Air Power Products Limited (APPL) products

Purge Economizer Controls is an energy management system which allows the air dryer user to operate at a specified outlet dewpoint, and maintain that dewpoint level within a close tolerance, while reducing the volume of purge air required. The volume of purge air will vary proportionally with the volume of air being dried. Standard timed based controls do not allow for purge adjustment due to demand fluctuations, or reduction in dryer loading. Purge flow must be fixed for a maximum dryer inlet capacity based on an anticipated operating pressure with standard time based controls.