BE Moisture Exchangers for Drying

Compact, passive gas dryer without purge gas

Perma Pure BE series Nafion® dryers use high-grade Nafion™ membrane technology to remove water vapour from gas streams or correct it to ambient humidity, entirely without an external purge gas source or power supply. This makes the BE series ideal for situations where space, simplicity and reliability are important.

How does the BE dryer work?

The BE series works via an ionic Nafion™ membrane that only lets water molecules through. When a humid gas sample flows through the Nafion tubing, the drying or humidifying process follows automatically:

• Water molecules migrate from the gas stream to the outside of the Nafion membranes, where the humidity is lower.
• The process follows a first-order kinetic reaction, so equilibrium is reached quickly (often within 100–200 ms).
• The humidity is adjusted to the environment without loss of analytes or other gas components.
• Doordat er geen purge-gas of extra apparatuur nodig is, is de BE-droger bijzonder eenvoudig te integreren.

This means a gas stream with a high relative humidity can be dried quickly to a level matching the ambient air, without complex control or additives.

Key features

• No external purge gas source needed: works solely with the Nafion membrane and ambient air.
• Only transports water vapour: no loss of analytes or other gas components.
• Continuously regenerating: the BE series regenerates itself during use.
• Adapts to ambient humidity: gas humidity becomes equal to the ambient air.
• Fast response: thanks to first-order kinetics, ideal for variable sample conditions.
• No power or moving parts: compact, light and low-maintenance.
• Excellent corrosion resistance: suitable for a variety of gas analyses.

Applications

The BE series is suitable for a wide range of applications, such as:

• Gas detection systems
• Analyser-voorconditioning in laboratoriuminstrumentatie
• OEM systems with limited space or utilities
• Kalibratiemiddelen waar vochtcontrole nodig is
• Situations where condensation must be minimised

Because there is no external purge gas source and the design is simple, the BE series is highly suitable for portable and compact measurement setups.

Technical options & mounting