Edwards E2M28 or E2M30 Rotary Vane Vacuum Pump (used/rebuilt)

All pumps are fully rebuilt and tested to pull around 30-40micron on a cold start. Performance expected to be better after 12 hours warm up.

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.
Motor: 1 Phase 115/220V

All Edward pumps come with 60 days warranty. Degraded performance due to feeding dirt or solvent inside the pump is not covered by the warranty.

Technical Data (when brand new)

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

Technology

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.