Perma Pure Gas Sample Dryers Selection Guide

Perma Pure offers a wide range of Gas Sample Drying products that can be tailor-made for your application. Perma Pure’s MD Series™ and PD Series™ dryers are the ideal choice for drying gas samples prior to analysis. Using our exclusive Nafion™ technology, Perma Pure dryers can reduce the sample dew point to as low as -45°C without any measurable loss of analytes. The exceptional corrosion resistance of Nafion™ allows for the conditioning of harsh samples, even those rich in acids like HF and HCl. A brief review of each product line is shown below. Select your dryer based on your sample gas flow:

Gas Sample Drying
Flow Rates 0-4 lpm

Gas Sample Drying
Flow Rates 0-4 lpm

Gas Sample Drying
Flow Rates 1-40 lpm

Hot Gas Sample Drying
Flow Rates to 1 lpm

selector-md selector-mdr-series selector-pd selector-mdh

MD Dryer Series

The MD (Monotube Dryer) Series transfers moisture from one gas stream to a counter-flowing dry purge gas stream, much like a shell-and-tube heat exchanger transfers heat, using one Nafion™ tube. A wide range of lengths and tube diameters is available to cover the sample gas flow ranges of 0-4 lpm.

MD-R Dryer Series

The MD-R (Monotube Dryer, Rotating) Series is nearly identical to the MD Series with the advantage of rotating purge fitting ends, making it easier to install in your equipment. Like the MD, a wide range of lengths and tube diameters is available to cover the sample gas flow ranges of 0-4 lpm.

PD Dryer Series

The PD (Polytube Dryer) Series transfers moisture from one gas stream to a counter-flowing dry purge gas stream, much like a shell-and-tube heat exchanger transfers heat, using multiple Nafion™ tubes. These are chosen when the MD dryers do not offer the flow capacity required. A wide range of lengths and tube diameters is available to cover the sample gas flow range of 1-40lpm.

MD-H Heated Dryer

The MD-H Heated Dryer Series is a version of the MD Series where the first 24″ of the dryer is heated in order to handle hot and wet sample streams.

Short Video Presentations

Perma Pure has created a series of short video presentations to describe the basic functionality of Nafion™ Tubing and our Gas Sample Dryers. The videos are posted below. View the Nafion™ Tubing video before moving on to the Dryers.

Nafion™ Tubing Basic Functionality

Perma Pure MD and PD Gas Sample Dryers Basic Functionality


Selectivity

Nafion is not only highly resistant to chemical attack, it also exhibits highly selective absorption and transfer of compounds. Most substances are retained quantitatively. Although they do not attack or damage the Nafion tubing, some polar organic substances are absorbed and consequently lost. Ammonia and amines are also absorbed and lost to some degree. For retention information on specific chemicals, use the following pull down menu.


Perma Pure Dryer App

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Guide to Gas Sample Drying

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Free White Paper

All About Nafion

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Technical Information

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