1. Sigma Rotary Screw Compressors
3 to 30 hp

2. Kaeser rotary screw belt drive models
Product Range
Sizes from 3 hp to 30 hp
Flows from 9 to 124 cfm
Standard pressures* , 160 and 217 psig
Special pressures available
Special application modifications available
Kaeser rotary screw belt drive models
*Pressures above 160 psig not available in 3 hp models

3. Airend The heart of a Kaeser compressor:
All components manufactured by Kaeser
Strict quality control standards and testing ensure optimum performance
Sigma Profile airend

4. Airend Rotor Milling Process
Airend Rotor Finishing
Precision ground rotor finish:
Creates less fluid friction and shear
Helps increase energy efficiency
Airend Rotor Milling Process

5. The Sigma Profile Advantage
Kaeser proprietary design
5:6 unequal bore rotor combination and closer tolerances reduce back-flow
Rounded edges reduce fluid friction and shear
More cfm per input kW!
Kaeser's Sigma Profile

6. Kaeser Mechanical Shaft Seal Components
Airend Mechanical Shaft Seal
No maintenance, high quality mechanical shaft seal:
Designed and manufactured exclusively by Kaeser
Strict quality control measures ensure optimum performance
Kaeser Mechanical Shaft Seal Components

7. Drive Motor Premium efficiency means less input power
Meets or exceeds EISA requirements
TEFC protection against dust and dirt
Class F insulation
Drive Motor

8. Single ribbed v-belt and pulley
Belt Drive
Quiet and dependable
Easy to align
Allows pressure and flow changes in the field
Reduces footprint
Motor/airend protection
Single ribbed v-belt and pulley

9. Automatic belt tension visual indicator
Automatic Belt Tensioner
Maintains proper tension
Maximizes efficiency
Prevents over-tensioning
Prolongs belt life
Easily adjustable with visual indicator
Automatic belt tension visual indicator

10. New Style V-Belt New elastic belt design on SX and Airtower™ models
Alignment notches indicate proper belt tension
New elastic belt design on SX and Airtower™ models
No re-tensioning required after installation
New belt tension indicator

11. Premium quality inlet filter
Heavy Duty Inlet Air Filter
Premium quality 1 micron filter protects:
Airend
Oil cooler
Valves
Oil separator
Reduces maintenance
Increases service-life (reduced wear)
Maximum efficiency
Premium quality inlet filter

12. Normally closed piston style inlet valve interior view
Normally Closed Inlet Valve*
Energy efficient unloaded starts help increase motor life
Fast acting check function prevents back-flow at shut- down
Large diameter valve plate minimizes:
Flow restrictions
Wear on moving parts
Tight seal
Heavy duty spring
Vent
Normally closed piston style inlet valve interior view
*Inlet valve shown does not represent Airtower™ models

13. Minimum pressure check valve for SX and Airtower™ models
Ensures sufficient pressure to circulate oil during idle
Eliminates need for oil pump
Prevents venting system pressure when compressor idles or is off
Minimum pressure check valve for SX and Airtower™ models

14. SM series separator tank
ASME certified tank
Reservoir for compressor lubricant
Separates oil from airstream
Includes:
Safety relief valve
Pressure gauge
Quick disconnect fittings
Lubricant level indicator
SM series separator tank

15. Spin-on separator cartridge
Oil filter
New design on SX and Airtower™ models
Mounted with several other components on combination block to save space
1-3 ppm oil carry-over

16. Strategically located vibration isolators
Vibration Isolation
Strategically located vibration isolators:
Reduce stress on pipe connections
Lessen stress on motor and drive system
Help minimize overall package noise levels
Strategically located vibration isolators

17. Airtower™ piping connections
Pipe Connections
Pipes made of steel and feature flexible connections
Fittings sealed with special compound for extra leak protection
Airtower™ piping connections

18. Thermostatically controlled combination valve
Thermostatically Controlled Lubricant Circuit
Helps prevent internal condensation which:
Increases equipment service-life
Eradicates moisture related maintenance and repair requirements
Thermostatically controlled combination valve

19. Fluid cooler represents 80% of cooler area
Maintains optimal operating temperature
Thermostatically controlled
Quick disconnect fitting and ball valve allow complete fluid change
Air-cooled
Fluid cooler represents 80% of cooler area

20. Aftercooler represents 20% of cooler area
Approach temperature range between 10.8°F and 18°F
Condenses 50-80% of moisture from the compressed air stream
Air-cooled
*No aftercooler on Airtower™ models
Aftercooler represents 20% of cooler area

21. Cabinet cooling air intake Motor cooling air intake
Dual Flow Cooling Fan
Featured on SX, SM, SK and AS models
Cast as single piece to ensure:
Perfect balance
Low vibration
Quiet operation
Mounted on non-drive end of motor for optimal cooling effect
Dual-flow fan isolates multiple cooling air intake paths with single fan
Cabinet cooling air intake
Motor cooling air intake

22. Rugged construction, sleek appearance
Full Steel Enclosure*
Durable powder-coated finish
Thick soundproofing for very low noise levels
Locking doors and panels for safety
Enclosure gaskets and pre-filter for protection from dirt and dust
Heavy-gauge steel frame and floor
Rugged construction, sleek appearance
*Except Airtower™ models

23. Cover easily removed for access to components
Single Piece Molded Cover
Exclusive to Airtower™ models
Light-weight, durable roto-molded polyethylene material resists scratches and dents
Cover easily removed for access to components

24. Sigma Control Basic™ PLC controller
Sigma Control BasicTM
Standard on SX, SM, SK, AS and Airtower™ models
Simple and reliable interface
Password protected
Displays:
Discharge pressure
Discharge temperature
Load and service hours
Fault indications
Sigma Control Basic™ PLC controller

25. Sigma ControlTM and Sigma Control 2™
Optional on SX, SM, SK* and AS models
Provides detailed operating and maintenance information
Alarms and message history aid troubleshooting
Programmable timer and alternate pressure setting for operating schedule and two unit sequencing
Multi-level password protection
Sigma Control™
*Sigma Control 2™ initially available on SK model only
Sigma Control 2™

26. Sigma ControlTM and Sigma Control 2™
Multiple analog and digital I/O ports for remote start / stop and additional sensors
User friendly touch pad with LCD panel
Multiple languages
Industrial microprocessor
Certified EMI (Electro Magnetic Interference) protection
Sigma Control™
Sigma Control 2™

27. Easy to read display and RFID reader
Sigma Control 2™
Initially only available as an option on SK models
Will be integrated as an option on all belt drive models in coming months
Easy to read display and RFID reader

28. Wye-Delta Start Lower in-rush current; lower peak demand charges
Reduces bearing loads
Standard on 4 hp* through 30 hp models
* Direct on-line starting on SX 3 and single- phase models

29. Airtower™ 5C featuring start / stop control
Exclusive to Airtower™ models
Unit only runs when air is needed
Shuts off immediately upon reaching set pressure

30. SFC 8 with Siemens AG MICROMASTER Drive
SFC Option
SFC 8 - SFC 18S
Matches power to demand
Near unity power factor
Siemens AG MICROMASTER Drive MM 420 used in SFC 8 and SFC 18S models
Siemens Sinamics Drive G used in SFC 11 and SFC 15
SFC 8 with Siemens AG MICROMASTER Drive

31. AS 25 T showing built-in integral refrigerated dryer
Integral Dryer Option
Available on all belt drive models
Dryer sized to match compressor capacity*
Controller operates compressor and dryer
Single-point hook-up simplifies installation
Stainless-steel, plate type heat exchanger
Integral dryer
AS 25 T showing built-in integral refrigerated dryer
*When operating at rated conditions

32. AirCenter™ Simplex with AS 25 T
Compressor - Dryer Combinations
AirCenter™ Simplex with AS 25 T
SK 15 AirCenter™

33. SK AirCenter™ with optional Sigma Control 2™
AirCenter™ Simplex and Duplex Series
Sigma screw compressor(s)
Refrigerated air dryer
ASME coded receiver tank including
Air pressure safety relief valve
Pressure gauge
Manual drain valve
Heavy duty steel frame
Duplex packages include sequencing capabilities
SM AirCenter™ Simplex
SK AirCenter™ with optional Sigma Control 2™
AS AirCenter™ Duplex

34. Warranty and Parts Guarantees
Two-year warranty on airend, motor and Sigma ControlTM
24-hour emergency parts shipping guarantee for the first 5 years
Optional five-year warranty available