PD series Nafion® dryer
High-capacity gas drying for industrial and analytical applications
The Perma Pure PD series (polytube dryer) is designed for gas conditioning with high flow and maximum drying capacity. Unlike monotube dryers, this series contains several Nafion™ tubes in parallel, resulting in a larger membrane surface and more efficient drying at higher flows of up to 40 L/min.
How does the PD series work?
The PD dryer works on the same selective principle as other Nafion® dryers: the sample gas flows through internal Nafion™ tubes, while a dry purge gas runs in counter-current along the outside. Due to the difference in water vapour partial pressure between sample gas and purge gas, the Nafion™ membrane transports water vapour to the purge side without affecting the other gas components
Bundling several tubes creates a short sample path and a large membrane surface, which provides:
- High drying capacity and fast moisture removal, even at variable flows.
- Low pressure drop and efficient flow.
- Higher maximum flows up to approx. 40 L/min depending on model.
Key features
- Multi-tube design: several Nafion™ tubes in parallel for high capacity.
- High flows up to ~40 L/min: ideal for larger systems and continuous monitoring.
- Selective drying without analyte loss: only water vapour is removed.
- Low pressure drop & fast response: thanks to a shorter sample path and larger membrane surface.
- Broad applicability: for emission measurements (CEMS), process monitoring, laboratories and OEM systems.
- No moving parts: robust, low-maintenance and reliable.
Benefits in use
- Higher capacity than single-tube dryers at comparable dew points.
- Use in large gas conditioning systems, analyser cabinets and field monitors.
- Can be used to "polish" gas before analysis (further drying after a cooling step) for more accurate results and sensor protection.
Performance per model
PD-50: up to 10 lpm
PD-100
PD-200
Typical applications
- CEMS & emission measurements (power plants, industry)
- Procesmonitoring in chemie & petrochemie
- Laboratory and R&D analyses
- Ambient air monitoring & detection systems
- OEM gas analysis integrations
Thanks to the multi-tube design, the PD series performs excellently in systems with variable and higher gas flows, while maintaining analysis quality.
Why choose the PD series through Inacom Instruments?
Inacom Instruments supports customers with:
- Technical selection and sizing
- Integration advice for OEM and analyser cabinets
- Quotation, datasheets and purging advice
- Aftercare and local support
Contact us for advice, specifications or a tailored quotation.
