Hydroren supplies products for the dehumidification and purification of hydraulic oils.
The Clean Air Filter is a relatively unknown but innovative and profitable way to reduce maintenance costs by extending the lifetime of oils and components — efficiently drying the oil in a cost-effective way.
Hydraulic systems depend on clean and dry fluids to operate efficiently.
Yet, water and particles are the two most common causes of reduced lifetime for both oil and components.
💧 Water – the Invisible Enemy
Water in hydraulic fluid is a bigger problem than most people realize.
Even small amounts — as little as 200 ppm, equivalent to 40 ml in a 200-liter barrel — can cause serious damage.
Water breaks down oil additives, attacks metal surfaces, reduces the lubrication film, and leads to oxidation, bacterial growth, and reduced filterability.
In short: the fluid loses its properties, and the system’s service life is drastically shortened.
Moreover, oil is hygroscopic – it absorbs moisture from the surrounding air.
Tests show that an oil exposed to 80% relative humidity can increase its water content from 200 ppm to 3000 ppm in one month.
This means that even idle machines can absorb water simply through the tank’s breather air.
⚙️ How the Clean Air Filter Works
When the system is operating, the hydraulic oil tank “breathes” — warm air is expelled and cool air is drawn in.
This incoming air carries both moisture and particles.
The Clean Air Filter is installed in the tank’s breather opening and prevents humid air from entering.
Thanks to its active drying function, the filter lowers the relative humidity of the air before it reaches the oil.
The result is a stable, dry, and clean system environment.
In tests performed by an independent testing institute, the Clean Air Filter was shown to reduce the water content in hydraulic fluid by 2–10 deciliters per square meter of tank surface per week.
The system is available in several versions and can be used for both stationary installations and mobile machinery.
Installation is simple — the filter fits into existing breather holes and can be operated via its own timer control or connected to a central control system.
🔍 Smart Monitoring and Digital Control
The Clean Air Filter can be equipped with a monitoring system that measures:
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Air humidity
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Moisture in hydraulic fluid
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Oil quality
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Particle levels
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Pressure drop across the filter
All data can be displayed in real time and used for predictive maintenance, making it possible to schedule service before problems occur.
🛠️ Why Keeping Hydraulic Fluids Dry Pays Off
Keeping water and particles out of hydraulic fluids is not just about reliability — it’s an investment in lifespan and efficiency.
Studies show that improving oil cleanliness from ISO code 20/17 to 16/13 can nearly double the lifetime of components.
By preventing water ingress, corrosion, wear, and chemical degradation are avoided — resulting in longer service intervals, fewer breakdowns, and lower maintenance costs.
⚡ Summary
The Clean Air Filter combines proven technology with innovative moisture control and digital monitoring.
It’s a simple way to increase reliability, reduce wear, and cut costs — whether for industrial plants, mobile equipment, or lubrication systems.
