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Edwards E2M28 Two Stage Rotary Vane Pump


The EM range of oil‑sealed rotary pumps – renowned for their high ultimate vacuum, rapid pumping speed, quiet operation and ability to handle vapour – have become the industry standard for laboratory and light industrial applications. 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.

Each EM pump is supplied with 1 litre of Ultragrade 19 oil, O ring and centering ring, two Allen keys and spares seal for oil drain and filter plugs. For PFPE prepared FX pumps Fomblin® to be ordered separately.


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.

SKU: EDW-E2M28 Category: Tags: , ,


Technical Data

Displacement (swept volume)
50 Hz32.2 m3h-1 / 19 ft3min-1
60 Hz38.9 m3h-1 / 22.3 ft3min-1
Speed (Pneurop 6602)
50 Hz27.5 m3h-1 / 16.2 ft3min-1
60Hz33.0 m3h-1 / 19.5 ft3min-1
Ultimate vacuum (total pressure)
without gas ballast1 x 10-3 mbar / 7.5 x 10-4 Torr
with gas ballast1.5 x 10-2 mbar / 1.1 x 10-2 Torr
with Fomblin®1 x 10-2 mbar / 7.5 x 10-3 Torr
Inlet connectionNW25 flange
Outlet connection**Nozzle 15 mm external Ø removable from 3/4 in BSP tapped hole
Max allowed pressure at outlet0.5 bar gauge / 7 psig
Max inlet pressure for water vapour30 mbar / 23 Torr
Max water vapour pumping rate0.7 kg h-1
Operating temperature range13 – 40 °C
Nominal rotation speed1440 / 1720 rpm
Motor power 50 Hz0.75 kW
Motor power 60 Hz0.90 kW
Power Connector 1-ph*IEC EN60320 C19
Weight44 kg / 97 lbs
Noise57 dB(A) @ 50 Hz
Oil capacity – max1.5 litre
Oil capacity – min1.2 litre
Recommended oil (supplied)Ultragrade 19

Additional information

Weight97 lbs
Dimensions25 × 10 × 12 in