Oil-free rotary screw air compressors from 25 to 125 hp

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 563 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

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

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

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

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

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

SIGMA CONTROL 2

Quality in detail

Fiber-free pulse 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

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

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.

Technical specifications

Standard version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150			2½ ANSI class 150
Sound pressure level dB(A)	71			72
Weight lb	5,622			6,173

T version

Model	CSG 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 dryer	ABT 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 connection	2½ 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

Model	CSG 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 dryer	ABT 150			ABT 150
Dimensions W x D x H in	102 x 60 x 84			102 x 60 x 84
Compressed air connection	2½ ANSI class 150			2½ ANSI class 150
Sound pressure level dB(A)	71			72
Weight lb	6,063			6,614

SFC version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150
Sound pressure level dB(A)	73
Weight lb	5,732

T-SFC version

Model	CSG 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 dryer	ABT 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 connection	2½ 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

Model	CSG 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 dryer	ABT 150
Dimensions W x D x H in	102 x 60 x 84
Compressed air connection	2½ ANSI class 150
Sound pressure level dB(A)	73
Weight lb	6,173

RD version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150			2½ ANSI class 150
Sound pressure level dB(A)	71			72
Weight lb	7,165			7,716

RD SFC version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150
Sound pressure level dB(A)	73
Weight lb	7,275

Add-on refrigerated dryer

Model	ABT 130	ABT 150
Power consumption	2.4	1.8
Pressure dew point °F	37	37
Refrigerant	R-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	-	-