Absolute Vacuum present:
Edwards^® vacuum Turbomolecular pumps: Edwards^® EXT556H compound turbomolecular pump

Edwards^® Vacuum - Turbo pumps and accessories

EXT turbomolecular pumps

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EXT accessories

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EXPT combined outfits

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STP magnetically levitated turbomolecular pumps and accessories

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

Edwards^® EXT556H compound turbomolecular pump

Edwards^® EXT556H compound turbomolecular pump - Specification

• High critical backing pressure
• High volume flow rate
• Fast pump down
• Multistage Holweck molecular drag mechanism gives high compression ration for light gases
• Ultimate vacuum <10-10 mbar
• Proven EXT performance and reliability
• Hybrid bearing configuration
• Maintenance free . oil bearing reservoir sealed for life
• Machined monobloc rotor
• DC motor drive

Edwards^® EXT556H compound turbomolecular pump - Technical data

Main inlet flange: DN160ISO-K / DN160CF
Outlet flange: DN25NW
Vent port: 1/8 inch BSP
Purge port: 1/8 inch BSP
Inlet pumping speed*

Compression ratio

Ultimate pressure (CF variant): <10^-10 mbar
Recommended backing pump: RV12
Maximum continuous inlet pressure (N2, He, H2)**

water cooling at 15 °C: 2x10^-3 mbar
Nominal rotational speed: 50000 rpm
Start time to 90% speed

Cooling method: forced air / water
Ambient air temperature for forced air cooling: 0 °C – 35 °C
Recommended cooling water flow rate (water at 15 °C): 15 L h^-1
Water temperature: 10 - 20 °C
Maximum inlet flange temperature: 80 °C
Operating attitude: Vertical and upright, through to horizontal
Noise level at 1 metre: <60 dBA
Maximum magnetic field (standard envelopes)

Maximum magnetic field (martensitic envelopes)

Recommended controllers: EXC250, EXC300
Quiescent power consumption: 35 W

* Measured without inlet screen. Inlet screens are supplied fitted and may reduce speed by up to 20%

** With backing pressure < 0.3 mbar. Above this inlet pressure rotational speed drops.

Edwards^® EXT556H compound turbomolecular pump – Pumping speed

EXT556H turbo pump -  pumping speed vs inlet pressure

Edwards^®EXT556H compound turbomolecular pump – Throughput

EXT556H turbo pump - throughput vs inlet pressure

Edwards^® EXT556H compound turbomolecular pump – Dimensions

A Inlet ISO100

B Inlet ISO160

C Vent port

D Earth stud

E Purge port

F Backing port

G Electrical connector

H Base mount holes (8)/Rubber feet (4)

Edwards^® EXT556H compound turbomolecular pump

Product description                                                                                                             Part No.

                                                                                        Pump Inlet flange

EXT556H ISO160                                                        DN160ISO-K                                     B77751000

EXT556H CF160                                                         DN160CF-K                                      B77752000

EXT556H ISO160 (fine inlet screen)                         DN160ISO-K                                      B77761000

Martensitic envelope

EXT556H ISO160*                                                      DN160ISO-K                                      B77757000

EXT556H CF160*                                                       DN160ISO-K                                      B77758000

* HF pumps have Martensic envelopes for use in high magnetic field environments of up to 50 mT.

Accessories Part No.

For safe and reliable operation, the EXT555H requires one of the following external cooling accessories

ACX555 Air cooling accessory                                                                                             B58053561

WCX555 Water cooling accessory                                                                                       B58067003