Edwards EXT Series - Materials Exposed to Gases Pumped

© Edwards Limited 2008. All rights reserved. Page 11
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Technical data
B753-03-880 Issue F
2.6 Materials exposed to gases pumped
The following materials and component types are exposed to the gases pumped: aluminium alloys, stainless steels,
fluoroelastomer and nitrile 'O' rings, hydrocarbon lubricant, felt, rare earth magnets, silicon nitride, phenolic resin
and carbon-fibre reinforced epoxy resin.
Operating attitude Vertical and upright through to horizontal
±2°
Nominal rotational speed 60000 r min
-1
60000 r min
-1
60000 r min
-1
Standby rotational speed 42000 r min
-1
42000 r min
-1
42000 r min
-1
Starting time to 90% speed
EXC100E 190 sec 190 sec 190 sec
EXC120 130 sec 130 sec 130 sec
EXC300 100 sec 100 sec 100 sec
Cooling method Forced-air/
water
Forced-air/
water
Forced-air/
water
Ambient air temperature
(forced-air cooling)
0 - 35 °C 0 - 35 °C 0 - 35 °C
Water temperature
(water-cooling)
10 - 20 °C 10 - 20 °C 10 - 20 °C
Noise level (at 1 metre) < 50 dB(A) < 50 dB(A) < 50 dB(A)
Recommended controller EXC120 EXC120 EXC120
EXC120 maximum VA input 250 VA 250 VA 250 VA with bakeout band
Quiescent power 25W 25W 25W
Recommended backing pump
†††
RV3 RV3 RV3
*
Not supplied - pump supplied with port blanked.
†
Pb = backing pressure, Qi = flow through the interstage-port (EXT255Hi/EXT255HVi only), Qp = flow through
pump-inlet.
‡
Pumping speeds are without inlet-screen or inlet-strainer (EXT255Hi/EXT255HVi only). Inlet-screens and
inlet-strainers reduce speed by approximately 10%.
**
Ultimate pressure 48 hours after bakeout with Pb < 1 x 10
-2
mbar (1 Pa).
††
Ultimate pressure 48 hours after bakeout with Pb < 5 mbar (500 Pa).
‡‡
Inlet pressure has risen to 1 x 10
-3
mbar (1 x 10
-1
Pa).
***
Above this pressure, rotational speed drops below nominal.
†††
A larger backing pump may be required for maximum throughput.
Table 1 - Technical data (continued)
Parameter EXT255H EXT255Hi EXT255HVi Notes