Thermo Scientific Precision Guide De Démarrage Rapide page 50

Thermo Scientific
Process Fluid
Microbiologicals
(algae, bacteria, fungi)
Inorganic Chemicals
Calcium
Chloride
Copper
Iron
Lead
Magnesium
Manganese
Nitrates\Nitrites
Potassium
Silicate
Sodium
Sulfate
Hardness
Total Dissolved Solids
Other Parameters
pH
Resistivity
* MΩ-cm (compensated to 25°C)
Unfavorably high total ionized solids (TIS) can accelerate the rate of corrosion. These contaminants
function as electrolytes which increase the potential for galvanic cell corrosion.
Tap water is not normally recommended because the total ionized solids level may be too high. As
an example, tap water in the United States averages 171 ppm (of NaCl). The recommended level
for use in a water system is between 0.5 to 5.0 ppm (of NaCl).
Water Quality and Standards
Permissible (PPM)
0
<25
<25
<13
0.020 ppm if fluid in contact with aluminum
<0.3
<0.015
<12
<0.05
<10 as N
<20
<25
<20
<25
<17
<50
6.5-8.5
0.01*
Chapter 3
Installation |
Desirable (PPM)
0
<0.6
<100
<10
<0.1
0
<0.1
<0.03
0
<0.3
<1.0
<0.3
<1
<0.05
<10
7-8
0.05-0.1*
Precision
3-5
|