Hydrogen Dryers - MD-Series

Perma Pure LLC

Selectively removes water vapor while retaining analytes
Achieves dew points as low as –40 °C
Suitable for flow rates up to 4 lpm (model dependent)
Available in multiple tubing diameters and configurations
Supports various housing materials for different environments

The MD-Series Gas Dryers from Perma Pure are monotube gas drying systems that use Nafion membrane tubing to selectively remove water vapor from gas samples while preserving other components (analytes). These dryers are capable of achieving dew points as low as –40 °C and are designed for precision moisture control in analytical and process applications. The system operates by passing the sample gas through the Nafion tubing while a dry purge gas flows outside the tubing in a countercurrent configuration. Due to the partial pressure gradient, water vapor permeates through the Nafion membrane into the purge gas stream, producing a dry sample gas output. The MD-Series is available in multiple configurations, including tubing outer diameters (0.050", 0.070", 0.110") and housing materials such as polypropylene, fluorocarbon, and stainless steel. Various end fitting sizes and coiled configurations are also available to meet application-specific requirements.

Use Cases

Gas sample drying for analytical systems
Moisture control in gas analysis applications
Conditioning gas streams prior to measurement or processing

Capabilities

Selective removal of water vapor using Nafion membrane technology
Maintains integrity of analytes during drying
Operates with countercurrent purge gas configuration
Supports multiple flow ranges depending on model (MD-050, MD-070, MD-110)

Perma Pure LLC

Perma Pure is a leading provider of high-performance gas conditioning solutions for the hydrogen industry. Leveraging proprietary Nafion membrane technology, the company specializes in moisture management for PEM fuel cells and electrolyzers, offering humidifiers and dryers that optimize system efficiency, reliability, and lifespan.

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