MDH™–Series Heated Gas Dryer

MD-H-Photo Further Information:

Perma Pure’s heated MDH-Series gas dryers were specifically created to dry gas samples with dew points higher than ambient temperature without requiring separate heating elements or insulation. Proprietary Nafion™ technology selectively removes only water from sample gases, leaving the rest of the gas sample unaffected. Unlike chillers and condensers, Perma Pure’s MDH dryers remove water directly from the vapor phase, preventing the loss of water-soluble gases through dissolution in condensate.

Designed to handle gas flows of up to 1.5 lpm, the heated MDH-Series gas dryers can dry gases with as much as 30% water by volume. The compact design can be incorporated easily into analyzer cabinets or used as a stand-alone device. Specifications are shown in the table below.

Model Number


Nafion™ Tube OD/ID



96 inches

Nafion™ Dryer Housing




Thermostat Set Point

80° C

Voltages Available

115 & 220 VAC; 12 VDC

Power Requirements

0.3 Amps, 30 Watts


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

PP-Apple-App PP-Android-App

Guide to Gas Sample Drying


Free White Paper

All About Nafion


Technical Information

Contact Us Now!

Your Name (required)

Your Email (required)

Your Company & Location (required)

Subject or Your Question