Air-cooled oil-free air compressors

Reliable performance—even under extreme conditions

Kaeser's air-cooled oil-free rotary screw air compressors deliver exceptional compressed air supply reliability – even in ambient temperatures as high as 115 °F.

Thanks to an innovative system design, air-cooled models are available all the way up to 450 hp.

Your advantages

  • Heat-recovery made easy:
    Thanks to radial fans with high residual thrust, the heated exhaust air can easily be ducted away and used for heating an adjacent room without additional auxiliary fans.
  • Energy-efficient features:
    In standby mode, the temperature-controlled Kaeser standstill fan reliably dissipates residual heat. This allows the main fan to turn off and cools the package down for quicker service.
  • Exceptionally maintenance-friendly:
    Swing-out coolers make cleaning easy.

Life-cycle costs

Our custom consulting services, award-winning product design, and continual investment in our research and development give you superior quality that's tailored for your needs.

 

Take a closer look at our air-cooled oil-free rotary screw compressors

Equipment

Complete unit

  • Ready for operation
  • Fully automatic
  • Super-soundproofing
  • Vibration-dampened
  • Service-friendly design
  • For ambient temperatures up to 115 °F

Airend

  • Two-stage, oil-free 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
  • Fiber-free pulsation dampeners downstream of both compression stages

Drive motor

Super premium efficiency drive motor IE4 logo
  • Manufactured by SIEMENS
  • Premium and Super Premium Efficiency Motor
  • Continuous motor winding temperature monitoring
  • Enclosure protection: IP 55

Cooling

  • Generously sized compressed air aftercooler with stainless steel precooler and aluminum cooler
  • Reliable compressor performance up to 115 °F
  • Aluminum cooler for gear oil

Electrical components

  • Control cabinet to IP 54
  • Switching cabinet ventilation
  • Automatic wye-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 included 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 hydraulic inlet valves in Kaeser's oil-free rotary screw compressors are unaffected by contamination and condensate. This makes them more reliable and easier to maintain than pneumatic valves.

Fiber-free pulsation dampeners

Fibre-free pulse damper

Kaeser's new fiber-free pulsation dampeners keep pressure losses to an absolute minimum, help maintain consistent air quality and, unlike fiber versions, eliminate the possibility of compressed air contamination.

Reliable oil reservoir venting

Reliable oil reservoir venting

The microfilter in the oil tank venting system prevents the intake of oil-laden air. This ensures compressed air quality is maintained at all times.

Highly efficient condensate separator

Highly efficient condensate separator

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

Options

Bolt-down machine mounts

  • Machine mounts for bolting the unit to the floor

Silencer for air inlet opening

  • Dampening louvers in front of heat exchangers

Cooling air filter mats

  • Cooling air filter mats in the inlet area of the compressor
  • Reduce build-up on 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 psi 90 125 60 90 125 60 90 125 145
Flow rate Complete system at working pressure acfm 247 192 344 298 245 390 342 296 273
Max. positive pressure psi 90 125 60 90 125 60 90 125 145
Nominal motor output hp 50 60 75
Dimensions W x D x H in 98 x 65 x 85 98 x 65 x 85 98 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 73 73 74
Weight lb 5,004 5,093 5,236

ModelCSG 120-2 A CSG 130-2 A
Working pressure psi 60 90 125 145 125 145
Flow rate Complete system at working pressure acfm 461 459 421 420 457 456
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 100 125
Dimensions W x D x H in 98 x 65 x 85 98 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 75 76
Weight lb 5,545 5,820

T version

ModelCSG 55-2 T A CSG 70-2 T A CSG 90-2 T A
Working pressure psi 90 125 60 90 125 60 90 125 145
Flow rate Complete system at working pressure acfm 247 192 344 298 245 390 342 296 273
Max. positive pressure psi 90 125 60 90 125 60 90 125 145
Nominal motor output hp 50 60 75
Pressure dew point °F 37 37 37
Refrigerated dryerABT 130 ABT 130 ABT 130
Dimensions W x D x H in 112 x 65 x 85 112 x 65 x 85 112 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 73 73 74
Weight lb 5,556 5,644 5,787

ModelCSG 120-2 T A CSG 130-2 T A
Working pressure psi 125 145 125 145
Flow rate Complete system at working pressure acfm 421 420 457 456
Max. positive pressure psi 125 145 125 145
Nominal motor output hp 100 125
Pressure dew point °F 37 37
Refrigerated dryerABT 130 ABT 130
Dimensions W x D x H in 112 x 65 x 85 112 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 75 76
Weight lb 6,096 6,371

SFC version

ModelCSG 70-2 SFC A CSG 90-2 SFC A CSG 120-2 SFC A
Working pressure psi 60 90 125 60 90 125 60 90 125 145
Flow rate Complete system at working pressure acfm 99 - 337 111 - 297 126 - 250 117 - 412 114 - 374 126 - 321 141 - 472 161 - 470 147 - 431 170 - 404
Max. positive pressure psi 131 90 131 115 145
Nominal motor output hp 75 75 100
Dimensions W x D x H in 98 x 65 x 85 98 x 65 x 85 98 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 73 75 76
Weight lb 5,203 5,203 5,291

ModelCSG 130-2 SFC A
Working pressure psi 60 90 125 145
Flow rate Complete system at working pressure acfm 150 - 477 165 - 476 183 - 474 193 - 473
Max. positive pressure psi 145
Nominal motor output hp 125
Dimensions W x D x H in 98 x 65 x 85
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 76
Weight lb 5,467

T-SFC version

ModelCSG 70-2 T SFC A CSG 90-2 T SFC A CSG 120-2 T SFC A
Working pressure psi 60 90 125 60 90 125 90 125 145
Flow rate Complete system at working pressure acfm 99 - 337 111 - 297 126 - 250 117 - 412 114 - 374 126 - 321 161 - 470 147 - 431 170 - 404
Max. positive pressure psi 131 90 131 115 145
Nominal motor output hp 75 75 100
Pressure dew point °F 37 37 37
Refrigerated dryer
Dimensions W x D x H in 112 x 65 x 85 112 x 65 x 85 112 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 73 75 76
Weight lb 5,754 5,754 5,842

ModelCSG 130-2 T SFC A
Working pressure psi 90 125 145
Flow rate Complete system at working pressure acfm 165 - 476 183 - 474 193 - 473
Max. positive pressure psi 145
Nominal motor output hp 125
Pressure dew point °F 37
Refrigerated dryer
Dimensions W x D x H in 112 x 65 x 85
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 76
Weight lb 6,019

RD version

ModelCSG 55-2 i.HOC A CSG 70-2 i.HOC A CSG 90-2 i.HOCA
Working pressure psi 90 125 90 125 90 125 145
Flow rate Complete system at working pressure acfm 247 192 298 245 342 296 273
Max. positive pressure psi 90 125 90 125 90 125 145
Nominal motor output hp 50 60 75
Pressure dew point °F -22 -34 -18 -32 -14 -29 -32
Dimensions W x D x H in 124 x 65 x 85 124 x 65 x 85 124 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 73 73 74
Weight lb 6,581 6,669 6,812

ModelCSG 120-2 i.HOC A CSG 130-2 i.HOC A
Working pressure psi 90 125 145 125 145
Flow rate Complete system at working pressure acfm 459 421 420 457 456
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 100 125
Pressure dew point °F -5 -23 -26 -21 -25
Dimensions W x D x H in 124 x 65 x 85 124 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 75 76
Weight lb 7,121 7,397

RD SFC version

ModelCSG 70-2 i.HOC SFC A CSG 90-2 i.HOC SFC A CSG 120-2 i.HOC SFC A
Working pressure psi 90 125 90 125 90 125 145
Flow rate Complete system at working pressure acfm 111 - 297 126 - 250 114 - 374 126 - 321 161 - 470 147 - 431 170 - 404
Max. positive pressure psi 131 90 131 115 145
Nominal motor output hp 75 75 100
Pressure dew point °F -23 -31 -12 -28 -8 -22 -27
Dimensions W x D x H in 124 x 65 x 85 124 x 65 x 85 124 x 65 x 85
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 73 75 76
Weight lb 6,790 6,790 6,878

ModelCSG 130-2 i.HOC SFC A
Working pressure psi 90 125 145
Flow rate Complete system at working pressure acfm 165 - 476 183 - 474 193 - 473
Max. positive pressure psi 145
Nominal motor output hp 125
Pressure dew point °F -11 -20 -24
Dimensions W x D x H in 124 x 65 x 85
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 76
Weight lb 7,055

Add-on refrigerated dryer

ModelABT 130
Power consumption2.4
Pressure dew point °F 37
RefrigerantR 513A
Global warming potential 631
Refrigerant volume lb 3.3
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 psi 90 125 145 60 90 125 145 60 90 125 145
Flow rate Complete system at working pressure acfm 579 576 512 821 692 689 576 910 819 780 689
Max. positive pressure psi 125 145 60 125 145 60 90 125 145
Nominal motor output hp 125 150 175
Dimensions W x D x H in 135 x 69 x 94 135 x 69 x 94 135 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 80 81 81
Weight lb 7,496 7,826 8,047

ModelDSG 260-2 A DSG 290-2 A
Working pressure psi 60 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 966 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Dimensions W x D x H in 135 x 69 x 94 135 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 82 84
Weight lb 8,378 8,818

SFC version

ModelDSG 180-2 SFC A DSG 220-2 SFC A DSG 260-2 SFC A
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate Complete system at working pressure acfm 305 - 795 332 - 761 312 - 665 337 - 615 274 - 823 295 - 821 320 - 773 378 - 737 305 - 967 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Dimensions W x D x H in 135 x 69 x 94 135 x 69 x 94 135 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 81 81 82
Weight lb 9,149 9,370 9,700

ModelDSG 290-2 SFC A
Working pressure psi 60 90 125 145
Flow rate Complete system at working pressure acfm 323 - 1,061 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Dimensions W x D x H in 135 x 69 x 94
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 84
Weight lb 10,141

RD version

ModelDSG 140-2 i.HOC A DSG 180-2 i.HOC A DSG 220-2 i.HOC A
Working pressure psi 90 125 145 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 579 576 512 692 689 576 819 780 689
Max. positive pressure psi 125 145 125 145 90 125 145
Nominal motor output hp 125 150 175
Pressure dew point °F -18 -30 -33 -17 -29 -32 -16 -28 -31
Dimensions W x D x H in 168 x 69 x 94 168 x 69 x 94 168 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 80 81 81
Weight lb 9,921 10,251 10,472

ModelDSG 260-2 i.HOC A DSG 290-2 i.HOC A
Working pressure psi 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 964 908 816 963 961
Max. positive pressure psi 90 125 145 125 145
Nominal motor output hp 200 250
Pressure dew point °F -14 -26 -29 -14 -26 -28
Dimensions W x D x H in 168 x 69 x 94 168 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 82 84
Weight lb 10,803 11,244

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 psi 90 125 145 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 332 - 761 312 - 665 337 - 615 295 - 821 320 - 773 378 - 737 330 - 966 347 - 911 364 - 858
Max. positive pressure psi 100 145 125 145 110 145
Nominal motor output hp 150 175 200
Pressure dew point °F -17 -29 -32 -16 -28 -30 -14 -26 -29
Dimensions W x D x H in 168 x 69 x 94 168 x 69 x 94 168 x 69 x 94
Compressed air connection3 ANSI class 150 3 ANSI class 150 3 ANSI class 150
Sound pressure level dB(A) 81 81 82
Weight lb 11,574 11,795 12,125

ModelDSG 290-2 i.HOC SFC A
Working pressure psi 90 125 145
Flow rate Complete system at working pressure acfm 367 - 1,060 418 - 1,058 447 - 1,057
Max. positive pressure psi 145
Nominal motor output hp 250
Pressure dew point °F -12 -24 -26
Dimensions W x D x H in 168 x 69 x 94
Compressed air connection3 ANSI class 150
Sound pressure level dB(A) 84
Weight lb 12,566

Technical specifications FSG-2 A

Standard version

ModelFSG 300-2 A FSG 350-2 A FSG 420-2 A
Working pressure psi 60 90 125 145 60 90 125 145 60 90 125 145
Flow rate Complete system at working pressure acfm 1,269 1,144 1,006 795 1,391 1,388 1,261 1,148 1,747 1,589 1,501 1,261
Max. positive pressure psi 60 90 125 145 90 125 145 60 90 125 145
Nominal motor output hp 250 300 350
Dimensions W x D x H in 152 x 82 x 108 152 x 82 x 108 152 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 82 82 83
Weight lb 12,236 12,677 13,118

ModelFSG 500-2 A
Working pressure psi 90 125 145
Flow rate Complete system at working pressure acfm 1,772 1,769 1,586
Max. positive pressure psi 125 145
Nominal motor output hp 450
Dimensions W x D x H in 152 x 82 x 108
Compressed air connection6 ANSI class 150
Sound pressure level dB(A) 83
Weight lb 13,779

SFC version

ModelFSG 420-2 SFC A FSG 500-2 SFC A
Working pressure psi 60 90 125 145 60 90 125 145
Flow rate Complete system at working pressure acfm 550 - 1,722 598 - 1,517 608 - 1,422 653 - 1,334 550 - 1,793 604 - 1,790 666 - 1,702 702 - 1,612
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Dimensions W x D x H in 152 x 82 x 108 152 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 83 84
Weight lb 14,440 15,432

RD version

ModelFSG 300-2 i.HOC A FSG 350-2 i.HOC A FSG 420-2 i.HOC A
Working pressure psi 90 125 145 125 145 90 125 145
Flow rate Complete system at working pressure acfm 1,144 1,006 795 1,261 1,148 1,589 1,501 1,261
Max. positive pressure psi 90 125 145 125 145 90 125 145
Nominal motor output hp 250 300 350
Pressure dew point °F -8 -26 -31 -23 -27 -4 -20 -26
Dimensions W x D x H in 182 x 82 x 108 182 x 82 x 108 182 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 82 82 83
Weight lb 14,881 15,322 15,763

ModelFSG 500-2 i.HOC A
Working pressure psi 145
Flow rate Complete system at working pressure acfm 1,586
Max. positive pressure psi 145
Nominal motor output hp 450
Pressure dew point °F -22
Dimensions W x D x H in 182 x 82 x 108
Compressed air connection6 ANSI class 150
Sound pressure level dB(A) 83
Weight lb 16,424

RD SFC version

ModelFSG 420-2 i.HOC SFC A FSG 500-2 i.HOC SFC A
Working pressure psi 90 125 145 90 125 145
Flow rate Complete system at working pressure acfm 598 - 1,517 608 - 1,422 653 - 1,334 604 - 1,790 666 - 1,702 702 - 1,612
Max. positive pressure psi 90 145 145
Nominal motor output hp 350 450
Pressure dew point °F -4 -20 -25 -5 -17 -21
Dimensions W x D x H in 182 x 82 x 108 182 x 82 x 108
Compressed air connection6 ANSI class 150 6 ANSI class 150
Sound pressure level dB(A) 83 84
Weight lb 17,086 18,078