JULABO FC600-T Recirculating cooler User Manual
Page 13

Recirculating coolers
13
2.5.
Cooling water connection
Only for water cooled models - FCW:
Cooling water pressure (IN / OUT )
max.
6 bar
Difference pressure (IN - OUT )
3.5 to 6 bar
Cooling water temperature
<20 °C
Recommended quality of cooling water:
pH – value
7,5 to 9,0
Sulfate [SO4 2- ]
< 100 ppm
Hydrocarbonate [HCO3- ] / Sulphate [SO4 2-]
> 1 ppm
Hardness [Ca2+, Mg2+] / [HCO3-]
> 0,5 dH
Alkalinity
60 ppm < [HCO3-] < 300 ppm
Conductivity
< 500 μs / cm
Chloride (CL-)
< 50 ppm
Phosphate (PO43-)
< 2 ppm
Ammonia (NH3)
< 0,5 ppm
Free Chlorine
< 0,5 ppm
Ferri Ions (Fe3+ )
< 0,5 ppm
Mangano Ions (Mn2+)
< 0,05 ppm
Carbon dioxide (CO2)
< 10 ppm
Hydrosulfide (H2S)
< 50 ppm
Content of oxygen
< 0,1 ppm
Algae growth
impermissible
Suspended solids
impermissible
Notice:
Danger of corrosion of heat exchanger due to unsuitable quality of
cooling water.
Due to its high content of lime hart water is not suitable for cooling and
causes calcination of the heat exchanger.
Ferrous water or water containing ferrous particles will cause formation of
rust even in heat exchangers made of stainless steel.
Chlorous water will cause pitting corrosion in heat exchangers made of
stainless steel.
Due to its corrosive characteristics distilled and deionized water is
unsuitable and will cause corrosion of the bath. .
Due to its corrosive characteristics sea water is not suitable.
Due to its microbiological (bacteria) 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.
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