Oil-free compression rotary screw compressor with air-cooling

Reliably robust – even under extreme conditions

In the absence of cooling-water infrastructure, air-cooled oil-free compression rotary screw compressors ensure exceptional compressed air supply reliability – even in ambient temperatures as high as 45 °C.
There’s also plenty of power: thanks to innovative and intelligent system design, air-cooled oil-free compression rotary screw compressors are available up to 355 kW.

  • Flow rates from 3.2 to 50.8 m³/min
  • Robust stainless steel-aluminium cooler combination
  • Also available as a peak-load model with variable-speed control and frequency converter (SFC model versions)
  • Also available with integrated i.HOC rotary dryer (CSG-2 & DSG-2 series)

Your advantages

  • Heat-use made easy:
    Thanks to radial fans with high residual thrust, the heated cooling air can usually be used straight away for interior heating without additional auxiliary fans.
  • Energy-efficient details as standard:
    In standby mode, the temperature-controlled Kaeser standstill fan reliably dissipates residual heat – which means the main fan can be switched off!
  • Exceptionally maintenance-friendly:
    The first and second stages of the aluminium block heat exchanger can simply be pivoted out for cleaning.

Life-cycle costs

Optimal consulting, technically advanced research and development and a global service organisation protect you from system failures.

 

The air-cooled oil-free compression rotary screw compressors in detail

Equipment

Complete package

  • Ready for operation
  • Fully automatic
  • Silenced
  • Vibration-damped
  • Service-friendly design
  • For ambient temperatures up to +45 °C

Airend

  • Two-stage, dry compression rotary screw compressor with precision gearing as per AGMA Q13/DIN- 5
  • 2nd compression stage uses stainless steel rotors and jacket cooling
  • Rotors feature durable coating
  • Integrated oil tank with oil tank ventilation
  • Fibre-free pulse dampers downstream of both compression stages

Drive motor

Super premium efficiency drive motor IE4 logo

  • Internationally renowned SIEMENS manufacture
  • Premium and Super Premium Efficiency Motor
  • Continuous monitoring of motor winding temperature
  • Enclosure protection: IP 55

Cooling

  • Generously dimensioned compressed air aftercooler combinations comprising stainless steel precooler and aluminium cooler
  • Reliable compressor performance up to 45 °C
  • Aluminium cooler for gear oil

Electrical components

  • Control cabinet to IP 54
  • Control cabinet ventilation
  • Automatic star-delta protection combination
  • Control transformer

SIGMA CONTROL 2

SIGMA CONTROL 2 compressor controller

  • Plain text display
  • 30 selectable languages
  • Soft-touch keys with icons
  • Traffic-light LEDs for at-a-glance operational status
  • Fully automatic monitoring and control
  • Dual, Quadro, Vario and Continuous control modes available as standard
  • Interfaces: Ethernet
  • Optional communication modules for Profibus DP, Modbus, Profinet and DeviceNet
  • SD-card slot for data logging and updates
  • RFID reader
  • Web server

Quality in detail

Hydraulic inlet valve

Hydraulic inlet valve

The hydraulically operated inlet valves in Kaeser oil-free compression rotary screw compressors are unaffected by contamination and condensate. This makes them more reliable and easier to maintain than pneumatic valves.

Fibre-free pulse dampers

Fibre-free pulse damper

Kaeser's new fibre-free pulse dampers keep pressure losses to an absolute minimum, help maintain consistent air quality and, unlike fibre versions, do not present a source of contamination for the compressed air.

Reliable oil reservoir venting

Reliable oil reservoir venting

The microfilter in the oil tank venting system prevents the intake of oil-laden air – a key detail to ensure that compressed air quality is reliably maintained at all times.

Highly efficient condensate separator

Highly efficient condensate separator

Thanks to its flow-optimised design, the newly developed condensate separator reliably separates the condensate downstream from the air coolers, with minimal pressure loss.

Options

Bolt-down machine mounts

  • Machine mounts to bolt the machine to the floor

Silencer for air inlet opening

  • Damping louvres in front of heat exchangers

Cooling air filter mats

  • Cooling air filter mats in the inlet area of the compressor
  • Reduce soiling of heat exchanger surfaces and inlet air filters

Hot air connection

  • Direct use of the hot compressed air, e.g. for heat regenerating desiccant dryer or as hot process air
  • With certain models, the desired hot air temperature can be controlled in ranges.

Technical specifications CSG-2 A

Standard version

ModelCSG 55-2 A CSG 70-2 A CSG 90-2 A
Working pressure bar 8 4 6 8 4 6 8 10
Flow rate Complete system at working pressure m³/min 5.4 8.92 7.77 6.65 10.52 9.62 8.8 7.67
Max. positive pressure bar 8 4 6 8 4 6 8 10
Nominal motor output kW 37 45 55
Dimensions W x D x H mm 2,490 x 1,660 x 2,145 2,490 x 1,660 x 2,145 2,490 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 71 71 72
Weight kg 2,270 2,310 2,375

ModelCSG 120-2 A CSG 130-2 A
Working pressure bar 4 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 12.97 12.92 12 10.43 12.92 12.88 12.85
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 75 90
Dimensions W x D x H mm 2,490 x 1,660 x 2,145 2,490 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 73 74
Weight kg 2,515 2,640

T version

ModelCSG 55-2 T A CSG 70-2 T A CSG 90-2 T A
Working pressure bar 8 4 6 8 4 6 8 10
Flow rate Complete system at working pressure m³/min 5.4 8.92 7.77 6.65 10.52 9.62 8.8 7.67
Max. positive pressure bar 8 4 6 8 4 6 8 10
Nominal motor output kW 37 45 55
Pressure dew point °C 3 3 3
Dimensions W x D x H mm 2,840 x 1,660 x 2,145 2,840 x 1,660 x 2,145 2,840 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 71 71 72
Weight kg 2,520 2,560 2,625

ModelCSG 120-2 T A CSG 130-2 T A
Working pressure bar 4 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 12.97 12.92 12 10.43 12.92 12.88 12.85
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 75 90
Pressure dew point °C 3 3
Dimensions W x D x H mm 2,840 x 1,660 x 2,145 2,840 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 73 74
Weight kg 2,765 2,890

SFC version

ModelCSG 90-2 SFC A CSG 120-2 SFC A CSG 130-2 SFC A
Working pressure bar 4 6 8 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 3.32 - 10.62 3.23 - 9.45 3.47 - 8.2 3.94 - 13.23 4.51 - 12.31 5.08 - 11.2 4.81 - 10 4.23 - 13.35 4.64 - 13.26 5.05 - 13.17 5.47 - 12.57
Max. positive pressure bar 6 9 8 10 10
Nominal motor output kW 55 75 90
Dimensions W x D x H mm 2,490 x 1,660 x 2,145 2,490 x 1,660 x 2,145 2,490 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 72 73 74
Weight kg 2,435 2,575 2,700

T-SFC version

ModelCSG 90-2 T SFC A CSG 120-2 T SFC A CSG 130-2 T SFC A
Working pressure bar 4 6 8 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 3.32 - 10.62 3.23 - 9.45 3.47 - 8.2 3.94 - 13.23 4.51 - 12.31 5.08 - 11.2 4.81 - 10 4.23 - 13.35 4.64 - 13.26 5.05 - 13.17 5.47 - 12.57
Max. positive pressure bar 6 9 8 10 10
Nominal motor output kW 55 75 90
Pressure dew point °C 3 3 3
Dimensions W x D x H mm 2,840 x 1,660 x 2,145 2,840 x 1,660 x 2,145 2,840 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 72 73 74
Weight kg 2,685 2,825 2,950

RD version

ModelCSG 55-2 RD A CSG 70-2 RD A CSG 90-2 RD A
Working pressure bar 8 6 8 6 8 10
Flow rate Complete system at working pressure m³/min 5.4 7.77 6.65 9.62 8.8 7.67
Max. positive pressure bar 8 6 8 6 8 10
Nominal motor output kW 37 45 55
Pressure dew point °C -36 -28 -35 -25 -33 -36
Dimensions W x D x H mm 3,140 x 1,660 x 2,145 3,140 x 1,660 x 2,145 3,140 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 71 71 72
Weight kg 2,985 3,025 3,090

ModelCSG 120-2 RD A CSG 130-2 RD A
Working pressure bar 4 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 12.97 12.92 12 10.43 12.92 12.88 12.85
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 75 90
Pressure dew point °C -2 -20 -29 -34 -20 -28 -32
Dimensions W x D x H mm 3,140 x 1,660 x 2,145 3,140 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 73 74
Weight kg 3,230 3,355

RD SFC version

ModelCSG 90-2 RD SFC A CSG 120-2 RD SFC A CSG 130-2 RD SFC A
Working pressure bar 4 6 8 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 3.32 - 10.62 3.23 - 9.45 3.47 - 8.2 3.94 - 13.23 4.51 - 12.31 5.08 - 11.2 4.81 - 10 4.23 - 13.35 4.64 - 13.26 5.05 - 13.17 5.47 - 12.57
Max. positive pressure bar 6 9 8 10 10
Nominal motor output kW 55 75 90
Pressure dew point °C -8 -25 -33 -1 -21 -30 -34 -1 -20 -28 -32
Dimensions W x D x H mm 3,140 x 1,660 x 2,145 3,140 x 1,660 x 2,145 3,140 x 1,660 x 2,145
Compressed air connectionDN65 PN16 DIN DN65 PN16 DIN DN65 PN16 DIN
Sound pressure level dB(A) 72 73 74
Weight kg 3,150 3,290 3,415

Technical specifications DSG-2 A

Standard version

ModelDSG 140-2 A DSG 180-2 A DSG 220-2 A
Working pressure bar 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 21.7 19.2 18.4 16.1 26.15 23 21.6 19.1
Max. positive pressure bar 8 10 4 6 8 10 4 6 8 10
Nominal motor output kW 90 110 132
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 77 78 78
Weight kg 3,400 3,550 3,650

ModelDSG 260-2 A DSG 290-2 A
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 28.61 26.1 26 22.9 28.6 28.55 28.5 26
Max. positive pressure bar 4 8 10 8 10
Nominal motor output kW 160 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 81
Weight kg 3,800 4,000

SFC version

ModelDSG 180-2 SFC A DSG 220-2 SFC A DSG 260-2 SFC A
Working pressure bar 4 6 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.58 - 22.52 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 7.84 - 22.51 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5 8.59 - 27.71 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3
Max. positive pressure bar 6 10 8.5 10 7 10
Nominal motor output kW 110 132 160
Dimensions W x D x H mm 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 79 80
Weight kg 4,150 4,250 4,400

ModelDSG 290-2 SFC A
Working pressure bar 4 6 8 10
Flow rate Complete system at working pressure m³/min 9.07 - 30.09 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 8.5 10
Nominal motor output kW 200
Dimensions W x D x H mm 3,435 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN
Sound pressure level dB(A) 82
Weight kg 4,600

RD version

ModelDSG 140-2 RD A DSG 180-2 RD A DSG 220-2 RD A
Working pressure bar 8 10 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 13.18 13.12 19.2 18.4 16.1 23 21.6 19.1
Max. positive pressure bar 8 10 6 8 10 6 8 10
Nominal motor output kW 90 110 132
Pressure dew point °C -34 -36 -26 -33 -36 -26 -33 -35
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 77 78 78
Weight kg 4,500 4,650 4,750

ModelDSG 260-2 RD A DSG 290-2 RD A
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 26.1 26 22.9 28.55 28.5 26
Max. positive pressure bar 8 10 8 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -32 -34 -24 -31 -33
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 81
Weight kg 4,900 5,100

RD SFC version

ModelDSG 180-2 RD SFC A DSG 220-2 RD SFC A DSG 260-2 RD SFC A
Working pressure bar 6 8 10 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.46 - 20.79 8.51 - 18.56 9.54 - 16.43 8.68 - 22.45 9.51 - 21.8 9.95 - 19.5 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3
Max. positive pressure bar 6 10 8.5 10 7 10
Nominal motor output kW 110 132 160
Pressure dew point °C -26 -33 -36 -26 -32 -35 -25 -31 -34
Dimensions W x D x H mm 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 79 80
Weight kg 5,250 5,350 5,500

ModelDSG 290-2 RD SFC A
Working pressure bar 6 8 10
Flow rate Complete system at working pressure m³/min 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 8.5 10
Nominal motor output kW 200
Pressure dew point °C -24 -30 -33
Dimensions W x D x H mm 4,270 x 1,750 x 2,385
Compressed air connectionDN80 PN16 DIN
Sound pressure level dB(A) 82
Weight kg 5,700

Technical specifications FSG-2 A

Standard version

ModelFSG 300-2 A FSG 350-2 A FSG 420-2 A
Working pressure bar 4 6 8 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 35.12 29.4 29.3 42.15 37.3 34.9 29.2 50.14 45.7 42 37.1
Max. positive pressure bar 4 8 4 6 8 10 4 6 8 10
Nominal motor output kW 160 200 250
Dimensions W x D x H mm 3,525 x 2,075 x 2,730 3,525 x 2,075 x 2,730 3,525 x 2,075 x 2,730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 78 79 80
Weight kg 5,800 6,000 6,250

ModelFSG 450-2 A FSG 500-2 A
Working pressure bar 6 8 10 8 10
Flow rate Complete system at working pressure m³/min 50.1 45.6 41.9 50 45.6
Max. positive pressure bar 6 8 10 8 10
Nominal motor output kW 315 315
Dimensions W x D x H mm 3,525 x 2,075 x 2,730 3,525 x 2,075 x 2,730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 81 82
Weight kg 6,400 6,400

SFC version

ModelFSG 420-2 SFC A FSG 500-2 SFC A FSG 520-2 SFC A
Working pressure bar 4 6 8 10 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 12.95 - 45.84 14.79 - 42.18 16.63 - 38.52 18.48 - 34.85 15.48 - 50.77 16.94 - 48.66 18.41 - 44.93 19.88 - 41.21 15.48 - 50.77 16.94 - 50.7 18.4 - 50.63 19.88 - 48.59
Max. positive pressure bar 10 10 10
Nominal motor output kW 250 315 355
Dimensions W x D x H mm 4,135 x 2,075 x 2,730 4,135 x 2,075 x 2,730 4,135 x 2,075 x 2,730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 81 83 84
Weight kg 7,050 7,200 7,450

Model
Working pressure bar
Flow rate Complete system at working pressure m³/min
Max. positive pressure bar
Nominal motor output kW
Dimensions W x D x H mm
Compressed air connection
Sound pressure level dB(A)
Weight kg