USA SALES ONLY
Southeastern Automation, Inc.
PO Box 22820
Knoxville, TN 37933-0820
Phone: (865) 675-3080
Fax: (865) 675-3060
www.southeastern-automation.com
Southeastern Automation Product Sheet
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Southeastern Automation, Inc. |
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Southeastern Automation Product Sheet |
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Perma Pure MD™-Series gas dryers use exclusive Nafion selectively permeable membrane tubing to continuously dry gas streams removing only water vapor. These dryers operate over a wide range of temperatures, pressures and flow rates, and dry to dew points as low as -45°C. Principle of Operation MD-Series gas dryers transfer moisture from one gas stream to a counter-flowing purge gas stream, much like a shell-and-tube heat exchanger transfers heat. Water molecules permeate through the Nafion tube wall, evaporating into the purge gas stream. The water concentration differential between the two gas streams drives the reaction, quickly drying the air or gas. Purge gas should be dry (-40°C dew point) air or other gas. If no dry gas is available, a portion of the gas dried by the MD-Series dryer can act as the purge gas in a split-stream or reflux method.
MD Series
MD Manual |
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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. The dryers are currently available for use with 110 VAC.
MDH Series |
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Perma Pure PD-Series™ gas dryers are multi-tube Nafion dryers designed for high flow, high performance gas drying applications. These dryers can be used to dry to -45°C without removing other compounds. PD-Series dryers consists of a bundle of 0.030" O.D. Nafion tubes housed within a single large tube shell. Feed gas flows within the Nafion tubes while water vapor absorbs into the tubular membrane walls and is removed. Moisture permeating the tubing is carried away by a dry purge gas within the shell that flows countercurrent to the feed. Purge gas should be instrument quality air (-40°C dew point) or nitrogen flowing at two to three times the sample flow rate. Applications for PD-Series gas dryers include gas sample conditioning for continuous emissions and process monitoring. In these applications, sample gases flowing through the Nafion tubing are dried without removing any of the sample analytes. PD-Series dryers are also used as moisture exchangers in fuel cell applications. Fuel cell exhaust gases transfer their moisture and heat to the dry inlet gases (primarily hydrogen). Finally, PD-Series gas driers can be used in small scale process applications. Process applications take advantage of one or more of the unique properties of Nafion: highly efficient and selective moisture exchange, ion exchange capabilities, and extreme corrosion resistance.
PD Series
PD
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PD Molded Manual |
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ME™-Series moisture exchangers from Perma Pure are ideal for both drying and humidifying gas streams. This device uses Nafion® membrane tubing technology to transfer water to or from a gas stream. In either application, ME-Series moisture exchangers will act to achieve equilibrium between the gas inside the tubing and the surrounding atmosphere. This is done without loss of analytes and with no utility requirements. In drying applications, ME-Series moisture exchangers transfer water vapor from a wet gas stream into the surrounding atmosphere. Drying is complete when the sample humidity level is equal to the ambient humidity level. Since drying proceeds as a First Order kinetic reaction, this level can be reached extremely quickly, usually within 100 to 200 milliseconds. This behavior makes the dryer ideal for applications involving a very humid sample at room temperature. Sample humidity can easily be reduced to as low as 10% of its original moisture content with only a short length of Nafion tubing. ME-Series dryers are used to prevent condensation in a variety of gas monitoring equipment. For humidification, the ME-Series will transfer water vapor from the atmosphere to a dry gas flowing within the tubing. Once again, this process occurs in a fraction of a second and is very stable and repeatable under constant operating conditions. A common application is to humidify calibration gases, which allows calibration of analyzers at humidity levels equal to those seen in samples, providing a more consistent calibration/sample baseline.
ME Series
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For applications requiring portability, the DM™-Series desiccant membrane dryer is ideal. No pumps or purge gases are required, yet the cigarette pack-sized dryer removes water vapor from a flowing gas stream for hours, leaving other components in the gas stream unaffected. The dryer can be reused repeatedly and can be recharged in minutes by replacing its desiccant. DM (Desiccant/Membrane) gas dryers combine the selectivity of Nafion® gas dryers with the simplicity of desiccant canister dryers. Gaseous sample flowing through the dryer contacts only Nafion tubing, which very selectively absorbs water vapor from the gas while quantitatively retaining the remaining sample components in the gas stream. Typically water passes through the Nafion tubing wall and is carried away by a dry purge gas; instead, in DM-Series dryers, desiccant packed around the tubing provides a dry purge environment. No power or other utilities are required.
DM Series
DM Manual |
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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.
HD Series Heatless Dryer
HD Manual |
TECH Articles on Nafion Dryers
Application Data Sheet