Edwards E2M28 Vacuum Pump Dual Stage (Refurbished)

The Edwards E2M28 is a two-stage oil-sealed rotary vane vacuum pump engineered for laboratory and industrial vacuum applications requiring high pumping performance, excellent ultimate vacuum, and long-term operational reliability. Its two-stage compression design provides significantly lower ultimate pressure than single-stage pumps, making it an ideal backing pump for turbomolecular pumps as well as a reliable standalone vacuum source.

Key Features

• Two-stage oil-sealed rotary vane vacuum pump
• High pumping speed with excellent ultimate vacuum
• Ideal backing pump for turbomolecular pumps
• Rugged industrial construction
• Advanced lubrication circuit
• Gas ballast valve for improved water vapor handling
• Forced-air cooling
• Low operating noise
• Oil level and condition sight glass
• Wide-voltage motor
• Integrated IEC electrical connector
• Simple maintenance
• Designed for continuous-duty operation
• Proven long-term reliability

Technical Specifications

Pump Type

• Oil-sealed rotary vane vacuum pump
• Two-stage compression

Performance

• Pumping speed (50 Hz): 27.5 m³/h
• Pumping speed (60 Hz): 33.0 m³/h

Ultimate Vacuum

• Ultimate pressure: 0.1 Pa
• Ultimate pressure with gas ballast: 1.5 Pa

Water Vapor Handling

• Gas ballast valve
• Maximum water vapor pressure: 3000 Pa

Motor

• Rated power (50 Hz): 750 W
• Rated power (60 Hz): 900 W
• Wide-voltage motor

Connections

• Inlet: DN 25 ISO-KF (NW25)
• Outlet: 15 mm hose nozzle

Operating Conditions

• Maximum altitude: 2000 m

Construction

• High-grade cast iron rotor
• High-grade cast iron stator
• Oil capacity: 1.2–1.5 L

Dimensions and Weight

• Dimensions: 626 × 180 × 262 mm
• Weight: 44 kg

Noise Level

• 57 dB(A)

Typical Applications

• Turbomolecular pump backing
• Mass spectrometry
• Electron microscopy
• Vacuum furnaces
• Vacuum drying
• Pharmaceutical manufacturing
• Chemical processing
• Food industry
• Research laboratories
• Industrial vacuum systems