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Page 7
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Technical Data
B777-00-880 Issue E
Maximum continuous inlet pressure
(light gas pumping)
**
Forced air cooled, 30 °C ambient
1 x 10
-3
mbar
Forced air cooled, 35 °C ambient
5 x 10
-4
mbar
Water cooling at 15 °C
2 x 10
-3
mbar
Maximum continuous inlet pressure
(argon pumping)
**
Forced air cooled, 30 °C ambient
2 x 10
-4
mbar
Forced air cooled, 35 °C ambient
2 x 10
-4
mbar
Water cooling at 15 °C
1 x 10
-3
mbar
Water cooling while pumping high
concentrations of argon is not
recommended
Maximum continuous backing
pressure (light gas pumping)
**
Forced air cooled, 30 °C ambient
12 mbar
Forced air cooled, 35 °C ambient
7.5 mbar
Water cooling at 15 °C
15 mbar
Maximum continuous backing
pressure (argon)
**
Forced air cooled, 30 °C ambient
5 mbar
Forced air cooled, 35 °C ambient
3.5 mbar
Water cooling at 15 °C
8 mbar
Water cooling while pumping high
concentrations of argon is not
recommended
Operating attitude
Any
Nominal rotational speed
50000 rpm
Start time to 90% speed:
EXC250
< 8 minutes
EXC300
< 8 minutes
EXDC160
< 8 minutes
Cooling method
forced air / water
Ambient air temperature for forced
air cooling
0 °C - 35 °C
Minimum cooling water flow rate
(water at 15 °C)
15 l h
-1
Water temperature
10 °C - 20 °C
Noise level at 1 metre
<60 dBA
Recommended controllers
EXC250, EXC300, EXDC160
Quiescent power consumption
35 W
*
Pumping speeds are without inlet screen or inlet strainer (EXT555Hi)
The coarse and fine inlet screens/strainers reduce the pumping speed by 11% and 17% respectively.
†
Pb = backing pressure
‡
Pumping speed has dropped by 10%
**
Above this pressure the rotational speed of the pump drops below nominal and light gases refer to those
with a rmm <28amu
Table 5 - Technical data (continued)
Parameter
EXT555H
Notes
