In case water is not in line with recommended values or if any doubt, please refer to Atlas Copco.
Technical specifications
Parameter Unit Single Pass
(65°C /
149°F)
Single Pass
(95°C /
203°F)
Recirculating
(65°C / 149°F)
Closed
System
(65°C /
149°F)
Closed
System
(95°C /
203°F)
1 pH 6.8 - 9.3 6.8 - 9.3 6.8 - 9.3 7.5 - 9.3 7.5 - 9.3
2 Conductivity µS / cm < 1500 < 600 < 4000 < 1500 50 - 600
3 Total Dissolved
Solids
mg / L TDS to be measured for calculating RSI.
4 Ca-hardness ppm
CaCO
3
< 500 < 2 < 500 < 1000 < 50
5 Total Alkalinity ppm
CaCO
3
No limits indicated. To be measured for calculating RSI.
6 Ryznar Stability
Index (RSI)
5.6 - 7.5 N.A. 5.6 - 7.5 5.6 - 7.5 5.6 - 7.5
7 Chlorine ppm < 0.5 — < 0.5 — —
8 Chlorides ppm < 500 (*) < 100 < 500 (*) < 500 (*) < 100
9 Nitrates ppm No limits indicated. To be measured for calculating RSI.
10 Sulphates ppm < 1000 < 200 < 1000 < 400 < 200
11 Chemical
Corrosion Index
< 5 < 1 < 5 < 1 < 1
12 Iron ppm < 1 < 0.2 < 1 < 1 < 0.2
13 Manganese ppm < 0.2 < 0.05 < 0.2 < 0.2 < 0.05
14 Copper ppm < 1 < 0.2 < 1 < 1 < 0.2
15 Ammonium ppm < 0.5 < 0.5 < 0.5 < 0.5 < 0.5
16 Suspended
Solids (max
10µ)
ppm < 10 < 1 < 10 < 10 < 1
17 Oil or Grease ppm < 1 < 1 < 1 < 1 < 1
18 Biology CFU /
mL
< 10
5
< 10
3
< 10
5
< 10
3
< 10
3
Remarks on the technical specifications
Parameter Remarks
1 pH For stainless steel systems without other materials, pH can be
down to 6.
For closed loop systems, higher pH values are possible
2 Conductivity Conductivity and TDS linked with conversion factor (theoretical
factor possible, but practical determination recommended at
least once)
6 Ryznar Stability Index (RSI) Recommended actions : see table for RSI
7 Chlorine or shock treatment max. 2 ppm for 30 min/day
8 Chlorides (*) Limit 200 ppm applicable when RSI < 5.6 or RSI > 7.5
Instruction book
72 9829 3178 63
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