| Technical Data | Sigma 6 | Sigma 8 | Sigma 9 | Sigma 10 |
|---|---|---|---|---|
| Bowl Diameter | 360 mm (14.17″) | 500 mm (19.69″) | 550 mm (21.65″) | 650 mm (25.59″) |
| Bowl Length | 1,800 mm (70.87″) | 2,500 mm (98.43″) | 2,200 mm (86.61″) | 2,565 mm (100.98″) |
| Maximum Bowl Speed | 3,950 RPM | 2,850 RPM | 3,400 RPM | 3,100 RPM |
| Maximum G-Force | 3,139 G | 2,270 G | 3,554 G | 3,491 G |
| Gross Weight | 2,300 kg (5,071 lbs) | 5,100 kg (11,244 lbs) | 5,000 kg (11,023 lbs) | 6,500 kg (14,330 lbs) |
| Overall Length | 4,270 mm (168.11″) | 5,476 mm (215.59″) | 5,722 mm (225.27″) | 6,382 mm (251.25″) |
| Overall Width | 990 mm (38.98″) | 1,140 mm (44.88″) | 1,300 mm (51.18″) | 1,450 mm (57.08″) |
| Overall Height | 1,304 mm (51.34″) | 1,528 mm (60.16″) | 1,963 mm (77.28″) | 2,381 mm (93.74″) |
| Gearbox Size | DD 3.5 kNm | DD 8 kNm | DD 12 kNm | DD 12 kNm |
| Main Motor Power | 22 kW (29.5 HP) | 37 kW (49.6 HP) | 55 kW (73.8 HP) | 75 kW (100.6 HP) |
| Back Drive Motor Power | 11 kW (14.8 HP) | 15 kW (20.1 HP) | 22 kW (29.5 HP) | 37 kW (49.6 HP) |
| Total Installed Power | 33 kW (44.3 HP) | 52 kW (69.7 HP) | 77 kW (103.3 HP) | 112 kW (150.1 HP) |
Alfa Laval Sigma Series Olive Oil Decanter Centrifuges
The Alfa Laval Sigma Series consists of high-performance decanter centrifuges specifically engineered for two-phase olive oil extraction. Designed for both primary and secondary extraction stages (re-milling), Sigma decanters maximize oil recovery while preserving oil quality by preventing temperature increases during the separation process.
Applications
- Two-phase olive oil extraction
- Olive oil clarification
- Oil recovery and extraction
- Dewatering of olive paste
- Small, medium, and large-scale olive oil mills
The Sigma range includes Sigma 6, Sigma 8, Sigma 9, and Sigma 10, covering production requirements from small family-operated olive mills to large industrial processing facilities.
Working Principle
Olive paste enters the decanter through a stationary feed tube and is accelerated by an inlet rotor before entering the rotating bowl. Centrifugal force separates the olive paste into oil and wet solids. The oil migrates toward the liquid phase while solids settle against the bowl wall. A screw conveyor rotating at a differential speed transports solids toward the discharge ports while oil is continuously collected and discharged through dedicated outlets.
Key Benefits
- Maximum olive oil recovery throughout the operating range
- Minimal temperature increase during separation to preserve oil quality
- Low energy consumption with Direct Drive technology
- Automatic differential speed control between bowl and conveyor
- Easy cleaning and maintenance access
- Quiet and reliable operation
- High wear resistance and reduced maintenance costs
- Excellent oil clarification performance
- Remote monitoring and diagnostic capabilities available
Standard Features
- Optimized feed zone for maximum oil extraction
- Special conveyor design for improved solids transport
- Enhanced flight design to minimize turbulence and improve clarification
- Low-heating oil outlet design to protect oil quality
- Wear-resistant feed zone construction
- 360° tungsten carbide solids discharge ports
- Tungsten carbide conveyor protection tiles (optional on Sigma 6)
- Easy replacement of wear parts
- Hinged cover with spring-assisted opening for safe inspection and cleaning
Drive & Automation
- Direct Drive gearbox technology
- Variable Frequency Drive (VFD)
- Automatic differential speed control
- Optional vibration monitoring sensors
- Optional temperature monitoring sensors
- Customizable automation packages
Connectivity Options
- Remote troubleshooting support
- Online machine monitoring
- Real-time operational data access
- Alarm notification system
- Alfa Laval connectivity portal integration
Construction Features
- Compact welded box-frame construction
- Main bearings mounted at both ends
- High-grade stainless steel construction
- Easy-access hinged casing
- Designed for simple maintenance and long service life
