JULABO Magnum 91 Temperature System - Manual (Page 13)

Temperature System Magnum 91
13
2.5. Cooling water connection
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.
Notice: Cooling water circuit
Risk of oil leaking from the cooling circuit (compressor) of the recirculating cooler into the cooling
water in case of a fault in the circuit!
Observe the laws and regulations of the water distribution company valid in the
location where the unit is operated.