Wafer devices have only a small permeable window, or wafer, so permeation rates are
typically lower than rates for tubular devices. Since permeation occurs only through the
polymeric wafer, the permeation rate is controlled by varying the wafer material, the
thickness of the wafer, and the diameter of the permeation opening. Gases whose high
vapor pressure at normal permeation temperatures prevent their containment in a tubular
device can be contained in a wafer device. Wafer devices are available in different styles to
allow use in calibrators made by various manufacturers.
MORE INFORMATION
TECHNICAL NOTES
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Generating Calibration Gas
Standards with Dynacal®
Permeation Devices
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Generating a Part Number
for a Dynacal® Permeation
Device
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