Edwards nEXT85 - Purge Gas Specification; Water Cooling; Table 41 Purge Gas Specification; Table 42 Water Cooling Block Supply Requirements

• hydrocarbon lubricant
• felt
• rare earth magnets
• silicon nitride
• tanium
• PTFE
Purge gas specicaon
Table 41
Purge gas specicaon
Purge gas specicaon Reference data
Purge gas Dry air, nitrogen, argon or other inert gases
Maximum dew point at atmospheric pressure -22 °C
Maximum size of parculates 1 μm
Maximum concentraon of oil allowable 0.1 parts per million
Purge gas ow (when required) 20 to 50 sccm (0.33 to 0.84 mbar l s
-1
or 33 to
84 Pa l s
-1
)
Recommended purge gas ow 25 sccm (0.42 mbar l s
-1
, 42 Pa l s
-1
)
Maximum allowable purge gas supply
pressure
1 bar (gauge); 14.5 psig, 2 x 10
5
Pa
Water cooling
Table 42
Water cooling block supply requirements
Parameter Specicaon
Quality Mechanically and opcally clean with no
deposits or turbidity
pH Value 6.0 to 8.0
Maximum calcium carbonate concentraon 75 parts per million
Maximum chloride concentraon 100 parts per million
Minimum oxygen concentraon 4 parts per million
Minimum water-cooling ow rate (at 15 °C) 15 l h
-1
Water temperature range 10 °C to 40 °C
Maximum water pressure 5 bar (gauge), 72.5 psig, 5 x 10
5
Pa gauge
Materials exposed to cooling water Nickel plated brass
B8G0-00-880A - Technical Reference
Page 90