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PH 55–420 HE

High-performance heatless adsorption dryers designed to deliver ultra-dry compressed air with a pressure dew point down to -70°C, helping protect critical equipment and processes from moisture, condensation and freezing.
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Introduction

Atcorp offers PH 55–420 HE heatless adsorption dryers for industrial applications requiring exceptionally dry compressed air. The range uses high-efficiency molecular sieve desiccant, counter-current regeneration and optimized purge control to achieve a consistent -70°C pressure dew point while minimizing purge losses and pressure drop.

Key Benefits

Ultra-Low -70°C Dew Point
Optimized Purge Nozzle
Molecular Sieve Desiccant –
Energy-Efficient Regeneration
Low Pressure Drop
Spring-Loaded Desiccant

Why Choose pH 55–420 He Adsorption Dryers?

Moisture can cause corrosion, freezing, pneumatic equipment failure and process-quality problems, particularly in applications exposed to low temperatures or requiring extremely dry air. Adsorption dryers address these requirements by removing water vapour through a desiccant rather than simply condensing moisture as a refrigeration dryer does. The PH 55–420 HE is specifically configured to achieve a -70°C pressure dew point using molecular sieve desiccant. Its heatless design uses a portion of dried compressed air for regeneration, while optimized valves and purge nozzles help minimize the amount of regeneration air required.

Model

Version PDP -70° C

Nominal volume flow at dryer inlet (m3/h)

PH 55 HE

90

PH 75 HE

126

PH 95 HE

162

PH 120 HE

198

PH 140 HE

234

PH 190 HE

324

PH 230 HE

396

PH 275 HE

468

PH 350 HE

594

PH 420 HE

702

The PH 55–420 HE uses adsorption and heatless regeneration to continuously produce very dry compressed air.

 

Step 1 – Moist Compressed Air Entry
Compressed air containing water vapour enters the active drying vessel.

 

Step 2 – Pre-Filtration
The upstream filter removes contaminants that could affect the desiccant.

 

Step 3 – Adsorption
The compressed air passes through the molecular sieve, which captures moisture from the air stream.

 

Step 4 – Ultra-Dry Air Delivery
The treated air exits the active vessel with a pressure dew point down to -70°C.

 

Step 5 – Desiccant Saturation
The active desiccant gradually accumulates moisture during the drying cycle.

 

Step 6 – Counter-Current Regeneration
A portion of dry compressed air is directed through the saturated vessel in the opposite direction to remove the accumulated moisture.

 

Step 7 – Vessel Switching
The drying and regeneration vessels alternate automatically.

 

Step 8 – Continuous Dry-Air Production
One vessel dries the compressed air while the other regenerates, allowing uninterrupted operation.

 

The counter-current regeneration arrangement and optimized purge nozzle are designed to improve regeneration efficiency and minimize purge-air losses.

-70°C Pressure Dew Point

The range is specifically designed to achieve a pressure dew point of -70°C / -94°F, making it suitable for applications where exceptionally dry compressed air is required.

 

Molecular Sieve Desiccant

High-efficiency molecular sieve desiccant is selected for applications requiring the deepest level of moisture removal in this range.

 

Counter-Current Regeneration

Regeneration takes place against the direction of the drying airflow, supporting efficient moisture removal and reliable dry-air production.

 

Optimized Purge Air Consumption

The unique valve and exhaust design helps maximize purge-air expansion during regeneration, reducing purge losses.

 

Low Pressure Drop

The optimized valve and exhaust arrangement is designed to minimize pressure drop during the drying cycle, helping reduce the energy penalty associated with air treatment.

 

Spring-Loaded Desiccant

The desiccant is spring-loaded inside the dryer, reducing movement and the risk of crushing during operation.

 

Low Noise During Purging

The dryer design helps reduce noise levels during purge and blow-off cycles, making it more suitable for industrial installations where acoustic performance matters.

 

Easy Desiccant Servicing

Desiccant bags provide convenient access from the top, simplifying maintenance and replacement.

 

Advanced Monitoring

The optional PureLogic controller provides enhanced control and monitoring capabilities, with communication options including Modbus, Profibus and Ethernet/IP.

 

Flexible Installation

The range is designed for transportability and mounting, with a wall-mounting kit available for PH 55–190 HE models.

Drying Technology

  • Heatless adsorption
  • Dual-vessel operation
  • -70°C pressure dew point
  • Molecular sieve desiccant
  • Counter-current regeneration
  • Optimized purge-air management

Energy Management

  • Compressor synchronization
  • Purge nozzle optimization
  • Low pressure drop
  • Reduced purge loss
  • Optimized regeneration cycle

Mechanical Construction

  • Extruded aluminum profile
  • Spring-loaded desiccant
  • Robust valve arrangement
  • Low-noise purge and blow-off
  • Transportable design

Filtration

  • Standard pre-filter
  • Standard after-filter
  • Clean compressed-air delivery

Control & Monitoring

  • Integrated display
  • Optional PureLogic controller
  • Optional PDP control
  • Modbus communication
  • Profibus communication
  • Ethernet/IP communication

Installation Options

  • Standard floor/industrial installation
  • Optional wall-mounting kit for PH 55–190 HE
  • Optional IP65 protection

These features and options are based on the current product information and supporting manufacturer documentation.

Industrial Applications

PH 55–420 HE adsorption dryers are suitable for industrial compressed-air applications where extremely low moisture levels are important for equipment protection, process reliability or product quality.
Pharmaceutical Manufacturing
Provides ultra-dry compressed air for selected pharmaceutical production and utility applications where moisture control is critical.
Electronics Manufacturing
Helps protect sensitive production equipment and pneumatic systems from condensation and moisture-related problems.
Instrumentation & Control Air
Suitable for pneumatic instrumentation and control systems requiring exceptionally dry compressed air.
Precision Manufacturing
Supports precision equipment where moisture can affect reliability, accuracy or operating performance.
Food & Beverage Manufacturing
Can support applications requiring controlled moisture levels, subject to the specific air-quality requirements of the process.

Frequently Asked Questions

Find answers about PH 55–420 HE heatless adsorption dryers, -70°C dew point performance, molecular sieve desiccant, regeneration, capacity, controls and installation.
The PH 55–420 HE is a range of extruded-profile heatless adsorption dryers designed to provide ultra-dry compressed air with a pressure dew point of -70°C / -94°F.
The range is specifically designed for a -70°C / -94°F pressure dew point.
The PH 55–420 HE range covers nominal inlet flows from 90 to 702 m³/h.
The range includes PH 55, PH 75, PH 95, PH 120, PH 140, PH 190, PH 230, PH 275, PH 350 and PH 420 HE.
Selection should consider compressed-air flow, operating pressure, required -70°C dew point, inlet temperature, ambient conditions, purge-air requirements and installation space.
Yes. Atcorp can help Indian industrial customers assess their compressed-air drying requirements and select the appropriate PH 55–420 HE model based on airflow, pressure, dew-point requirements and site conditions.

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