11 Hydrological data
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Rittal air/water heat exchanger
11
Hydrological data
To avoid system damage and to ensure safe operation,
Rittal GmbH & Co. KG recommends the use of system
water or an additive whose composition does not differ
from that presented in the following summary:
The complete absence of corrosion under experimental
conditions suggests that solutions with a significantly
higher salt content and greater corrosion potential (such
as seawater) can still be tolerated.
Hydrological data
Unit
Limits
pH value
7…8.5
Calcium hardness
°dH
>3 …<8
Free carbonic acid
mg/dm³
8…15
Corresponding carbonic
acid
mg/dm³
8…15
Aggressive carbonic acid
mg/dm³
free
Sulphides
mg/dm³
free
Oxygen
mg/dm³
<10
Chloride ions
mg/dm³
<50
Sulphate ions
mg/dm³
<250
Nitrates and nitrites
mg/dm³
<10
COD
mg/dm³
<7
Ammonia
mg/dm³
<5
Iron
mg/dm³
<0.2
Manganese
mg/dm³
<0.2
Conductivity
μS/cm
<2200
Residue on evaporation
mg/dm³
<500
Potassium perman-
ganate
mg/dm³
<25
Suspended matter
mg/dm³
<5
mg/dm³
>3…<15;
partial current puri-
fication recom-
mended
mg/dm³
>15;
continuous purifi-
cation recom-
mended
Tab. 7:
Hydrological data
