Edwards nEXT 240D User Manual

B800-00-880 Issue D
Page 10 © Edwards Limited 2013. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Technical data
Note: Concentrations of gases may be modified by the compression of the pump.
The pumps are designed to pump the following residual gases normally used in high-vacuum systems:
The pump can be used to pump oxygen and water vapour, subject to the following conditions:
 Oxygen – when the pump is purged by an inert gas, oxygen can be pumped at concentrations above 20% by
volume. Refer to Section 2.4 for Purge gas specification. However, if the pump is not purged, the oxygen
concentration must be less than 20% by volume.
 Water vapour - ensure that vapour does not condense inside the pump; refer to Section 3.10.3.
If pumping a gas not listed above, contact the supplier for advice. If the supplier is not contacted, the pump warranty
may be invalidated. The pump is not suitable for pumping aggressive or corrosive gases.
WARNING
Do not expose any part of the human body to vacuum.
WARNING
Do not use a nEXT pump to pump mercury vapour and do not allow mercury (for example, from a
McLeod gauge) to come into contact with the pump. If mercury vapour is pumped, the pump rotor
may corrode and fail.
 Air  Carbon dioxide
 Methane  Neon
 Propane  Krypton
 Butane  Helium
 Carbon monoxide  Ethane
 Nitrogen  Argon
 Hydrogen
Table 3 - nEXT 240 pumps technical data
Parameter
nEXT240D
ISO100
nEXT240D
CF100
nEXT240T
ISO100
nEXT240T
CF100
Mass 5.7 kg 8.8 kg 6 kg 9.1 kg
Inlet flange DN100ISO-K DN100CF DN100ISO-K DN100CF
Outlet flange DN25NW DN25NW DN25NW DN25NW
Vent port
⅛ inch BSPP ⅛ inch BSPP ⅛ inch BSPP ⅛ inch BSPP
Purge port
⅛ inch BSPP ⅛ inch BSPP ⅛ inch BSPP ⅛ inch BSPP
Interstage port DN25NW DN25NW DN25NW DN25NW
Booster port DN25NW DN25NW DN25NW DN25NW
Inlet pumping speed
N
2
He
H
2
240 l/s
230 l/s
165 l/s
240 l/s
230 l/s
165 l/s
240 l/s
230 l/s
165 l/s
240 l/s
230 l/s
165 l/s
Inlet compression ratio
N
2
He
H
2
>1 x 10
11
3 x 10
5
1 x 10
4
>1 x 10
11
3 x 10
5
1 x 10
4
>1 x 10
11
1 x 10
6
1.5 x 10
4
>1 x 10
11
1 x 10
6
1.5 x 10
4

Edwards nEXT 240D Specifications

General

Brand	Edwards
Model	nEXT 240D
Category	Water Pump
Language	English