Installation
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300855170_002_C4 - 06/2020 - © Leybold
3.6.3 Water Quality
In order to ensure long trouble-free operation the cooling water must not
contain any oils, greases and suspended solids. Moreover, we recommend
compliance with the following limit values:
Appearance
Clear, free of oils and greases
Suspended matter
< 250 mg/l
Particle size
< 150 µm
Electrical conductivity
< 700 µS/cm
pH value
7.0 to 9.0
Total hardness (total alkaline earths)
< 8 °dH
Aggressive carbon dioxide
None, not detectable
Chloride
< 100 mg/l
Sulphates
< 150 mg/l
Nitrate
≤ 50 mg/l
Iron
< 0.2 mg/l
Manganese
< 0.1 mg/l
Ammonium
< 1.0 mg/l
Free chlorine
< 0.2 mg/l
8 °dH (degrees German hardness) = 1.4mmol/l
= 10 °e (degrees English hardness)
= 14 °f (degrees French hardness)
If there is the danger of frost, you may use a water glycol mixture of up to 30 %.
DS water (softened or fully desalinated water) can be used for cooling the pump, if
the pH value corresponds to the range indicated above.
