Preconcentrator for chemical detection
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Nov 17, 1999
filing date -
Nov 17, 1999
priority date (Note) -
Expired
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Abstract
An apparatus for detecting chemicals in a fluid includes a preconcentrator tube connected to a bi-directional pump and to a detector. The preconcentrator tube contains a sorbent material in thermal contact with a heating element. The bi-directional pump pumps fluid in a first direction through the sorbent material, thereby causing some of the chemicals to accumulate on one side of the sorbent material. The bi-directional pump is reversed so as to pump fluid in a second opposite direction, thereby causing the accumulated chemicals to be carried to the detector. The sorbent material is heated while the bi-directional pump is reversed. Preferably, the detector is equipped with a separate pump that draws fluid to the detector.
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