Edwards E2M28 21 CFM Dual-Stage High Capacity Vacuum Pump


Categories: , SKU: E2M28


Brand new Edwards E2M28 high capacity vacuum pump with one year manufacturer warranty from Edwards. E2M28 replaces the discontinued E2M30, click links below for more details. Technical support and one year warranty, covered by Edwards.


The EM range of oil-sealed rotary pumps – renowned for its high ultimate vacuum, rapid pumping speed, quiet operation and ability to handle vapour – has become the industry standard laboratory and light industrial applications. The E2M28 pump is a two-stage, direct drive, sliding vane pump. The pump is oil sealed and designed for reliable, long-term operation in both laboratory and industrial environments. The pump is a freestanding unit with the drive provided through a flexible coupling by either a single-phase or three-phase (four-pole) motor. 

Supplied with: Ultragrade 19 oil, NW25 O-ring and centering ring, lifting plate. Fomblin® must be purchased separately for PFPE pumps.


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 (suckback) after the pump stops. The pumping chambers are air-tight, so this arrangement prevents oil suckback 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.

Features and Benefits

  • The pump is designed for reliable, long-term operation.
  • Thermal overload device prevents overheating (single phase only).
  • The pump is a free-standing unit.
  • 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.
  • Easy to use controls.
  • Pressure die cast oil box with integral oil seals prevents oil leaks.
  • Gas ballast valve for large water vapour handling capacity.
  • Externally approved to EN61010, CSA, C22.2 and UL61010 standards
  • Oil distribution valve.
  • Pumping chambers are air-tight.
  • Oil sight-glass, two oil drain-plugs, inlet-port and outlet nozzle all fitted as standard.
  • One year warranty, as well as technical support from Edwards.


  • 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



 Model  E2M28 (replacing the old E2M30)
 Vacuum pump type  Dual stage rotary vane
 Power  110V 50/60Hz 1-PH 8.2A or 220V 50/60Hz 1-PH 4.1A (switchable)
 Power connection  US standard 3-prong plug (NEMA 5-15P)
 Motor power at 50Hz  750 watts
 Motor power at 60Hz  900 watts
 Peak pumping speed  21 CFM at 60Hz
 Ultimate vacuum without gas ballast  0.75 micron/millitorr
 Ultimate vacuum with gas ballast  11 micron/millitorr
 Unit dimensions (WxDxH)  23 x 6.75 x 11″
 Shipping dimensions (WxDxH)  31 x 11.5 x 19″
 Max water vapor inlet pressure  22.5 torr (30 mbar)
 Max allowed pressure at outlet  0.5 bar gauge/7 psig
 Max water vapor capacity  700 grams/hour
 Operating temperature range  54°F to 104°F (12°C to 40°C)
 Oil capacity  Minimum 1.4 quart (1.3 L), maximum 1.6 quart (1.5 L)
 Oil type  Ultragrade 19
 Nominal rotation speed  1400/1720 rpm
 Noise level  57 dB(A)
 Inlet connection  NW25/KF25
 Outlet connection  Nozzle 15mm external removable from 3/4 in BSP tapped hole
 Unit weight  100 Lbs
 Shipping weight  120 Lbs
 Certification  CE, UL

Additional information

Weight 120 lbs
Dimensions 32 × 16 × 20 in


There are no reviews yet.

Be the first to review “Edwards E2M28 21 CFM Dual-Stage High Capacity Vacuum Pump”

Need more information? Fill out the information below.

[contact-form-7 id=”18751″ title=”Contact Us Page”]