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 unit

  • 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
  • Switching 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 options
  • 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
Working pressure bar 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
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 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
Compressed air connectionDN80 PN16 DIN DN80 PN16 DIN
Sound pressure level dB(A) 79 79
Weight kg 4,150 4,250

ModelDSG 260-2 SFC A DSG 290-2 SFC A
Working pressure bar 4 6 8 10 4 6 8 10
Flow rate Complete system at working pressure m³/min 8.59 - 27.71 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 9.07 - 30.09 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 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) 80 82
Weight kg 4,400 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
Working pressure bar 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
Max. positive pressure bar 6 10 8.5 10
Nominal motor output kW 110 132
Pressure dew point °C -26 -33 -36 -26 -32 -35
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 79
Weight kg 5,250 5,350

ModelDSG 260-2 RD SFC A DSG 290-2 RD SFC A
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 9.36 - 27.66 9.62 - 25.44 10.3 - 23.3 10.27 - 30.05 11.47 - 30 12.33 - 28
Max. positive pressure bar 7 10 8.5 10
Nominal motor output kW 160 200
Pressure dew point °C -25 -31 -34 -24 -30 -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) 80 82
Weight kg 5,500 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
Working pressure bar 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
Max. positive pressure bar 10 10
Nominal motor output kW 250 315
Dimensions W x D x H mm 4,135 x 2,075 x 2,730 4,135 x 2,075 x 2,730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 81 83
Weight kg 7,050 7,200

ModelFSG 520-2 SFC A
Working pressure bar 4 6 8 10
Flow rate Complete system at working pressure m³/min 15.48 - 50.77 16.94 - 50.7 18.4 - 50.63 19.88 - 48.59
Max. positive pressure bar 10
Nominal motor output kW 355
Dimensions W x D x H mm 4,135 x 2,075 x 2,730
Compressed air connectionDN125 PN16 DIN
Sound pressure level dB(A) 84
Weight kg 7,450