Edwards EXT250 Series, Instruction Manual, Page: 14 / 42

B722-01-880 Issue K
Page 8 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Technical data
2.3 Performance
Table 3 - EXT70 performance data
DN40NW DN50NW DN63CF DN63ISO-K
Pumping speed
*
*
Pumping speeds are without inlet-screen. Inlet-screens are supplied fitted and reduce speed by
approximately 10%.
Nitrogen 52 l s
-1
60 l s
-1
65 l s
-1
65 l s
-1
Helium 53 l s
-1
56 l s
-1
60 l s
-1
60 l s
-1
Hydrogen 46 l s
-1
48 l s
-1
50 l s
-1
50 l s
-1
Compression ration
Nitrogen > 1 x 10
8
> 1 x 10
8
> 1 x 10
8
> 1 x 10
8
Helium 6000 6000 6000 6000
Hydrogen 500 500 500 500
Ultimate pressure
†
†
Ultimate pressure 48 hours after bakeout with 2-stage rotary vane backing-pump.
< 5 x 10
-9
mbar < 5 x 10
-9
mbar < 5 x 10
-10
mbar < 5 x 10
-9
mbar
< 5 x 10
-7
Pa < 5 x 10
-7
Pa < 5 x 10
-8
Pa < 5 x 10
-7
Pa
Maximum continuous inlet pressure
‡
‡
Above this pressure, rotational speed drops below nominal.
Water-cooling at 15
o
C 9 x 10
-1
mbar
9 x 10
1
Pa
9 x 10
-1
mbar
9 x 10
1
Pa
9 x 10
-1
mbar
9 x 10
1
Pa
9 x 10
-1
mbar
9 x 10
1
Pa
Air-cooling at 35
o
C 9 x 10
-2
mbar
9 x 10
0
Pa
9 x 10
-2
mbar
9 x 10
0
Pa
9 x 10
-2
mbar
9 x 10
0
Pa
9 x 10
-2
mbar
9 x 10
0
Pa
Free convection at 35
o
C 9 x 10
-3
mbar
9 x 10
-1
Pa
9 x 10
-3
mbar
9 x 10
-1
Pa
9 x 10
-3
mbar
9 x 10
-1
Pa
9 x 10
-3
mbar
9 x 10
-1
Pa
Nominal rotational speed 90000 r min
-1
90000 r min
-1
90000 r min
-1
90000 r min
-1
Standby rotational speed 63000 r min
-1
63000 r min
-1
63000 r min
-1
63000 r min
-1
Starting time to 90% speed
with EXC120/120E 90 sec 90 sec 90 sec 90 sec
with EXC300 90 sec 90 sec 90 sec 90 sec
Recommended Controller EXC100/120 EXC100/120 EXC100/120 EXC100/120
EXC120/E maximum input 250 VA 250 VA 250 VA 250 VA
EXC120/E normal power 60 VA 60 VA 60 VA 60 VA
Other compatible Controller EXC300 EXC300 EXC300 EXC300
EXC300 maximum input 480 VA 480 VA 480 VA 480 VA
EXC300 normal power 60 VA 60 VA 60 VA 60 VA
Quiescent power consumption 10 W 10 W 10 W 10 W