Coaxial probe for high temperature and high pressure applications
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United States of America Patent
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Nov 4, 2003
Grant Date -
Oct 30, 2003
app pub date -
Apr 29, 2002
filing date -
Apr 29, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A guided wave radar probe defines a transmission line for use with a measurement instrument including a pulse circuit connected to the probe for generating pulses on the transmission line and receiving reflected pulses on the transmission line. The probe includes a center conductor for conducting the pulses. A conductive outer sleeve is coaxial with the center conductor. The conductive outer sleeve has a process end and a connector end. The process end is exposed, in use, to a process environment being measured. A first cylindrical seal element between the center conductor and the outer sleeve is at the sleeve process end. The first cylindrical seal element is of a first material adapted to withstand a relatively high temperature. A second cylindrical seal element is between the center conductor and the outer sleeve disposed between the first cylindrical seal element and the connector end. The second cylindrical seal element is of a second material adapted to withstand a lower temperature than the first cylindrical seal element.
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