The Donaldson Ultradryer HRS+ series are heated desiccant dryers designed for drying of compressed air and nitrogen in a pressure range up to 10 bar. This is most energy-conscious model, designed for continuous operation.

This zero purge desiccant dryer uses ambient air drawn in by a blower for desorption and cooling, helping to provide effective drying performance while minimizing compressed air consumption.

With flow capacities from 375 to 8,760 m³/h, supports a range of industrial applications requiring clean, dry compressed air and stable dewpoints.

Main features and technical specifications are desorption and cooling with ambient air drawn in by a blower (Blower Purge Dryer functionality integrated); desorption in counter-current flow; energy-saving with zero purge concept and low desorption temperature; low operating cost; Dry Gas/Purge Cooling On-Demand; easy maintenance and access to key components; pressure dewpoints of -40 °C (at 7 bar) or lower can be achieved.