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This Rebuilt Edwards E2M28 Vacuum Pump is an oil‑sealed rotary vane vacuum pump – renowned for their high ultimate vacuum, rapid pumping speed, quiet operation and ability to handle vapor. The Edwards E2M28 pump has become the industry standard for laboratory and light industrial applications. This laboratory vacuum pump is a freestanding unit with the drive provided through a flexible coupling by either a single‑phase or three‑phase (four pole) air cooled motor.

Rebuilt Edwards E2M28 come with a 1-year warranty. Looking for a new pump? See listing here.


The motor is totally enclosed and is cooled by the motor-cooling fan which directs air along the motor fins. The motors are fitted with a thermal overload device. When the motor is too hot, the thermal overload device switches off the pump. The thermal overload device has an automatic reset; when the motor cools down, the device resets and the motor will restart.

An oil pressure system lubricates the pump shaft bearing surfaces and rotor sealing faces. The pump has an oil distribution valve which prevents discharge of oil to the pump interior after the pump stops. The pumping chambers are air-tight, so this arrangement also prevents sucking back in air unless the gas ballast valve is open.

You can inspect the level and condition of oil in the oil box reservoir through the oil sight-glass. An oil filler-plug is fitted to the top of the oil box. The pump has two oil drain-plugs to allow either gravity oil drain or pressure oil drain.

Rebuilt Edwards E2M28 Vacuum Pump Features and Benefits

  • The pump is designed for reliable, long‑term operation
  • Thermal overload device prevents overheating (single phase only)
  • The drive is provided through a flexible coupling by a single‑phase or three‑phase (four pole) motor
  • The motors are totally enclosed and are cooled by the motor cooling fan
  • Full height O ring sealed oil sight glass for easy checking of oil level and condition
  • Large sight glass and operating oil range
  • Comes with a 1-year warranty


  • Analytical instruments – LCMS
  • Automotive
  • Beam lines and high energy physics
  • Centrifuges, ultra-high speed
  • Coating
  • Cryogenics
  • Degassing/curing – oil, epoxy resin
  • Distillation/extraction/filtration
  • Freeze drying
  • Furnaces
  • Gas bottle filling/emptying
  • Gel drying
  • Glove boxes, ovens
  • Laboratory bench top vacuum
  • Lasers, gas recovery and re-circulation
  • Leak detectors, Helium
  • Load locks and transfer chambers
  • Refrigeration manufacture
  • Rotary, centrifugal evaporators
  • Solvent recovery
  • Surface science instruments
  • Turbomolecular backing pumps

Use this resource to help determine the pumping speed you need.


User Manual Data Sheet Infographic 1 Infographic 2

For more documentation, please visit DigiVac’s folder.

Technical Specifications

Displacement (swept volume)
50 Hz 32.2 m3h-1 / 19 ft3min-1
60 Hz 38.9 m3h-1 / 22.3 ft3min-1
Speed (Pneurop 6602)
50 Hz 27.5 m3h-1 / 16.2 ft3min-1
60Hz 33.0 m3h-1 / 19.5 ft3min-1
Ultimate vacuum (total pressure)
without gas ballast 1 x 10-3 mbar / 7.5 x 10-4 Torr
with gas ballast 1.5 x 10-2 mbar / 1.1 x 10-2 Torr
with Fomblin® 1 x 10-2 mbar / 7.5 x 10-3 Torr
Inlet connection NW25 flange
Outlet connection** Nozzle 15 mm external Ø removable from 3/4 in BSP tapped hole
Max allowed pressure at outlet 0.5 bar gauge / 7 psig
Max inlet pressure for water vapour 30 mbar / 23 Torr
Max water vapour pumping rate 0.7 kg h-1
Operating temperature range 13 – 40 °C
Nominal rotation speed 1440 / 1720 rpm
Motor power 50 Hz 0.75 kW
Motor power 60 Hz 0.90 kW
Power Connector 1-ph* IEC EN60320 C19
Weight 44 kg / 97 lbs
Noise 57 dB(A) @ 50 Hz
Oil capacity – max 1.5 litre
Oil capacity – min 1.2 litre
Recommended oil (supplied) Ultragrade 19

* Pumps listed with IEC connector only
** The FX are supplied with NW25 outlet connection

Product Inquiry

Rebuilt Edwards E2M28 pump A37317984 | Digivac
Refurbished Edwards E2M28 Pump, 21 CFM Rotary Vane Vacuum Pump 1 phase 230V | A3735984