Innovative Water Management Solutions 

Open Loop Systems

310 RO

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The quality of final rinse water has a direct impact on residual contamination levels of the product being cleaned.  Since the final rinse is just prior to the drying section, any materials dissolved in the water may be left behind on the assemblies.  For this reason, use of purified water is recommended.  While tap water may be suitable for drinking purposes, it is not ideal for cleaning printed circuit boards.  Dissolved solids in tap water must be removed before it can be used as an effective final rinse.  The required level of purity of the water is dependent on the nature of the assemblies and the cleanliness specification.  For most applications 1 megohm/cm is the recommended resistivity level for the final rinse.

In closed-loop recycling systems featuring the carbon ion-exchange process, water is deionized and recirculated.  The requirement for purifying make-up water is limited to replacing evaporative losses.  In open loop systems, though, the requirement for ongoing feed water can be as high as 5 gallons per minute (with more required during tank fills).  Using carbon ion-exchange tanks in an open loop process can be costly at these high flow rates.  As an alternative, REsys offers the  Model 310 Reverse Osmosis system.

The 310 is a high capacity unit designed to feed up to 10 gallons per minute of purified water to in-line cleaning systems.  A Reverse Osmosis system uses membranes to filter molecules and ions from water.  95 to 98% of the Total Dissolved Solids (TDS) in water can be removed, depending upon the incoming water supply.  Incoming tap or well water is forced under pressure into the reverse osmosis element.  Once the streams are split, a portion is forced through the membrane, and the remainder is directed across the membrane to keep it clean.  Clean water, or “product water,” will range from 25,000 to 500,000 ohm-cm in conductivity.  Wastewater or “concentrate” is then sent to drain.  The membranes are self-cleaning, and only need maintenance on an annual basis (dependent upon incoming water).  DI Tanks can be added to get the water quality to the desired level of purity.

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