Model MD-R Series - Gas Sample / Membrane Air Dryers
Perma Pure MD-R-Series Membrane Air Dryers use exclusive Nafion selectively permeable membrane tubing to continuously dry gas streams removing only water vapor. These Air Dryers operate over a wide range of temperatures, pressures and flow rates, and dry to dew points as low as -60°C.
- Flow rates up to 4 l/m
- Operating temperatures to max. 120° C
- Operating pressures to 100 psi (absolute)
- Straight or coiled configuration
- Corrosion resistant
- Standard dew points to – 25° C, with – 60° C possible in special cases (contact factory)
- No loss of analytes
- No moving parts
Principle of Operation
The MD-R Series Membrane Air Dryers transfer moisture from one gas stream to a counter-flowing purge gas stream, much like a shell-and-tube heat exchanger transfers heat. Water molecules permeate through the Nafion® tube wall, evaporating into the purge gas stream. The water concentration differential between the two gas streams drives the reaction, quickly drying the air or gas. Purge gas should be dry (-40°C dew point) air or other gas. If no dry gas is available, a portion of the gas dried by the MD-Series dryer can act as the purge gas in a split-stream or reflux method. Visit the Purge Gas Configurations page to learn more about the purge methods Perma Pure customers deploy in their equipment.
Intelligent Product Numbering System
Perma Pure offers the MD-R Series Membrane Air Dryer with two sizes of Nafion® tubing and in a variety of lengths and connection types. Choose the size based on your flow rate and dryness requirement and build your MD dryer according to the selection guide and the part number table below: