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Gas Sample Dryer


MD™-Series Gas Sample Dryers

Perma Pure MD™-Series gas sample dryers use exclusive Nafion™ selectively permeable membrane tubing to continuously dry gas streams removing only water vapor. These dryers operate over a wide range of temperatures, pressures and flow rates, and dry to dew points as low as -60°C.

 


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 analytes
  • 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 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-Series dryer with three 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:

1 – Series
4 – Shell and Connector Material
MD (Monotube Dryer) Series
MD
Polypropylene (PP) P
2 – Tubing Size
Fluorocarbon (FEP / PVDF) F
0.050' Nafion™ Tubing
050
FEP Shell, PP Connectors FP
0.070' Nafion™ Tubing
070
Stainless Steel S
0.110' Nafion™ Tubing
110
FEP Shell, Stainless Connectors FS
3 – Dryer Lengths
Element Only (for spare part) E
12' (30 cm)
12
5 – Connector / Spare Part Type
Sample Gas Connector Type
24' (60 cm)
24
1/16' Compression (MD-050 only) 1
48' (120 cm)
48
1/8' Compression 2
72' (180 cm)
72
1/4' Compression 4
96' (240 cm)
96
Spare Part Type
144' (360 cm)
144
Element, PTFE Inserts, EP O-Rings P
288' (720 cm)
288
Element, PTFE Inserts, Viton O-Rings F
    Element, SS Inserts, Viton O-Rings S

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.

 

 

 

 

 

 

 


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