© Edwards Limited 2008. All rights reserved. Page 13
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Technical data
B722-20-880 Issue D
Minimum backing pump
displacement
0.6 m
3
h
-1
0.6 m
3
h
-1
Maximum continuous inlet
pressure:
***
Nitrogen:
water-cooling (water at
15 °C, ambient 40°C)
***
5 x 10
-3
mbar
5 x 10
-1
Pa
5 x 10
-3
mbar
5 x 10
-1
Pa
air-cooling at 35 °C
***
5 x 10
-3
mbar
5 x 10
-1
Pa
5 x 10
-3
mbar
5 x 10
-1
Pa
Argon:
water-cooling (water at
15 °C, ambient 40°C)
***
3 x 10
-3
mbar
3 x 10
-1
Pa
3 x 10
-3
mbar
3 x 10
-1
Pa
air-cooling at 35 °C
***
2 x 10
-3
mbar
2 x 10
-1
Pa
2 x 10
-3
mbar
2 x 10
-1
Pa
Operating attitude Vertical and upright through to horizontal ± 2°
Nominal rotational speed 60000 r min
-1
60000 r min
-1
Compatible drive modules: EXDC160 24V, EXDC80 24V
Maximum power input:
EXDC80 24 V 93 W
EXDC160 24 V 187 W
Starting time to 90% speed
(EXDC160 24 V drive module)
< 180 s < 180 s
Cooling method forced air / water forced air / water
Ambient air temperature
(forced air cooling)
0-35 °C 0-35 °C
Water temperature (water
cooling)
10-20 °C 10-20 °C
Noise level at 1 meter 50dB(A)
Recommended backing pump
†††
RV3 RV3
*
Not supplied - pump supplied with port blanked.
†
Pb = backing pressure, Qi = flow through the interstage-port (EXT255Hi only), Qp = flow through pump-inlet.
‡
Pumping speeds are without inlet-screen or inlet-strainer (EXT255Hi only). Inlet-screens and inlet-strainers
reduce speed by approximately 10%.
**
Ultimate pressure 48 hours after bakeout with Pb
<
10
-2
mbar (1 Pa).
††
Ultimate pressure 48 hours after bakeout with Pb
<
5 mbar (500Pa).
‡‡
Inlet pressure has risen to 1 x 10
-3
mbar (1 x 10
-1
Pa).
***
Above this pressure, rotational speed drops below nominal due to thermal limitation of pump and / or
control module.
†††
A larger backing pump may be required for maximum throughput.
Table 2 - EXT255H 24 V / EXT255Hi 24 V technical data (continued)
Parameter EXT255H 24V EXT255Hi 24V Notes
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