CSG oil-free rotary screw compressors - system rendering

CSG Series Oil-Free Rotary Screw Compressors (50 to 125 hp)

Residual Oil Class 0 per ISO 8573-1

Round-the-clock Efficiency, Low Life-cycle Costs, and Maximum Uptime.

The risk of potential product contamination by the rotary screw compressor is evaluated and minimized by means of HACCP analysis. Our diligence is confirmed compliance for residual oil Class 0 in accordance with ISO 8573-1. CSG compressors are also certified silicone-free, making them ideal for facilities with ISO 22000 Food Safety Management Systems.

Cleanroom & Sensitive Application Air Purity

✓ 100% Oil-Free Guaranteed ✓ Biocompatible Rotor Coating ✓ Silicone-Free

For processes where even a trace amount of oil can compromise product safety, disrupt production, or cause costly recalls, KAESER CSG series compressors deliver uncompromising air quality and deliver 184 to 596 cfm of 100% oil-free air for contamination-sensitive applications, and comprehensive validation support designed to keep your facility compliant with Good Manufacturing Practice (GMP) standards while optimizing energy efficiency.


Food and Beverage Processing Pharmaceutical & BioTech Electronics & High-Tech Manufacturing
Meets strict FDA and hygienic standards for direct product contact, pneumatic conveying, and packaging without risk of flavor alteration or batch contamination Guaranteed ISO 8573-1 Class 0 air purity for active pharmaceutical ingredient (API) manufacturing, tablet coating, and cleanroom air systems. Provides Clean Dry Air (CDA) for the entire electronics manufacturing process, preventing delicate circuit contamination and chemical reactions during semiconductor fabrication, laboratory testing, and automated chemical metering.
Compressed air in food and beverage processing Pharmaceutical compressed air
 
 

Oil-Free Rotary Screw Airend

PEEK & Nanoceramic Biocompatible Rotor Coating

PEEK-coating

Biocompatible Coating Maintains Peak Efficiency for Years

Unlike conventional oil-free airends that lose efficiency as worn coatings flake off over time, KAESER uses a biocompatible, non-wearing coating combination that resists temperatures up to 750°F. This ultra-durable layering ensures consistent volumetric efficiency, zero air contamination, and reduced power consumption across the entire lifespan of the compressor.

oil-free certifications

Audit-Ready Compliance

Kaeser equipment doesn't just meet industry averages; we design systems to meet the world's most stringent purity and efficiency certifications:

  • ISO 8573-1 Class 0: The gold standard for oil-free air purity. 
  • FSMA & SQF: System designs that simplify your safety audits and regulatory compliance. 
  • BCAS: Adhering to best practices for food-grade compressed air.
 
 

Fixed-Speed & SFC Variable Speed Drive (VFD) Options

Match Compressed Air Supply to Fluctuating Demand

Select between standard fixed-speed models or CSG-SFC variable speed drive models. Utilizing Siemens frequency converters, CSG-SFC units automatically adjust motor speed to match real-time air demand—eliminating costly idling time and reducing overall energy expenditure by up to 30%.

 
 

Complete System Integration with SIGMA CONTROL

SIGMA CONTROL 3L

The SIGMA CONTROL continuously tracks operating metrics, predicts maintenance needs, and integrates with factory management systems or the SIGMA AIR MANAGER 4.0 master controller. 

  • Standard Anybus Interface: It connects to your PLC or SCADA network via interchangeable communication modules. 
  • Supported Protocols: Modbus TCP, PROFIBUS DP, PROFINET IO, EtherNet/IP, BACnet/IP, and OPC UA.

Choose from Air-Cooled or Water-Cooled Designs

Air Cooled

air-cooled CSG oil-free compressor

Dependable Performance even under extreme conditions

Generously sized compressed air aftercooler with stainless steel precooler and aluminum cooler

Water jacket-cooling for enhanced efficiency.

Water Jacket-Cooling for Extended Gear Oil Life

Innovative water jacket-cooling design increases compression efficiency 2% and also reduces gearbox oil temperatures to extend gear oil life by 50% (to 18,000 operating hours).

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

Variable Cooling Air Flow Rate

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.

high ambient temperatures

Air-Cooled Operation in High Ambient Temperatures (up to 115°F)

Air-cooled CSG compressors operate dependably in ambient temperatures up to 115°F, thanks to their energy-efficient radial fan. This ensures dependable performance even under extreme conditions.

Water Cooled

parallel flow in water-cooled CSG oil-free screw compressors

Parallel flow

Flow through all coolers in CSG oil-free compressors is implemented in parallel to assure optimal operating temperatures. The same respective inlet temperature ensures significantly increased overall efficiency.

Water regulating valves for efficient and sustainable cooling water use.

Optimum cooling water flow

Water-cooled CSG compressors are equipped with water regulating valves downstream from each heat exchanger. This way, each consumer receives the optimal amount of water, resulting in an economical and more sustainable use of cooling water. During standby mode, when the compressor does not require cooling, the water flow is stopped and waste is avoided.

CSG Series Specifications: 50 to 125 hp Performance Data

Model Motor Power  (hp) Capacity at 125 psig (acfm)(AC) Capacity at 160 psig (acfm)(AC) Dimensions - W x D X H (in) (AC) Sound Level (dB(A) (AC)
CSG 60 50 214 186 86 3/4 x 60 1/4 x 83 5/8

T: 101 1/2 x 60 1/4 x 83 5/8

 i.HOC 114 1/8 x 60 1/4 x 83 5/8		 70
CSG 75 60 273 240 70
CSG 95 75 331 290 71
CSG 125 100 465 431 71
CSG 150 125 526 488 72
Models available air-cooled or water-cooled (T models only available air-cooled). See product brochure for complete specifications, including water-cooled performance data.
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Tell us your required flow rates and pressure needs. Our compressed air engineers will match you with the right model and configuration.

 

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CSG Series Oil-Free Compressors Technical Specifications (50 to 125 hp): Variable Speed (SFC)

Model Rated Motor Power  (hp) Min / Max Capacity (acfm) at 125 psig (AC) Min / Max Capacity (acfm) at 160 psig (AC) Dimensions - W x D X H (in) (AC) Sound Level (dB(A) (AC)
CSG 75 SFC 75 144 / 272 n/a 86 3/4 x 60 1/4 x 83 3/4

T: 101 1/2 x 60 1/4 x 83 3/4

i.HOC: 114 1/8 x 60 1/4 x 83 3/4		 71
CSG 95 SFC 75 (100 hp for 160 psig unit) 169 / 338 168 / 305 72
CSG 125 SFC 100 186 / 469 176 / 419 72
CSG 150 SFC 125 186 / 536 185 / 494 73
CSG 60 not available with variable speed drive. Models available air-cooled or water-cooled (T models only available air-cooled). See product brochure for complete specifications, including water-cooled performance data.

Frequently Asked Questions about CSG Oil-Free Screw Compressors

What makes Kaeser CSG compressors compliant with ISO Class 0 standards?

Kaeser CSG compressors deliver guaranteed ISO 8573-1 Class 0 oil-free air (third-party test certificates available on request) by utilizing non-wearing PEEK and nanoceramic rotor coatings, a 100% silicone-free air pathway, and an HACCP-evaluated design certified for food and pharmaceutical applications. CSG compressors are also certified silicone-free, making them ideal for facilities with ISO 22000 Food Safety Management Systems.

What is the difference between integrated refrigerated dryers (T models) and Integrated Heat of Compression (i.HOC) dryers?
  • Integrated Refrigerated Dryers (T Models): Utilize a scroll refrigerant compressor and an aluminum heat exchanger to deliver reliable, economical moisture removal with a pressure drop below 1.5 psig for standard industrial applications. 
  • i.HOC Dryers: Designed for applications requiring sub-freezing pressure dew points. The patented i.HOC rotation dryer uses 100% of the heat generated by the second compression stage to regenerate the desiccant drum. This full-flow regeneration method delivers reliable, sub-zero pressure dew points without consuming additional electricity or purge air.
Can air-cooled CSG compressors operate continuously in high-ambient temperature environments?

Yes. Air-cooled CSG models operate dependably in continuous ambient temperatures up to 115°F. This performance is made possible by an energy-efficient, speed-controlled radial fan that automatically regulates cooling airflow based on actual heat load, preventing thermal trips during extreme operating conditions.

How does the CSG series design reduce long-term service costs compared to standard oil-free compressors?
The CSG series incorporates several engineered design improvements to extend service intervals:
Fiber-free pulsation dampers
  • Gear Oil Service Life: Water jacket cooling keeps gearbox temperatures low, extending gear fluid service life to 18,000 operating hours. 
  • Fiber-Free Pulse Dampeners: Utilize a chamber silencer and Venturi nozzle to eliminate particle contamination and eliminate a common maintenance point. 
inlet-valve
  • Pneumatic Inlet Valve: Eliminates hydraulic fluid systems, requiring service only after 18,000 operating hours. 
  • Extended Intervals: Compressor stage and gear fluid service intervals are extended by 50%, while condensate drain maintenance intervals are three times longer.
Siemens motor
  • Single Drive Motor: Unlike some oil-free compressors with two drive motors, KAESER uses a single TEFC premium efficiency drive motor for simplicity and reliability.
  • Motor Condition Monitoring: Motor bearing and winding temperatures are monitored by the SIGMA CONTROL system.
automatic lubrication
Automatic Lubrication: Motor efficiency and reliability are maintained with automatic grease lubrication in response to monitoring by the SIGMA CONTROL system.

Designed for Lower Lifecycle Costs and Maximum Uptime

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.

Recover Up to 96% of Input Energy

Compressors convert electrical energy into heat. KAESER CSG series units offer optional integrated heat recovery systems that capture hot water (up to 194°F) for use in facility heating or boiler feed water—significantly reducing overall facility energy utility bills.

Nationwide Service & Factory-Trained Support

Protect your investment with genuine KAESER OEM parts and routine maintenance plans. Our authorized distribution network provides 24/7 emergency repair, air demand analysis (ADA), and local support across the country.

Contact KAESER For Your Compressed Air Questions

kaeser compressors experts help customers find the right compressor system

Speak with a Kaeser Compressed Air Engineer to calculate system CFM demands or request a site audit.

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