Method for generating vapor streams
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United States of America Patent
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Aug 4, 1998
Grant Date -
N/A
app pub date -
Jun 10, 1991
filing date -
Jun 10, 1991
priority date (Note) -
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Abstract
A method is provided for use in generating a chemical vapor stream which may be used to calibrate vapor detectors and for other purposes. The vapor generator is provided with a column having a temperature controlled zone. The chemical is coated onto a carrier such as glass beads and is placed in a temperature controlled zone. A carrier gas is passed over the chemical at a rate which permits the concentration of chemical vapors in the carrier gas to be at saturation. The exiting carrier gas contains chemical vapors at a known concentration. In one embodiment, a second temperature controlled zone is provided downstream, and at a lower temperature than the first zone, to ensure saturation of the carrier gas passing through the second zone.
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