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
Refrigeration dryerABT 130 ABT 130 ABT 130
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
Refrigeration dryerABT 130 ABT 130
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
Refrigeration dryerABT 130 ABT 130 ABT 130
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 i.HOC A CSG 70-2 i.HOC A CSG 90-2 i.HOC 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 i.HOC A CSG 130-2 i.HOC A
Working pressure bar 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 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 -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 i.HOC SFC A CSG 120-2 i.HOC SFC A CSG 130-2 i.HOC SFC A
Working pressure bar 6 8 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 3,23 - 9,45 3,47 - 8,2 4,51 - 12,31 5,08 - 11,2 4,81 - 10 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 -25 -33 -21 -30 -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 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

Add-on refrigeration dryer

ModelABT 130
Power consumption kW 1,38
Pressure dew point °C 3
RefrigerantR-513A
Global warming potential631
Refrigerant volume kg 1,5
Refrigerant mass as CO2 equivalent t 0,9
hermetic refrigeration circuit -

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 i.HOC A DSG 180-2 i.HOC A DSG 220-2 i.HOC 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 i.HOC A DSG 290-2 i.HOC 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 i.HOC SFC A DSG 220-2 i.HOC SFC A DSG 260-2 i.HOC 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 i.HOC 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 3.860 x 2.075 x 2.730 3.860 x 2.075 x 2.730 3.860 x 2.075 x 2.730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 78 78 80
Weight kg 5.550 5.750 5.950

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 3.860 x 2.075 x 2.730 3.860 x 2.075 x 2.730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 81 82
Weight kg 6.250 6.250

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 3.860 x 2.075 x 2.730 3.860 x 2.075 x 2.730 3.860 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 6.550 7.000 7.600

RD version

ModelFSG 300-2 i.HOC A FSG 350-2 i.HOC A FSG 420-2 i.HOC A
Working pressure bar 6 8 6 8 10 6 8 10
Flow rate Complete system at working pressure m³/min 29,4 29,3 37,3 34,9 29,2 45,7 42 37,1
Max. positive pressure bar 8 6 8 10 6 8 10
Nominal motor output kW 160 200 250
Pressure dew point °C -22 -31 -20 -29 -34 -19 -28 -32
Dimensions W x D x H mm 4.630 x 2.075 x 2.730 4.630 x 2.075 x 2.730 4.630 x 2.075 x 2.730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 78 78 80
Weight kg 6.750 6.950 7.150

ModelFSG 450-2 i.HOC A FSG 500-2 i.HOC A
Working pressure bar 8 10 8 10
Flow rate Complete system at working pressure m³/min 45,6 41,9 50 45,6
Max. positive pressure bar 8 10 8 10
Nominal motor output kW 315 315
Pressure dew point °C -27 -31 -26 -30
Dimensions W x D x H mm 4.630 x 2.075 x 2.730 4.630 x 2.075 x 2.730
Compressed air connectionDN125 PN16 DIN DN125 PN16 DIN
Sound pressure level dB(A) 81 82
Weight kg 7.450 7.450

RD SFC version

ModelFSG 420-2 i.HOC SFC A FSG 500-2 i.HOC SFC A FSG 520-2 i.HOC SFC A
Working pressure bar 6 8 10 6 8 10 8 10
Flow rate Complete system at working pressure m³/min 14,79 - 42,18 16,63 - 38,52 18,48 - 34,85 16,94 - 48,66 18,41 - 44,93 19,88 - 41,21 18,4 - 50,63 19,88 - 48,59
Max. positive pressure bar 10 10 10
Nominal motor output kW 250 315 355
Pressure dew point °C -22 -28 -32 -18 -26 -31 -26 -29
Dimensions W x D x H mm 4.630 x 2.075 x 2.730 4.630 x 2.075 x 2.730 4.630 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 7.750 8.200 8.800