Patent ID: 6642807
Filing Date: 2003-11-04
Classification: G01F,G01S,H01Q

Abstract:
A probe defining 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 comprising:a center conductor for conducting the pulses; a conductive outer sleeve coaxial with the center conductor, the conductive outer sleeve having a process end and a connector end, the process end being exposed, in use, to a process environment being measured; a first cylindrical seal element between the center conductor and the outer sleeve at the sleeve process end, the first cylindrical seal element being of a first material adapted to withstand a relatively high temperature; and a second cylindrical seal element between the center conductor and the outer sleeve disposed between the first cylindrical seal element and the connector end, the second cylindrical seal element being of a second material adapted to withstand a lower temperature than the first cylindrical seal element.