Measuring and testing – Sampler – sample handling – etc. – With heating or cooling
Patent
1997-04-28
1999-10-26
Noland, Thomas P.
Measuring and testing
Sampler, sample handling, etc.
With heating or cooling
73 2341, 7386484, G01N 3054
Patent
active
059708042
ABSTRACT:
This invention provides methods and apparatus for determining the presence or absence of a specific constituent in a mixture. A thermal desorption unit includes a body providing a desorption chamber, a removable end cap for closing the chamber, a desorber heating system arranged to heat the desorption chamber, a gas inlet to the desorption chamber, and a gas outlet from the desorption chamber. A valve assembly can operate in a run mode to direct a carrier gas to the thermal desorption unit gas inlet, and couple the thermal desorption unit gas outlet to an inlet of a sample analysis instrument. The valve assembly also can operate in a flush mode to direct the carrier gas to the inlet of the gas analysis instrument, direct a flushing gas to the thermal desorption unit gas inlet, and couple the thermal desorption unit gas outlet to an exhaust.
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Noland Thomas P.
Trustees of Tufts College
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