Compressors
Oil-free compressors

PureAirCompAir · oil-free compressors

Oil-free compressors for 100% clean air

CompAir PureAir: water-injected screw compressors, two-stage dry screw compressors and the dual-motor Ultima™. Certified to ISO 8573-1 Class 0 and silicone-free – for food, beverages, pharmaceuticals and electronics.

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ISO 8573-1Class 0TÜV

ISO 8573-1, silicone-free: Class 0
Motor power: 15–355kW
Free air delivery (FAD): 0.32–53.4m³/min
Working pressure: 4–10.5bar

Why oil-free

No oil in compression – no risk

Even the smallest drop of oil can spoil a product or damage production equipment. A true oil-free compressor has no oil in the compression chamber, so the air stays clean and needs less filtration.

Legal compliance

Processes that need clean, dry, oil-free air cannot risk contamination. Class 0 gives peace of mind for the system and the business.

Worry-free operation

Oil-laden air damages dryers, filters and sensitive electronics, causing unnecessary downtime and expense.

Less maintenance and energy

Less filtration means a lower pressure drop and lower energy use. No oil separators and no oil removal filters.

A more sustainable system

Clean, oil-free air simplifies air treatment, condensate management and waste disposal.

ISO 8573-1: oil classes

Total oil content (aerosol, liquid, vapour)

Class	mg/m³
Class 0	< 0.01
Class 1	≤ 0.01
Class 2	≤ 0.1
Class 3	≤ 1
Class 4	≤ 5

Class 0 is the most stringent class of ISO 8573-1. CompAir oil-free compressors are certified Class 0 by TÜV.

Range

Five series from 15 to 355 kW

All series are available air- or water-cooled, most of them with fixed or regulated speed (RS). Set your flow and pressure to see which series fits.

Your duty point

Flow10m³/min

0.360

Working pressure8bar(g)

410.5

3 matching series: D37–D75 (RS), Ultima™ U55s–U160, DX90–DX160 (RS)

Flow range by seriesm³/min, log scale

D15H–D37H (RS)

0.32–6.87

D37–D75 (RS)

5.1–12.7

Ultima™ U55s–U160

4.3–23.9

DX90–DX160 (RS)

6.7–28.3

DX200–DX355e (RS)

11.4–53.4

The red line is the selected flow. Series in blue also cover the selected pressure.

CompAir D15H–D37H water-injected oil-free compressor

Water-injected, single-stage

D15H–D37H (RS)

Power: 15–37 kW
Pressure: 5–10 bar(g)
Flow: 0.32–6.87 m³/min

Single-stage water-injected screw, direct drive, no gearbox. Compression below 60 °C.

More about the series →

CompAir D37–D75 two-stage oil-free screw compressor

Dry screw, two-stage

D37–D75 (RS)

Power: 37–75 kW
Pressure: 7–10 bar(g)
Flow: 5.1–12.7 m³/min

Two-stage dry screw with UltraCoat™ protection and a stainless steel second-stage rotor. RS with HPM motor.

More about the series →

New

Two-stage, two motors

Ultima™ U55s–U160

Power: 55–160 kW
Pressure: 4–10 bar(g)
Flow: 4.3–23.9 m³/min

Two dry screw airends, each with its own IE5 PM motor, no gearbox. Up to 13% power savings.

More about the series →

CompAir DX90–DX160 oil-free screw compressor

Dry screw, two-stage

DX90–DX160 (RS)

Power: 90–160 kW
Pressure: 7.5–10.5 bar(g)
Flow: 6.7–28.3 m³/min

Up to 8% higher flow than the industry standard, IE5 motor on RS models, rated for 46 °C ambient.

More about the series →

CompAir DX200–DX355 oil-free screw compressor

Dry screw, two-stage

DX200–DX355e (RS)

Power: 200–355 kW
Pressure: 4–10 bar(g)
Flow: 11.4–53.4 m³/min

The largest series, built for continuous duty. Water-cooled “e” variants for extra savings.

More about the series →

Data: CompAir brochures PureAir (08/25), DH (09/23), DX (11/24) and Ultima (07/25). FAD to ISO 1217, Ed. 4, Annex C and E.

Technologies

Three routes to oil-free air

CompAir offers all common oil-free technologies, and some you will not find anywhere else. The best choice depends on power, demand profile and heat recovery.

CompAir DH water-injected oil-free compressor

Single-stage screw

Water lubricates, cools and seals

Purified water from a reverse osmosis system lubricates, cools and seals the compression process. The temperature stays below 60 °C, so compression is near-isothermal and no aftercooler is needed.

Direct drive with no gearbox and no belts
Sealed-for-life bearings, no oil anywhere in the compressor
Balanced bearing loads – element life up to 36,000 hours
Regulated speed (RS) for 0.32–6.87 m³/min

Series: D15H–D37H (RS)

DH compared

Less is more

DH has far fewer moving parts than a traditional two-stage oil-free compressor, so there is less to go wrong.

No oil, oil separator or oil pump
No gearbox and no oil removal filters
No aftercooler and no complex seal arrangements

	CompAir DH	Traditional 2-stage
Oil	No	Yes
Speed	up to 3,500 rpm	6,000–25,000 rpm
Compression temperature	60 °C	up to 200 °C
Compression elements	1	2
Gears	0	5–7
Bearings	7	more than 15
Seals	2	more than 15

Source: CompAir DH brochure (09/23).

Ultima™

Next-generation oil-free efficiency

Ultima is a patented oil-free compressor with two dry screw airends, each driven by a variable-speed IE5 permanent magnet motor. With energy being the largest lifecycle cost, every percent counts.

up to 13%: power savings versus traditional oil-free technology
−45%: idle-run energy versus conventional two-stage compressors
< 8 kW: in idle run for a 160 kW Ultima
−34%: footprint versus its predecessor, up to 50% less than competitors
69 dB(A): 160 kW water-cooled (70 dB(A) air-cooled)
90 °C: hot water from heat recovery

Traditional oil-free compressor

A single motor
A gearbox drives both airends
Friction losses in the gearbox

Ultima™

Two IE5 PM motors, no gearbox
Each stage runs at its own speed
Optimal pressure ratio in real time

More about Ultima

−25%

Einbecker Brewery

Two new 110 kW Ultima compressors in a very tight space cut energy costs by 25%.

We needed a new solution to improve efficiency and reduce energy costs, and it had to fit the very tight installation space.

+13%

Schwan Cosmetics

At a 17,000 m² production site, a 160 kW unit was replaced by Ultima: 13% higher efficiency and 100% sterile production.

When we made the decision to invest in a new compressor to replace the previous 160 kW device, we wanted to take a step forwards.

Fresenius Kabi

In Friedberg, a new Ultima and adsorption dryer system replaced a costly rental compressor. Key reasons: Ultima's cooling and the dryer design.

If the positive results we are achieving continue, this package of compressor and dryers will continue to be a positive addition to our business.

Heat recovery

You have already paid for the heat – use it

Around 94% of the energy used by a compressor turns into heat. Without heat recovery, fans blow it into the atmosphere. Every Ultima can produce hot water up to 90 °C.

Space heating

Industrial process heat

Hot water

Pre-heating for steam

Integrated heat recovery – a heat exchanger inside the compressor package, factory-fitted or as a retrofit kit.
Air-cooled Ultima – the only air-cooled oil-free compressor with integrated heat recovery, no cooling water needed.
Water-cooled Ultima + E-max – a turnkey box with all main components, simple to install and virtually maintenance-free.

Air-cooled Ultima with integrated heat recovery

Piston compressor or Ultima?

An Ultima U90 replaces an R100 piston compressor without major construction work. Heat recovery example – R180 T piston vs. Ultima U110 at 23 m³/min and 4,000 operating hours a year:

	Piston R180 T	Ultima U110
Cooling capacity (kW)	110	109
Temperature difference in/out (K)	25	40
Water flow (m³/h)	3.96	2.81
Usable heat power (kW)	44	109
Usable heat (kWh/year)	176,000	437,500
Saving from heat recovery (€/year)	12,320	30,625

+261,500 kWhmore heat per year+18,305 €saved per year

Heat energy cost €0.07/kWh. Source: CompAir, “Proven piston compressors vs. new Ultima™ technology”. Up to 50% less cooling water.

Regulated speed (RS)

Energy is 82% of the cost

Over five years, energy typically accounts for about 80% of a compressor's total cost. An RS compressor with an IES2 drive system (EN 61800-9) delivers only as much air as you use.

Typical fixed-speed compressor

82 %10 %8 %

Energy
Investment
Service and maintenance

CompAir RS compressor

48 %12 %5 %−35 %

Energy
Investment
Service and maintenance
Saving

up to 35%: energy saving with regulated speed
7%: more power for every bar above the required pressure
71%: turndown on DX90–160 RS models
IE5: HRM motor on DX90–160 RS, instant stop at minimum speed

Source: CompAir DX (11/24) and DH (09/23) brochures.

Control and connectivity

In control – from anywhere

CompAir controllers show the compressor status in real time, and iConn sends the data to the cloud for predictive maintenance.

Delcos XL SE7

Ultima (DH: Delcos XL)

7" touch screen (1024 × 600), trend graphs, RS-485, Modbus RTU, Profibus, integrated web server, SD card and embedded iConn.

Delcos i 10

DX90–DX160

Graphical trending and optional energy monitoring with consumption, cost and efficiency data. RS models sequence up to four compressors without extra hardware.

iConn

Standard

Real-time monitoring and predictive analysis of historic data. Free on new compressors, can be retrofitted.

Ecoplant

Continuously monitors and adjusts compressor operation, cutting costs by up to 20% and lowering CO₂ emissions.

SmartAir Master

Up to 12 compressors

Coordinates fixed and RS compressors and downstream equipment, narrows the pressure band and equalises running hours.

Assure

Service agreement

Factory-trained technicians, genuine parts and an extended warranty depending on the agreement duration.

CompAir compressed air treatment equipment

AirPlus

Single-source air treatment

An oil-free compressor is only the start. CompAir dryers, filters and drains keep the air quality all the way to the point of use.

New sub-freezing dryer: −20 °C pressure dew point (Class 3), up to 70% lower costs than desiccant dryers
Heat-of-compression (HOC) and drum dryers for the lowest dew points
Filters, activated carbon towers and zero-loss condensate drains
Low pressure drop EPL piping