Perma Pure Gas Sample Dryer

Product Feature

• 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 analyses
• No moving parts

Principle of Operation

MD-Series gas dryers transfer moisture from one gas stream to a counter-flowing purge gas stream, much like a shell-and-tube heat exchange 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.

Recommended Sample Gas Flow Rates

• 0-0.2 lpm: MD-050 Series
• 0.1-2 lpm: MD-070 Series
• 1-4 lpm: MD-110 Series

Notes: ¹MD-050 dryers are not offered in 96 and 144 inch lengths. ²MD-070 and MD-110 offer approximately the same drying performance. Specify MD-110 when pressure drop is a concern, MD-070 to minimize dead volume. For higher flow rates, please see our PD-Series dryers.