BE-HP™-Series High Pressure / High Performance Braided Exchangers from Perma Pure have been tested to be used with high pressure gas streams to exploit the pressure differential to effectively dry gas streams. The Nafion tubing is exposed to the atmosphere, and the moisture content is equalized  with that of the surrounding atmosphere using Nafion™ membrane tubing technology to transfer the water. As the pressure is released and brought to ambient at the outlet, the gas stream is dried into proportion to this pressure differential. This is shown in the performance graoh below.

  • High pressure rating to 27 bar
  • Transfers only water vapor
  • Continuously regenerated
  • Adjusts to ambient humidity
  • No purge gas needed, but an enclosure fan is recommended
  • Fast response time
  • High pressure compression fittings available

Principle of Operation – Drying

In drying applications, BE-Series Braided Exchangers transfer water vapor from a wet gas stream into the surrounding atmosphere. Drying is complete when the sample humidity level is equal to the ambient humidity level. Since drying proceeds as a First Order kinetic reaction, this level can be reached extremely quickly, usually within 100 to 200 milliseconds. This behavior makes the dryer ideal for applications involving a very humid sample at room temperature. Sample humidity can easily be reduced to as low as 10% of its original moisture content with only a short length of Nafion™ tubing.

Intelligent Product Numbering System

Perma Pure offers the BE Series dryer with four 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 ME according to the selection guide and the part number table below:

1 – Series
BE Moisture Exchanger Series BE
2 – Tubing Size
0.050″ Nafion™ Tubing 050
0.060″ Nafion™ Tubing 060
0.070″ Nafion™ Tubing 070
0.110″ Nafion™ Tubing 110
3 – Dryer Lengths
12″ (30 cm) 12
24″ (60 cm) 24
48″ (120 cm) 48
72″ (180 cm) 72
4 – Connector Type
1/8″ Stainless Steel Compression Fittings (BE-060 Only) COMP2
1/4″ Molded Headers for 1/4″ Compression Fittings (BE-110 only) COMP4
Barbed Ends (1/16″ for BE-050 and BE-060; 1/8″ for BE-070 and BE-110) BB

Perma Pure has created a series of short video presentations to describe the basic functionality of some of our products. The videos are posted below.

Nafion™ Tubing Basic Functionality

Perma Pure MD and PD Gas Sample Dryers Basic Functionality