Perma Pure LLC - a Halma Company articles

Setting up a purge gas source for Perma Pure gas sample dryers.

What is a purge gas?
A purge gas is a dry, clean gas that is directed through the purge gas pathway of Perma Pure dryers, countercurrent to the flow of the sample gas through the Nafion tubing. It is important that the purge gas is drier than the sample gas: when the partial pressure of water vapor in the purge gas is less than the sample gas, Nafion™ polymer removes water

A review and comparison of common methods to remove moisture from a gas for analysis.

The MD and PD series have a special tube and shell design developed to be used with a dry purge gas, providing a controlled environment for the moisture transfer to occur. With these products, the end performance is controllable and dependent on the purge gas set up used. In order to get Perma Pure dryers to remove moisture from your gas stream, a gas with lower moisture content than your sample gas must be routed through the purge gas connections on the dryer. This page includes basic

When designing medical equipment, engineers can often feel like Goldilocks when it comes to humidity: there’s too much or too little—and their challenge is to make it just right.

Too Much Humidity is a Frequent Problem

The air (or a gas) can only hold so much water vapor. Depending on external factors like temperature and pressure, water vapor can condense and create lot of problems. Condensation fogs sensors, cause premature equipment wear or rain

Nafion is a polymer that add/remove select materials, including water vapor, to a gas stream through a first order kinetic reaction (a chemical reaction). Because it’s non-porous, other molecules cannot pass through it. This unique property makes it ideal for medical applications such as removing water vapor from breath samples or adding humidity to gas samples for therapeutic purposes.

What is Nafion?

In technical terms, Nafion is a copolymer of tetrafl