Control Humidity of Your Aerosol Samples Without Particle Losses
The MD‐700 has been specifically developed for humidity control in particle measurement and aerosol analysis applications. In order to minimize particle losses, a laminar sample flow should be maintained through the flow path of the dryer. The MD‐700 addresses these performance needs while providing the moisture removal necessary to make accurate measurements across a wide range of flow rates. All moisture is removed in the vapor phase with a purge gas flow. Features and benefits of the dryer are listed below:
- Low particle losses due the large diameter 17mm (0.700”) Nafion™ tubing used in the design
- Eliminates the need for heating the sample gas stream, preserving the volatile particulate component
- Grounded Stainless Steel Tube and Shell Construction eliminates buildup of static electricity and provides long service life outdoors
- Straight Configuration in 6,12, 24, and 48 inch versions minimizes turbulent flow that causes losses
- Dryer is continuously regenerating, eliminating the need to repeatedly replace desiccant
- Designed to be used with the vacuum reflux purge gas method where no dry or instrument air is available.
Principle of Operation
MD-700 Series gas 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™ tubing 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-700 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.
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