Thermo Scientific Precision GP 02, Руководство пользователя

Страница: 50 / 68

Precision | 3 - 5 Thermo Scientific
Installation |
Chapter 3
Water Quality and Standards
Process Fluid Permissible (PPM) Desirable (PPM)
Microbiologicals
(algae, bacteria, fungi) 0 0
Inorganic Chemicals
Calcium <25 <0.6
Chloride <25 <100
Copper <13 <10
0.020 ppm if fluid in contact with aluminum
Iron <0.3 <0.1
Lead <0.015 0
Magnesium <12 <0.1
Manganese <0.05 <0.03
Nitrates\Nitrites <10 as N 0
Potassium <20 <0.3
Silicate <25 <1.0
Sodium <20 <0.3
Sulfate <25 <1
Hardness <17 <0.05
Total Dissolved Solids <50 <10
Other Parameters
pH 6.5-8.5 7-8
Resistivity 0.01* 0.05-0.1*
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).
* MΩ-cm (compensated to 25°C)