JULABO FCW1600_1600S Recirculating coolers - Manual (Page 11)

Recirculating coolers
11
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.