JULABO HT60-M3 High Temperature Circulator - Manual (Page 16)

Operator responsibility – Safety instructions
16
2.5. Cooling water connection
Cooling water pressure (IN / OUT ) max. 4.5 bar
Difference pressure (IN - OUT ) 2.0 to 4.5 bar
Rate of flow typical 2 l/min
Cooling water temperature <20 °C
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of cooling water.
•
Due to its high content of lime, hard water is not suitable for cooling and causes scale in
the heat exchanger.
•
Ferrous water or water containing ferrous particles will cause formation of rust even in
heat exchangers made of stainless steel.
•
Chlorinated water will cause pitting corrosion in heat exchangers made of stainless steel.
•
Due to their corrosive characteristics, distilled water and deionized water are unsuitable
and will cause corrosion of the bath.
•
Due to its corrosive characteristics, sea water is not suitable.
•
Due to its microbiological (bacterial) components, which settle in the heat exchanger,
untreated and unpurified river water and water from cooling towers is unsuitable.
•
Avoid particulate matter in cooling water.
•
Avoid putrid water.
Recommended quality of cooling water:
pH 7.5 to 9.0
Sulfate [SO4 2- ] < 100 ppm
Hydrocarbonate [HCO 3-]/sulfate [SO4 2-] > 1 ppm
Hardness [Ca 2+, Mg 2+]/[HCO 3-] > 0.5
°
dH
Alkalinity 60 ppm < [HCO 3-] < 300 ppm
Conductivity
< 500 μS/cm
Chloride (Cl -) < 50 ppm
Phosphate (PO4 3-) < 2 ppm
Ammonia (NH3) < 0.5 ppm
Free chlorine < 0.5 ppm
Trivalent iron ions (Fe 3+) < 0.5 ppm
Manganese ions (Mn 2+) < 0.05 ppm
Carbon dioxide (CO2) < 10 ppm
Hydrogen sulfide (H2S) < 50 ppm
Content of oxygen < 0.1 ppm
Algae growth impermissible
Suspended solids impermissible