Single-Tube Dryer for Flow Rates up to 4 lpm
- Removes only water vapor from gas stream
- Dries continuously with no moving parts
- Can process almost any gas
- Extreme corrosion resistance
- Compact, flexible design
- No electricity required for drying
Perma Pure MD-Series gas dryers are single tube Nafion® dryers designed for high performance gas monitoring applications. These dryers can be used to dry a sample to as low as –45° C without removing sample analytes. The Perma Pure dryers consist of a single Nafion tube housed within a stainless steel or flexible plastic tube shell.
Sample gas flows within the Nafion tube while water vapor absorbs into the Nafion membrane tube walls and is removed. A dry purge gas within the shell that flows countercurrent to the sample carries moisture permeating the
membrane away. Purge gas should be instrument quality (-40° C dew point) air or nitrogen flowing at two to three times the sample flow rate.
Perma Pure offers three MD dryer product lines: MD-050, MD-070, and MD-110 (050, 070, and 110 correspond to a Nafion tube outside diameter of 0.050", 0.070", and 0.110" respectively). Dryers are available in lengths of 12", 24", 48", 72", 96" and 144", depending on the dryness required. Each model is available in stainless steel (S), fluorocarbon (F), and polypropylene (P) versions to accommodate corrosion resistance and temperature requirements.
MD-050 dryers are used for up to 200 cc/min. gas flow rates. MD-070 and MD-110 dryers are both suitable for flows of up to 2 liters per minute. These two dryers offer approximately the same drying performance; select the MD-110 when pressure drop is a concern and the MD-070 when minimizing dead volume.