Oil-free rotary screw compressors, air-cooled

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

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

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

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

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

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

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

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150				2½ ANSI class 150
Sound pressure level dB(A)	75				76
Weight lb	5,545				5,820

T version

Model	CSG 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 dryer	ABT 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 connection	2½ 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

Model	CSG 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 dryer	ABT 130		ABT 130
Dimensions W x D x H in	112 x 65 x 85		112 x 65 x 85
Compressed air connection	2½ ANSI class 150		2½ ANSI class 150
Sound pressure level dB(A)	75		76
Weight lb	6,096		6,371

SFC version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150
Sound pressure level dB(A)	76
Weight lb	5,467

T-SFC version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150
Sound pressure level dB(A)	76
Weight lb	6,019

RD version

Model	CSG 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 connection	2½ 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

Model	CSG 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 connection	2½ ANSI class 150			2½ ANSI class 150
Sound pressure level dB(A)	75			76
Weight lb	7,121			7,397

RD SFC version

Model	CSG 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	-18	-31	-12	-28	-5	-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 connection	2½ 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

Model	CSG 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	-4	-20	-24
Dimensions W x D x H in	124 x 65 x 85
Compressed air connection	2½ ANSI class 150
Sound pressure level dB(A)	76
Weight lb	7,055

Add-on refrigerated dryer

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

Model	DSG 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 connection	3 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

Model	DSG 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 connection	3 ANSI class 150				3 ANSI class 150
Sound pressure level dB(A)	82				84
Weight lb	8,378				8,818

SFC version

Model	DSG 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 connection	3 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

Model	DSG 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 connection	3 ANSI class 150
Sound pressure level dB(A)	84
Weight lb	10,141

RD version

Model	DSG 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 connection	3 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

Model	DSG 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 connection	3 ANSI class 150			3 ANSI class 150
Sound pressure level dB(A)	82			84
Weight lb	10,803			11,244

RD SFC version

Model	DSG 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 connection	3 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

Model	DSG 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 connection	3 ANSI class 150
Sound pressure level dB(A)	84
Weight lb	12,566

Technical specifications FSG-2 A

Standard version

Model	FSG 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 connection	6 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

Model	FSG 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 connection	6 ANSI class 150
Sound pressure level dB(A)	83
Weight lb	13,779

SFC version

Model	FSG 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 connection	6 ANSI class 150				6 ANSI class 150
Sound pressure level dB(A)	83				84
Weight lb	14,440				15,432

RD version

Model	FSG 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 connection	6 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

Model	FSG 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 connection	6 ANSI class 150
Sound pressure level dB(A)	83
Weight lb	16,424

RD SFC version

Model	FSG 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 connection	6 ANSI class 150			6 ANSI class 150
Sound pressure level dB(A)	83			84
Weight lb	17,086			18,078

Air-cooled oil-free rotary screw compressors

Reliable performance—even under extreme conditions

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

Complete unit

Airend

Drive motor

Cooling

Electrical components

SIGMA CONTROL 2

Hydraulic inlet valve

Fiber-free pulsation dampeners

Reliable oil reservoir venting

Highly efficient condensate separator

Bolt-down machine mounts

Silencer for air inlet opening

Cooling air filter mats

Hot air connection

Standard version

T version

SFC version

T-SFC version

RD version

RD SFC version

Add-on refrigerated dryer

Standard version

SFC version

RD version

RD SFC version

Standard version

SFC version

RD version

RD SFC version