Additional Fluid Information; Process Water Quality - Standards And Recommendations - Thermo Scientific ThermoFlex Manual De Instrucciones

Additional Fluid
Information
Process Water
Quality and
Standards
Thermo Scientific
When using the ThermoFlex chiller to circulate through aluminum, use a
compatible corrosion inhibitor to prevent galvanic corrosion.
ensure fluid viscosity is 50 cSt or less at the lowest temperature used.
Visible pump weepage may occur when compatible glycols, oils or other
additives are used. Pump weepage is considered as a normal operating
condition of mechanical seal pumps.
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 galvanic
corrosion. These contaminants can function as electrolytes which increase the
potential for galvanic cell corrosion and lead to localized corrosion such as
pitting. Pitting may become so extensive that it causes a breach in the cooling
system resulting in a refrigerant leak into the fluid system.
As an example, raw 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).
Recommendation: Initially fill the reservoir with distilled or 1-3 M
deionized water. (It is acceptable to have the fluid drop to the other levels
over-time.) Do not use untreated tap water as the total ionized solids level
may be too high. This will reduce the electrolytic potential of the water and
prevent or reduce the galvanic corrosion observed.
Permissible (PPM)
0
<25
<25
<1.3
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*
Section 3
Desirable (PPM)
0
<0.6
<10
<1.0
<0.1
0
<0.1
<0.03
0
<0.3
<1.0
<0.3
<1
<0.05
<10
7-8
0.05-0.1*
-cm
Ω
ThermoFlex 3-15