Oil Free Air Compressors: Best Choice for Pure Air
Two Stage Oil Free Rotary Screw Compressors DS – Series
CompAir has extended its Oil Free rotary screw compressor range with the new DS37-DS150 fixed and variable speed series.
What it is:
Class Zero Oil FREE Rotary Screw Compressor
Nominal Power from 37-150 kW
Capacity of up to 25.9 m³/min (@ 7 bar g)
Complementing the established 160 to 315 kW model range
Fixed Speed and Variable Speed (RS) Models
Air-cooled
Numerous Further Options
We are pleased to announce the launch of new oil-free rotary screw compressor models, complementing the established CompAir D-Series range and delivering reliability, dynamic efficiency, lower operating costs, and high-quality oil-free compressed air.
The new models are:
Class Zero Oil Free Rotary Screw Compressor
Nominal Power from 37-150 kW
Capacity of up to 25.9m3/min (@ 7 bar g)
Complementing the established 160 to 315kW model range
Fixed Speed and Variable Speed models
Air cooled
Numerous Further Options
The range covers air-cooled models from 37 to 150 kW and is available in both fixed and variable speeds delivering ISO 8573-1:2010 Class 0 certified 100% oil-free air for the most critical applications, e.g. within the food and beverage, pharmaceutical, textile, and electronics industries.
Highest productivity
Oil Free Class 0 certified air delivered for the most demanding industries
Intuitive Controller with extensive events history and advanced connectivity
The DS Series range from CompAir is able to withstand the harshest environments and 46°C maximum ambient temperature, reducing unplanned shutdowns caused by high heat, and increasing productivity.
Optimum efficiency
The range features a robust airend with precision machined gears, oversized bearings, stainless steel air seals, and unique labyrinth oil seal design to eliminate the risk of internal leaks.
Hot Air Discharge option for lowest pressure dew points without additional energy consumption via HOC dryer
Maximum reliability
Patented Ultracoat™ treatment of rotors and internalparts of compression chamber to avoid corrosion
Stainless Steel robust piping design on the cold side
Efficient inlet air filter for the best care of the air compressed path
IP65 electrical fittings and control panel
Value added services
Easy access to main components
No special tools required
8000 hours coolant change interval
Free iConn inside. A smart, proactive real-time online monitoring service that allows operators to manage the performance of the system through invaluable data statistics and insights, iConn will alert users should a potential issue with the compressed air system arise.
Service and warranty programs
Oil-free air compressors are widely considered the best choice when air purity is critical—not just a preference, but a requirement in industries like food processing, pharmaceuticals, electronics, and textiles. Even tiny traces of oil can contaminate products, damage equipment, or violate quality standards.
Why oil-free compressors matter
Oil-free systems deliver 100% clean compressed air (ISO Class 0), meaning no oil is present anywhere in the compression process. This eliminates the risk of contamination and reduces the need for downstream filtration.
They are especially important when compressed air:
Comes into direct contact with products (e.g., food, medicine)
Is used in sensitive manufacturing processes
Must meet strict regulatory standards
CompAir DS Series (DS37–DS150): Key Overview
The CompAir DS Series (DS37–DS150) is a modern range of two-stage oil-free rotary screw compressors designed for industrial applications requiring high efficiency and purity.
Core specifications
Power range: 37 to 150 kW
Air capacity: up to 25.9 m³/min (at 7 bar)
Configurations: Fixed speed and variable speed (RS models)
Cooling: Air-cooled
Certification: ISO 8573-1 Class 0 (oil-free air)
What makes the DS Series stand out
1. Guaranteed pure air (Class 0)
These compressors provide certified oil-free air, making them suitable for the most demanding environments where contamination is unacceptable.
2. High efficiency & lower operating costs
Advanced two-stage compression design
Optional variable speed drive (VSD) to match demand and save energy
Reduced pressure losses and optimized airflow
This translates into lower energy consumption and total cost of ownership.
3. Strong reliability in harsh conditions
Designed to operate in ambient temperatures up to 46°C
Durable components like stainless steel air seals and piping
Special coatings (e.g., Ultracoat) to prevent corrosion
4. Smart control & monitoring
Modern controller with real-time data tracking
Remote monitoring via integrated systems (like iConn)
Helps predict maintenance and avoid downtime
5. Easy maintenance & service
Long service intervals (e.g., coolant changes up to 8000 hours)
Accessible design with minimal tools required
Typical applications
The DS37–DS
