Overview

The Ultradryer+ dryer range covers flow capacities from 375 to 8,760 m³/h (220 to 5,158 scfm), offering solutions for both moderate and high-volume compressed air systems. With multiple configurations available – including zero purge desiccant dryers and externally heated and purge cooling twin tower dryers – the Ultradryer+ dryer product line supports stable system operation and clean, dry air across a wide range of industries.

Key system features include:

  • Ultraconomy Dewpoint Capacity Control – supports better utilization of desiccant capacity by adjusting cycle times.
  • Zero Purge Dryer Options – Designed to operate without using compressed air for regeneration.
  • Ethernet Communication Interface – Ready for integration into networked production environments.
  • Valve Position Control – Helps manage system performance.
  • Power Supply and Alarm Contacts – For electronic drains and external devices.
  • Control Box Temperature Control Included – For supporting stable operation in demanding environments.
  • Single Conductor Cable Marking – Supports simple electrical maintenance and installation.
  • High-Temperature Resistant Paint – Provides protection for equipment in harsh operating environments.
  • Flexible Design – Suitable for various climate zones and operating conditions, including high ambient temperatures.
  • Consistent Drying Performance – Helps maintains stable dewpoints under continuous operation.

Ultradryer HRS+ Zero Purge Desiccant Dryer

 

Supporting Energy Efficiency with the Ultradryer+ Option

The HRS+ version is our most energy-conscious model in the Ultradryer+ dryer lineup, 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 (220 to 5,158 scfm), the HRS+ supports a range of industrial applications requiring clean, dry compressed air and stable dewpoints.

Main Features & Specifications

  • Desorption and cooling with ambient air drawn in by a blower (Blower Purge Dryer functionality integrated)
  • Desorption in counter-current flow for effective drying
  • Designed to support 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 /-40°F (at 7 bar/100 psig) or lower can be achieved

Applications

  • Automotive and electronics manufacturing
  • Food and beverage industries
  • General industrial compressed air systems

Ultradryer HRS-L+ Heated Purge Desiccant Dryer

 

Designed for Tropical & Subtropical Conditions

The HRS-L+ version is specifically engineered for demanding environments with high ambient temperatures and humidity. This model incorporates closed-loop cooling with a water-cooled heat exchanger to support reliable drying performance in challenging climate zones. With flow capacities from 375 to 8,760 m³/h (220 to 5,158 scfm), the HRS-L+ helps provide dependable compressed air quality and stable dewpoints even under extreme environmental conditions.

Main Features & Specifications

  • Closed-loop cooling with a water-cooled heat exchanger
  • Designed to support energy-saving design with zero purge concept
  • Low operating cost through efficient system operation
  • Easy maintenance with accessible components
  •  Cooling Water Shut-Off Valve for additional operational control
  • Pressure dewpoint down to -70°C /-100°F (at 7 bar/100 psig) for critical air quality needs

Applications

  • Industrial plants in tropical and subtropical regions
  • Paint and surface finishing processes
  • Facilities requiring reliable air quality under high ambient temperatures
  • Electronic industries with high air purity demand

Ultradryer HRE+ Externally Heated Twin Tower Dryer

 

Purge Cooling for Applications at High Ambient Temperature Conditions

The HRE+ model is a robust externally heated twin tower dryer designed for large-scale compressed air systems requiring continuous, high-volume drying. With flow capacities up to 8,760 m³/h (5,158 scfm), this dryer helps to provide stable dewpoints even during demanding production cycles.

This model is equipped with purge cooling, making it suitable for all climate zones, including those with high ambient temperatures.

Main Features & Specifications

  • Suitable for all climate zones
  • Low investment cost
  • Easy maintenance with convenient access to critical components
  • Pressure dewpoints of  -40°C /-40°F (at 7 bar/100 psig) or lower can be achieved

Applications

  • Petrochemical and power generation industries
  • High-volume manufacturing environments
  • Industrial processes requiring ultra-dry compressed air

Availability varies by region.  Please contact your local Donaldson representative for specific availability in your region. All products, specifications, and availability are subject to change without notice.