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MD Series Gas Dryers
Brand: Perma Pure
Powered by Nafion™ tubing, Perma Pure gas dryers selectively remove water from a gas sample.
This selectivity for water vapor allows our dryers to remove more moisture than other gas drying solutions, while keeping analytes in the gas sample.
Monotube Dryer Series (MD-Series) gas dryers contain a single Nafion™ tube. The MD-Series can dry a gas to humidity levels as low as –40 °C dew point and is ideal for applications with flow rates up to 4 lpm.
U-Shaped configuration available in overstock (i.e.: MD-110-03-37 as pictured here is old stock and comes with no warranty).
How it Works
Flow your sample gas through the Nafion™ tubing and flow a dry purge gas outside the Nafion™ tubing, countercurrent to the sample gas flow.
While the partial pressure of water in the purge gas is less than in the sample gas, Nafion™ polymer will selectively transfer water and water vapor from the sample gas across its membrane and into the purge gas flow, yielding a drier sample gas at the sample gas output.
Features- Dries continuously
- Removes only water vapor
- Achieves low dew points
- Requires no electricity
- Maintenance-free operation
- No moving parts
- Excellent corrosion resistance
- Short residence time
Specifications
Brand
Nafion™ Tubing Outer Diameter Options
- 0.050" (MD-050)
- 0.070" (MD-070)
- 0.110" (MD-110)
Max Flow Rate
- 0.2 lpm (MD-050)
- 4 lpm (MD-070)
- 4 lpm (MD-110)
Housing Materials Available
- Polypropylene, Fluorocarbon, or Stainless Steel
Max Operating Temperatures
- 80°C for polypropylene housing
- 100°C for fluorocarbon or stainless steel housing
Sample Gas Port – End Fitting Options
- Port 1/16" Compression (MD-050, Stainless Steel Only)
- Port 1/8" Compression (All models)
- Port 1/4" Compression (MD-070, MD-110)
Purge Gas Port – End Fitting Size
- Port 1/8" Compression (MD-050)
- Port 1/4” Compression (MD-070, MD-110)
Purge Gas Recommendations
- Purge gas must be drier than sample gas
- Purge gas can be instrument quality air (max -40°C dew point) or nitrogen
- Purge gas should flow at 2 or 3 times the sample rate
- Alternate methods to using a purge gas are possible, such as recycling the dry sample gas, or pulling vacuum through the purge gas flow path.
Coiled Configurations
- Certain models are shipped coiled based on length