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AIXTRON
- Dokumentation
CONFIDENTIAL
15
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System Manual
Use, data
CRIUS II
Installation data
Cooling water quality
The following table lists the requirements for cooling water flowing through cir-
cuits with and without aluminum components.
Tab. 1-3
Water quality
*) cfu = colony forming units
NOTE:
Treat the cooling water with biocide to avoid excessive microbiological
concentration.
Circuit with Al components
Circuit without Al compo-
nents
pH
7.5 … 8.0
7.0 … 8.0
German hardness
< 7.5 °dH
< 7.5 °dH
US hardness
< 0.05 ppm
< 0.05 ppm
Total dissolved solids
1…2 ppm
10 ppm
Oil content
< 1 ppm
< 1 ppm
Micro biologicals
< 10
2
cfu *)
< 10
2
cfu *)
Conductivity at 25 °C
2…25 µS/cm
< 110 µS/cm
Resistivity at 25 °C
40…500 k
Ω
cm
Concentration of inorganic ions
Chloride
< 0.5 ppm
< 10 ppm
Sulfate
< 20 ppm
< 25 ppm
Nitrate
< 0.1 ppm
Cyanide
< 12 ppm
Sodium
< 0.5 ppm
< 0.3 ppm
Calcium
0.6 ppm
0.6 ppm
Magnesium
0.1 ppm
0.1 ppm
Potassium
0.3 ppm
0.3 ppm
Silicate
< 0.1 ppm
< 1.0 ppm
Copper
< 30 ppb
Aluminum
< 1 ppm
Ammonia
< 1.7
×
10
-3
ppm
Oxygen
< 20 ppm
Ozone
< 0.1 ppm