Turbo vacuum pumps: Edwards (formely known as BOC Edwards) turbomolecular vacuum pumps

Edwards vacuum (formerly BOC Edwards) Turbomolecular pumps: Edwards EXT255H compound turbomolecular pump

Edwards (formerly BOC Edwards) Vacuum - Turbo pumps and accessories

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Edwards turbo molecular pumps (turbo vacuum pumps) overview, information and definitions

Our range of EXT turbomolecular and compound molecular pumps and EXC Controllers uses state-of-the-art technology to provide reliable, high and ultra high vacuum.

Edwards EXT255H compound turbomolecular pump

Edwards EXT255H compound turbomolecular molecular pump - Technical data

Inlet flange: DN100ISO-K or DN100CF
Outlet flange: DN25NW
Vent-port: 1/8 inch BSP female
Purge-port: 1/8 inch BSP female
Pumping speed*

Compression ratio

Recommended backing pump**: RV3
Maximum continuous inlet pressure***
water cooling at 15 °C, 40 °C ambient: 5 × 10^-3 mbar
air cooling at 35 °C ambient: 5 × 10^-3 mbar
free convection at 40 °C ambient: 4 × 10^-4 mbar
Nominal rotational speed: 60000 rpm
Standby rotational speed: 42000 rpm
Run-up time to 90% speed

Cooling method: Forced air or water
Maximum inlet flange temperature: 100 °C
Ambient air temperature operating range with forced air cooling: 0-35 °C
Water temperature range (for water cooling): 10-20 °C
Minimum water flow rate (at 15 °C): 15 L h-1
Operating attitude: Vertical and upright, through to horizontal
Noise level at 1 metre: <50 dB(A)
Maximum magnetic field: 5 mT
Recommended Controller

Other compatible Controller: EXC300
Quiescent electrical power: 25 W
nterstage pumping speed (Hi variant)

Inlet flange                                 DN100ISO-K                       DN100CF

Ultimate pressure (mbar)

Rotary vane pump****                <5 × 10^-9                               <5 × 10^-10

Diaphragm pump*****               <5 × 10^-8                                <5 × 10^-9

Weight (kg)                                      5.6                                           8.2

* Pumping speeds are without an inlet screen. Inlet screens are supplied fitted and reduce speed by about 10%.

** A larger backing pump may be required for maximum throughput. A suitable diaphragm backing pump with ultimate <5 mbar may also be used.

*** With backing pressure <0.1 mbar. Above this inlet pressure, rotational speed drops to below nominal.

**** Ultimate pressure 48 hours after bakeout with 2 stage rotary pump.

*****Using a diaphragm pump with ultimate <5 mbar.

Edwards EXT255H compound turbomolecular pump – Pumping speed

EXT 255H turbo pump - pumping speed vs inlet pressure

Edwards EXT255H compound turbomolecular pump – Throughput

EXT 255H turbo pump - Throughput vs inlet pressure

Edwards EXT255H compound turbomolecular pump – Dimensions

A Backing port (outlet flange)

B Purge-port (adaptor shown fitted)

C Electrical supply connector

D Vent-valve

E Cooling-water connector

F Allowance for right-angle cable connector

G Earth bond point

Edwards EXT255H compound turbomolecular molecular pump – Ordering information

Product description                                                                                                       Order No.

Pump                                                         Inlet flange

EXT255H                                                   DN100ISO-K                                                  B75301000

EXT255H                                                   DN100CF                                                       B75302000

EXT255Hi                                                  DN100ISO-K                                                  B75303000

TIC compatible packages* (24 V d.c.)

EXT255H                                                   DN100ISO-K                                                  B75301991

EXT255H                                                   DN100CF                                                       B75302991

EXT255Hi                                                  DN100ISO-K                                                  B75303991

* EXDC 160 (P/N D39646000) or EXDC 80 (P/N D39645000) control module also required. See the TIC Turbo/Instrument controller