50 - 125 hp oil-free rotary screw compressors


Dependable performance – up to +115°F ambient temperature

Two-stage oil-free compression rotary screw compressors from KAESER not only impress with their intelligent component layout, but also with their many innovative details, all of course with the renowned KAESER quality and distinctive, contemporary design. Whether for semiconductor, food, or automotive industries, our two-stage dry-running compressors tirelessly prove that process-appropriate purity and cost-effectiveness truly can go hand-in-hand, even under adverse conditions.

  • Flow rate from 184 to 596 cfm
  • Pressure from 60 to 160 psi
  • Models also available with frequency control drives (SFC)
  • Water-cooled models also available
  • Optional refrigerated dryer or i.HOC dryer available on all CSG models

Your benefits

  • Heat-use made simple:
    Thanks to radial fans with high residual thrust, the heated cooling air can normally be used straight away for space heating without need of auxiliary fans.
  • Energy-efficient in every detail:
    In standby mode, the temperature-controlled Kaeser standstill fan reliably conveys residual heat away – meaning the main fan can be switched off!
  • Exceptionally maintenance-friendly:
    The first and second stages of the aluminum-block heat exchanger can simply be swiveled out for cleaning purposes.
Highlights of our air-cooled CSG series
Water jacket-cooling
Water jacket-cooling for enhanced efficiency.

The effective water jacket-cooling achieves an efficiency increase of several percentage points in comparison to oil jacket-cooling. Moreover, the service life of the gear oil is increased to 18,000 operating hours.

Variable cooling air flow rate
Innovative fan system ensures demand-based cooling-air flow.

Thanks to the innovative fan system, cooling air flow is regulated as needed. This enables optimal adjustment to the corresponding load situation and cooling air temperature.

KAESER SIGMA PROFILE
sigma-profile-airend

At the heart of every CSG system lies a premium-quality airend featuring SIGMA PROFILE rotors. Flow-optimized and robustly constructed, it combines maximum efficiency with sustainable durability.

Coating made by KAESER
PEEK-coating

The rotors and housing on the oil-free compression rotary screw compressor airend are equipped with a special coating developed in-house, which consists of three layers: Nanoceramic, PEEK basecoat, and a top coat. Not only is this exceptionally durable, but also food-safe, as certified by the FDA and EU regulation 1935.

 

CSG oil-free rotary screw compressors in detail

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 steel rotors and jacket cooling
  • Rotors feature durable PEEK coating (ISO 22000)
  • Integrated oil tank with oil tank ventilation
  • Fiber-free pulsation dampeners downstream of both compression stages
  • Vibration monitoring

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
  • Automatic motor bearing lubrication

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

Fiber-free pulse dampers

Fiber-free pulsation dampers

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

Highly efficient condensate separator

High-efficiency condensate separator

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

Easy-care inlet valve

inlet-valve

The pneumatically operated inlet valve is unaffected by contaminants and condensate. Thanks to its robust mechanics, it is reliable and easy to maintain. Service is only required after 18,000 operating hours. The coating is suitable for use in the food and pharmaceuticals industries.

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.
Integrated refrigerated dryer

Even for oil-free rotary screw compressors, refrigerated dryers are the cost-effective choice for delivering the best possible energy efficiency when requiring pressure dew points to 38 °F. Pressure dew points below 38 °F require desiccant dryers.

Integrated i.HOC® drum dryer

The patented i.HOC rotary dryer from Kaeser uses up to 100% of compressor heat! Thanks to full-flow regeneration, it delivers reliable pressure dew points up to an ambient temperature of 115°F – completely without electrical heating or additional cooling of the regeneration air!

  • Installed in air-cooled or water-cooled units
  • Unit rated power from 50 to 450 hp
  • Unit flow rates from 107 to 1790 cfm
  • Integrated SIGMA CONTROL 2 compressor controller
  • Also available with variable speed control and frequency converter (SFC models)
Your advantages

  • Sub-zero pressure dew points even in high ambient temperatures:
    Thanks to its extraordinary regeneration potential, the i.HOC delivers below-zero pressure dew points even with high cooling medium temperatures.
  • Pressure dew point stability even with variable flow rates:
    The pressure dew point remains stable even with low compressor load – no partial-load compensation required.
  • Effective drying AND heat recovery:
    i.HOC uses the heat exchangers of the second compression stage, which have been optimized for heat recovery, as regeneration air coolers.

Benefits of full-flow generation

i.HOC with KAESER full-flow regeneration
□ Full-flow regeneration □ Partial-flow regeneration
↓ Regeneration area: Hot air removes moisture from the desiccant.
↑ Drying area: Moisture is drawn into the desiccant from the cold air.

The i.HOC® (Integrated Heat of Compression Dryer) system uses 100 % of the heat of compression from the second compression stage for drying purposes (full-flow regeneration). This heat is produced and available for use at zero cost.

  • No additional energy input for the drying process
  • Higher regeneration potential than with partial-flow regeneration dryers
  • Full performance, even with low compressor load

The advantages of full-flow regeneration are clear—especially with increased coolant temperatures. Kaeser drum dryers achieve outstanding drying results even without additional heating of the regeneration air.

Technical specifications

Standard version

ModelCSG 60 A CSG 75 A CSG 95 A
Working pressure psi 90 125 160 90 125 160 90 125 160
Flow rate complete system at working pressure acfm 248 211 184 312 270 237 368 327 287
Max. positive pressure psi 90 125 160 90 125 160 90 125 160
Nominal motor output hp 50 60 75
Dimensions
W x D x H in 		87 x 60 x 84 87 x 60 x 84 87 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 70 70 71
Weight lb 5,512 5,622 5,622

ModelCSG 125 A CSG 150 A
Working pressure psi 90 125 160 125 160
Flow rate complete system at working pressure acfm 484 461 427 521 483
Max. positive pressure psi 90 125 160 125 160
Nominal motor output hp 100 125
Dimensions
W x D x H in 		87 x 60 x 84 87 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 72
Weight lb 5,622 6,173

T version

ModelCSG 60 A T CSG 75 A T CSG 95 A T
Working pressure psi 90 125 160 90 125 160 90 125 160
Flow rate complete system at working pressure acfm 248 211 184 311 269 237 368 326 286
Max. positive pressure psi 90 125 160 90 125 160 90 125 160
Nominal motor output hp 50 60 75
Pressure dew point °F 37 37 37
Refrigerated dryerABT 150 ABT 150 ABT 150
Dimensions
W x D x H in 		102 x 60 x 84 102 x 60 x 84 102 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 70 70 71
Weight lb 5,952 6,063 6,063

ModelCSG 125 A T CSG 150 A T
Working pressure psi 90 125 160 125 160
Flow rate complete system at working pressure acfm 483 460 426 520 483
Max. positive pressure psi 90 125 160 125 160
Nominal motor output hp 100 125
Pressure dew point °F 37 37
Refrigerated dryerABT 150 ABT 150
Dimensions
W x D x H in 		102 x 60 x 84 102 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 72
Weight lb 6,063 6,614

SFC version

ModelCSG 75 A SFC CSG 95 A SFC CSG 125 A SFC
Working pressure psi 90 125 90 125 160 90 125 160
Flow rate complete system at working pressure acfm 143 - 311 142 - 268 168 - 346 167 - 334 166 - 302 185 - 511 184 - 464 174 - 415
Max. positive pressure psi 125 125 160 125 160
Nominal motor output hp 75 75 100 100
Dimensions
W x D x H in 		87 x 60 x 84 87 x 60 x 84 87 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 72 72
Weight lb 5,512 5,512 5,622 5,622

ModelCSG 150 A SFC
Working pressure psi 125 160
Flow rate complete system at working pressure acfm 184 - 531 184 - 489
Max. positive pressure psi 160
Nominal motor output hp 125
Dimensions
W x D x H in 		87 x 60 x 84
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 73
Weight lb 5,732

T-SFC version

ModelCSG 75 A SFC T CSG 95 A SFC T CSG 125 A SFC T
Working pressure psi 90 125 90 125 160 90 125 160
Flow rate complete system at working pressure acfm 142 - 310 142 - 267 167 - 345 167 - 333 166 - 301 185 - 506 184 - 462 174 - 413
Max. positive pressure psi 125 125 160 125 160
Nominal motor output hp 75 75 100 100
Pressure dew point °F 37 37 37
Refrigerated dryerABT 150 ABT 150 ABT 150
Dimensions
W x D x H in 		102 x 60 x 84 102 x 60 x 84 102 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 72 72
Weight lb 5,952 5,952 6,063 6,063

ModelCSG 150 A SFC T
Working pressure psi 125 160
Flow rate complete system at working pressure acfm 184 - 529 184 - 487
Max. positive pressure psi 160
Nominal motor output hp 125
Pressure dew point °F 37
Refrigerated dryerABT 150
Dimensions
W x D x H in 		102 x 60 x 84
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 73
Weight lb 6,173

RD version

ModelCSG 60 A i.HOC CSG 75 A i.HOC CSG 95 A i.HOC
Working pressure psi 90 125 160 90 125 160 90 125 160
Flow rate complete system at working pressure acfm 248 211 184 312 270 237 368 327 287
Max. positive pressure psi 90 125 160 90 125 160 90 125 160
Nominal motor output hp 50 60 75
Pressure dew point °F -2 -20 -26 3 -15 -24 3 -13 -22
Dimensions
W x D x H in 		114 x 60 x 84 114 x 60 x 84 114 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 70 70 71
Weight lb 7,055 7,165 7,165

ModelCSG 125 A i.HOC CSG 150 A i.HOC
Working pressure psi 90 125 160 125 160
Flow rate complete system at working pressure acfm 484 461 427 521 483
Max. positive pressure psi 90 125 160 125 160
Nominal motor output hp 100 125
Pressure dew point °F 12 -9 -17 -9 -18
Dimensions
W x D x H in 		114 x 60 x 84 114 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 72
Weight lb 7,165 7,716

RD SFC version

ModelCSG 75 A SFC i.HOC CSG 95 A SFC i.HOC CSG 125 A SFC i.HOC
Working pressure psi 90 125 90 125 160 90 125 160
Flow rate complete system at working pressure acfm 143 - 313 142 - 268 168 - 346 167 - 334 166 - 302 185 - 511 184 - 464 174 - 415
Max. positive pressure psi 125 125 160 125 160
Nominal motor output hp 75 75 100 100
Pressure dew point °F -8 -22 3 -13 -22 9 -9 -20
Dimensions
W x D x H in 		114 x 60 x 84 114 x 60 x 84 114 x 60 x 84
Compressed air connection2½ ANSI class 150 2½ ANSI class 150 2½ ANSI class 150
Sound pressure level dB(A) 71 72 72
Weight lb 7,055 7,055 7,165 7,165

ModelCSG 150 A SFC i.HOC
Working pressure psi 125 160
Flow rate complete system at working pressure acfm 184 - 531 184 - 489
Max. positive pressure psi 160
Nominal motor output hp 125
Pressure dew point °F -9 -20
Dimensions
W x D x H in 		114 x 60 x 84
Compressed air connection2½ ANSI class 150
Sound pressure level dB(A) 73
Weight lb 7,275

Add-on refrigerated dryer

ModelABT 130 ABT 150
Power consumption2.4 1.8
Pressure dew point °F 37 37
RefrigerantR-513A R-513A
Global warming potential — 631 631
Refrigerant volume lb 3.3 2.43
Refrigerant mass as CO2 equivalent t 0.9 0.69
Hermetic refrigeration circuit- -

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