Perma Pure
BE / BE-HP Series – Passive Moisture Exchangers for Simple and Reliable Gas Conditioning
When your application requires moisture control without purge gas, power, or moving parts, the Perma Pure BE and BE-HP Series offers a simple and dependable solution. These braided moisture exchangers use ambient conditions to remove – or add – water vapor, making them ideal for straightforward gas conditioning tasks.
The BE Series is designed for standard pressure applications, while the BE-HP Series extends the same principle to high-pressure environments.
Ambient-driven Nafion™ technology for passive moisture exchange
The BE and BE-HP Series are built around Nafion™ membrane tubing enclosed in a braided protective sheath. As the sample gas flows through the Nafion tubing, water vapor is selectively transferred across the membrane wall.
Instead of using a purge gas, the moisture exchange occurs directly with the surrounding ambient air. When ambient humidity is lower than the sample gas, moisture is removed. When ambient humidity is higher, the same exchanger can be used to add controlled moisture to the gas stream.
This passive operating principle ensures that only water vapor is transferred, while other gas components remain unaffected.
No purge gas, no power – a truly low-maintenance solution
Because the BE Series relies entirely on ambient conditions, installation and operation are exceptionally simple. There are no utilities to connect and no consumables to replace.
With no moving parts and continuous self-regeneration, the exchanger delivers stable performance over time with virtually no maintenance. This makes it especially attractive for distributed systems, remote installations, and calibration setups.
Standard and high-pressure versions for flexible system design
The BE Series is intended for applications with moderate pressures, while the BE-HP Series is engineered for pressures up to 250 psig (17 barg). Both versions offer the same moisture exchange principle and performance characteristics, allowing you to choose the right model based purely on operating pressure.
Multiple active lengths are available to match different flow rates and humidity requirements.
Key features that simplify gas drying and humidification
- Passive moisture exchange using ambient air
- No purge gas or electrical power required
- Selective transfer of water vapor only
- Continuous, self-regenerating operation
- Available for gas drying or gas humidification
- Braided construction for mechanical protection
- BE-HP version for high-pressure applications
Ideal for calibration gases, gas detection, and ambient conditioning
The BE / BE-HP Series is widely used in:
- Gas detection system calibration
- Sensor testing and verification
- Ambient gas conditioning
- Sample pre-conditioning where ambient drying is sufficient
- Two-stage drying systems combined with desiccant dryers
- Applications where simplicity and reliability are key
Practical benefits for accuracy, uptime, and operating cost
By using a passive moisture exchanger, you benefit from:
- Improved sensor accuracy through controlled humidity
- Reduced false alarms in gas detection systems
- Lower operating costs, with no utilities or consumables
- Long service life without performance degradation
- Easy installation in both temporary and permanent setups
These products are used within these applications
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Biogas
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