Rebuilt Edwards EXT Turbo Pumps

Model	Rebuilt
ETP100/300	ask
EXT70	ask
EXT70H	ask
EXT70CF	ask
EXT250	ask
EXT250H	ask
EXT250HI	ask
EXT250M	ask
EXT255H	ask
EXT255HI	ask
EXT260	ask

Edwards small EXT70 uses a magnetic upper bearing and a ceramic lower bearing. In the EXT250M the rotor is entirely supported by magnetic bearings and can be mounted in any orientation. In the EXT70H the letter H signifies compound molecular: combined bladed turbomolecular stages with molecular drag stages on the same rotor. We also offer repair service.

Specifications	EXT 250M	EXT 255H
Inlet flange	DN100ISO-K or DN100CF
Outlet flange	DN25NW
Pump speed (l/s)
N₂	240	220
He	250	230
H₂	190	180
Compression ratio
N₂	>1 x 10⁸
He	2 x 10⁴	4 x 10⁵
H₂	1,500	1.6 x 10⁴
recommended backing pump	RV5	RV3
Max. continuous inlet pressure (water/air cooling)	3 x 10^-1 / 3 x 10^-2	2 x 10^-1 / 2 x 10^-2
Nominal Rotation speed (rpm)	60,000
Standby rotation (rpm)	42,000
Cooling method	Free convection or forced air, or water	Forced air or water

Digital Manuals

EXT 250 M turbo pump.