Oil Free Air Compressors: Best Choice for Pure Air
100% Oil-Free Rotary Screw Compressors Fixed & Regulated Speed (RS)
Welcome to the new DX series range of oil-free air compressor from CompAir, with 8 new models available as both fixed and regulated speed versions in the large 200 - 355 kW range, pressure range: 4 to 10 bar, volume flow 11.4 to 53.4 m³/min
When PureAir Technology is High Priority
There’s a lot riding on the quality of your air. The presence of particles, condensate, oil and oil vapor in a compressed air system can lead to downtime, product spoilage and recall, damage to your brand reputation, or worse, harmed consumers and product liability.
What makes our oil free DX screw compressors range unique?
✓ State-of-the-Art Airend
✓ Up to 8% higher flow compared to industry standard
✓ Up to 7% (Fixed Speed) & 5% (Variable Speed) energy reduction
✓ Premium variants with even greater efficiencies
✓ Variable speed models with turndown rates of up to 71%
✓ Wide variety of pre-engineered and customised options
✓ Further savings with optional heat recovery
✓ Free iConn remote monitoring
✓ ASSURE Service Program with different coverage options
Oil-free air compressors—especially 100% oil-free rotary screw compressors (fixed & regulated speed / RS type)—are considered the best solution when air purity, reliability, and continuous operation are critical.
A rotary screw compressor compresses air using two interlocking helical rotors. In an oil-free design, no oil is used in the compression chamber, ensuring completely clean air output.
➡️ These systems are often certified ISO 8573-1 Class 0, meaning zero oil contamination risk—the highest air purity level.
🔷 Why Oil-Free Air Compressors Are the Best Choice for Pure Air
✅ 1. 100% Contamination-Free Air
No oil carryover → no product contamination
Essential for industries like:
Food & beverage
Pharmaceuticals
Electronics
✅ 2. Continuous 24/7 Operation
Rotary screw design allows non-stop duty cycles
Lower operating temperatures improve longevity
✅ 3. Compliance & Safety
Meets strict international standards (Class 0 air)
Eliminates risk of:
Product rejection
Equipment damage
Regulatory issues
✅ 4. Lower Total Cost of Ownership (TCO)
No oil filtration or disposal costs
Reduced maintenance downtime
Energy-efficient designs (especially VSD models)
🔷 Fixed Speed vs Regulated Speed (RS / VSD)
🔹 Fixed Speed Compressors
Run at constant speed
Best for steady air demand
Lower upfront cost
🔹 Regulated Speed (VSD / RS)
Adjust motor speed based on demand
Save up to 30–35% energy in variable loads (industry typical)
Ideal for fluctuating operations
🔷 Typical Technical Range
(Industrial oil-free rotary screw compressors)
Pressure: 3.5 – 13 bar
Flow: 1 – 150 m³/min
Power: 15 kW – 900 kW
🔷 Where Oil-Free Rotary Screw Compressors Are Essential
🏭 Food processing (no oil contamination allowed)
💊 Pharmaceutical production
💻 Semiconductor & electronics
🏥 Hospitals & medical air systems
🍺 Beverage & brewing industries
🔷 Final Takeaway
If your priority is pure, risk-free compressed air, a 100% oil-free rotary screw compressor (RS / VSD) is the best choice.
Choose fixed speed if demand is constant
Choose regulated speed (VSD/RS) for energy savings in variable loads
For industrial use → go with rotary screw Class 0 systems
For small setups → oil-free piston units can be a budget alternative
