B722-01-880 Issue K
Page 12 © Edwards Limited 2007. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Technical data
2.6 Purge gas specification (for EXT250 only)
2.7 Cooling-water
The following cooling-water specification corresponds to a typical high-quality drinking water specification. Check
with your water supply authority if you are in doubt about the quality of your supply.
Table 6 - Purge gas data
Purge gas Dry nitrogen, argon or other inert gases
Maximum dew point at atmospheric pressure -22
o
C
Maximum size of particulates 1 μm
Maximum concentration of oil 0.1 parts per million
Allowable purge gas flow (when required) 20 to 100 sccm (0.33 to 1.67 mbar l s
-1
,
33 to 167 Pa l s
-1
)
Recommended purge gas flow 25 sccm (0.42 mbar l s
-1
, 42 Pa l s
-1
)
Maximum allowable purge gas supply pressure 2 bar gauge. 29 psig, 3 x 10
5
Pa
Table 7 - Cooling-water data
Quality Mechanically clean and optically clear with no
deposits or turbidity
pH value 6.0 to 8.0
Maximum calcium carbonate concentration 75 parts per million
Maximum chloride concentration 100 parts per million
Maximum oxygen concentration 4 parts per million
Minimum water-cooling flow rate (at 15
o
C) 15 l h
-1
Water temperature 10 to 20
o
C
Maximum water pressure 5 bar gauge, 72 psig, 6 x 10
5
Pa
To Next Page
Loading...
Need help?
General
