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The DH series contains absolutely no oil anywhere in the compressor and has been certified ISO 8573-1 Class Zero (2010) and silicone free.

The unique design achieves lower speeds combined with lower operating temperatures – both resulting in high efficiency and reduced component wear. Using a single-stage, direct-driven motor without gears or belts, maximises efficiency. Limiting the compressed air to the application demand with regulated speed ensures that no energy is wasted.


Single-stage, direct-driven compression element maximises efficiency and minimises maintenance
High quality water injection lubricates, cools and seals the compression process, maximising efficiency
No gearbox means no need for associated oil lubrication
Low bearing loads and low speeds mean sealed-for-life bearings can be used, requiring no oil lubrication
Regulated speed technology available to reduce energy costs
Comprehensive control ensures safe and reliable operation and includes remote communication capability
Fully packaged and silenced enclosure reduces noise and simplifies installation

DH compressors have significantly fewer moving parts than comparable machines, meaning there is less to go wrong, while lower speeds and balanced bearing loads extend the compression element service life for low-cost operation.

With exceptionally low running temperatures of less than 60°C near isothermal compression is achieved. This also eliminates the need of an internal aftercooler and associates power consumption reducing pressure drop to the minimum.

The compression loads are balanced resulting in low bearing loads and highest reliability:

The tried and tested reverse osmosis filtration provides high quality purified water to lubricate, seal and cool the compression process. Using a permeate pump the water required is reduced to a minimum.

The multilingual Delcos XL control system ensures reliable operation and protects your investment by continuously monitoring the operational parameters, which is essential for reducing cost of ownership.

Precise monitoring for exceptional operational reliability
Ambient pressure and temperature
Inlet and outlet pressure and temperature at both stages
Network pressure and temperature
Oil / water pressure and temperature
Oil / water level
… and many more
High resolution, easy-to-use touch-screen panel
User-friendly clear menu structure
Integrated SD card for in-depth analysis of monitored machine parameters
Trend diagrams for
Network pressure
Motor speed (regulated speed models)
On load hours / total running hours and average volume flow
Weekly average volume flow
Optional base load sequencing

Product Literature