just from moisture, without any additional oil or particles.

If we use an adsorption dryer with a pressure dew point of -40°C, the remaining moisture in the air is less than 0.01 g/m³ – practically dry.

Let's assume:

•    The cost of replacing one pneumatic cylinder due to corrosion or seal damage: 150 €

•    Average service life of a cylinder without air treatment (containing moisture): 1 year

•    with the use of high-quality air treatment: > 5 years

In a typical production line with 50 drives, this means:

•    Without a dryer: Drive replacements every year → 7,500 € in annual costs.

•    With adsorption dryer: Service life > 5 years → 1,500 € every 5 years (with rare failures or preventive replacements).

•    Annual savings: Approximately 6,000 €, not including production downtime.

In laser systems or machines with lenses, even a minimal amount of moisture can cause condensation on the lens or beam interference.

•    Average price of an optical lens for an industrial laser: 300 to 1,000 €

•    Failure due to condensation → often irreparable damage

•    Inadequate air quality → fogging, focus shift, sensor failure.

By using dry air (dew point –40 °C), the moisture content is lower than 0.01 % → safe for optics and non-contact sensors.

The use of a dryer also generates certain costs – a certain amount of energy or compressed air is consumed during the regeneration cycle:

•    A typical cold-regenerated adsorption dryer (heatless) consumes approximately 15 to 20 % of compressed air for regeneration.

•    at 100 m³/h → air consumption ~15 to 20 m³/h;

•    cost of producing 1 m³ of compressed air: 0.01 – 0.03 €;

•    daily regeneration cost: ~3.6 to 14.4 €.

Compared to the damage caused by contamination (breakdowns, equipment replacement, outages), this cost is negligible – especially if a more energy-efficient model is used (e.g., hot regenerated, blower-cooled, water-cooled, etc.).

Central air preparation systems are often located far from the actual point of use. Among other things, the requirements for compressed air quality, which are expressed in accordance with the ISO 8573-1 standard, may also vary depending on the requirements of the machines, so in such cases, central air preparation differs from local preparation. During transport through long pipelines, secondary cooling and subsequent condensate separation can also occur, which reduces air quality despite adequate central preparation. With a local adsorption dryer, however, the compressed air is dried and filtered directly before the consumer, which eliminates the risk of contamination and ensures constant air quality where it matters most.

Compact adsorption dryers, which are based on the principle of physical adsorption of moisture from the air onto the surface of the drying agent (most commonly activated aluminium oxide or molecular sieves), offer numerous advantages:

•    reliable equipment protection – guaranteed low moisture content (pressure dew points down to –40 °C, optionally down to –70 °C) ensures the highest level of air quality and prevents malfunctions;

•    Local installation – units can be installed directly at critical consumption points;

•    Compact design – small dimensions allow installation even in confined spaces (e.g., in machines, device housings, laboratories);

•    Easy integration – dryers can be quickly integrated into existing pneumatic systems.

•    Energy efficiency – models with warm regeneration reduce compressed air consumption.

Local air treatment with compact adsorption dryers is often used in:

•    laser technology – air quality is critical for stable laser operation and protection of optical components (lenses, mirrors);

•    pneumatic drives and valves – moisture causes corrosion, condensation, pressure drop, and failure;

•    analyzers and laboratory equipment – measurement accuracy depends on the removal of moisture and other contaminants from the air;

•    automated assembly lines – prevention of actuator failure and reduction of production downtime;

•    packaging machines – where a clean and dry atmosphere is required (e.g., when packaging pharmaceutical or food products);

•    medical devices and dental equipment – preventing infections and protecting sensitive components.

The quality of compressed air is defined by the ISO 8573-1 standard, which specifies classes for the content of solid particles, moisture, and oil. Contaminated air containing moisture, solid particles, or oil causes:

•    blockages and mechanical damage to pneumatic components;

•    malfunctions of precision instruments and sensors;

•    optical disturbances in lens and camera systems;

•    corrosion inside pipes and equipment;

•    higher maintenance costs and shorter equipment life.

Dry and clean air is therefore an investment in stable production, reduced operating costs, and greater equipment reliability.

At OMEGA AIR d. o. o. Ljubljana, we develop and manufacture compact A-DRY series adsorption dryers, adapted for local use where there are high air quality requirements. With modern design, reliable adsorption technology, and a wide range of models, we provide solutions for every application where high-quality compressed air is essential.