Howell Laboratories, Inc.

P. O. Box 389, 188 Harrison Rd., Bridgton Maine 04009 USA

(207) 647-3327	(888) 744-8359	FAX (207) 647-8273	contracts@howelllabs.com

	About Us		Dry Air		Water Treatment		Technical Material		For Vendors

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	Air dehydrators
	Moisture measurement
	Air control panels
	Part number cross-reference
	Field service

	Potable water
	Anti-fouling systems
	Part number cross-reference
	Field service

	Technical bulletins
	Technical sheets
	Dew point calculator
	Material safety data sheets

Purchase order terms and conditions
Vendor HazMat compliance

- An Employee-Owned Company -
Certified to ISO 9001:2000

Low-Pressure Air Dehydration Membrane Function

• Virtually no air (nitrogen & oxygen) molecules escape through the membrane walls.

• Water molecules escape easily through the membrane walls into the purge space.

• Water vapor pressure differential between the main air stream and the purge space pushes water molecules through the membrane walls.

• Dry air purge removes water molecules from the purge space, maintaining the vapor pressure differential and keeping the process going.

NOTES:	Higher inlet pressure yields lower dew point.
	Higher outlet flow yields higher dew point.
	Higher purge flow yields lower dew point.

Key:

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Last updated: 03/18/2008 Webmaster: Al Friend © 2001-2008 Howell Laboratories, Inc. All rights reserved.		Printable Adobe Acrobat version (512 kB)
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