Thermal conductivity detector
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United States of America Patent
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Mar 25, 2008
Grant Date -
Jun 28, 2007
app pub date -
Dec 23, 2005
filing date -
Dec 23, 2005
priority date (Note) -
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Abstract
A thermal conductivity detector (TCD) utilizes a modular thermistor assembly that mounts to the TCD body. The thermistor assembly is easily replaceable in the TCD. Within the TCD, a thermistor bead is always held in the same relative location in a gas flow path, which is designed to produce laminar, low velocity gas flow across the thermistor bead. Two TCDs, each having a heater, are mounted in an insulated enclosure. The heaters are activated to bring the TCDs to operating temperature, and are then deactivated during analysis.
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