HD-Series Heatless Dryer

Perma Pure HD-Series heatless dryers are ideal for low flow air drying operations. Dryer operation is fully automatic, and outlet dew points as low as -50°C can be achieved.

HD dryers consist of two chambers filled with highly adsorbent desiccant. The standard desiccant is molecular sieve 4A. One chamber dries the gas stream while the opposite chamber is regenerated (purged). Purge air is a small portion of dried air taken from the drying chamber, expanded to atmospheric pressure and flowing countercurrent through the regenerating (wet) chamber. Wet purge air is released from an exhaust port in the vapor state so that no drain is required. Purge air volume is controlled with an orifice housed within the unit. Purge air may be vented directly into the surrounding atmosphere, or it may be piped to a remote location. Once electrical power and air pressure are supplied to the dryer, it is ready to be used.

There are two models available. The 7" model is best for flows under 60 liters per minute, while the 12" version is recommended for flows of up to 90 liters per minute. The 12" model is also recommended for applications requiring dew points below 40°C.