Patent ID: 6247362
Filing Date: 2001-06-19
Classification: G01F

Abstract:
A high temperature high pressure process seal for use with a process instrument having a control housing assembly with a control connection having a 50 ohm impedance and a sensing element extending into a high temperature high pressure process vessel, the sensing element including a process connection having a 50 ohm impedance, the seal for operatively connecting the sensing element to the control housing assembly and comprising:an elongate cylindrical hollow seal adapter receivable in an opening of the process vessel;an elongate shaft coaxial with and extending through the adapter and adapted to connect the control connection to the process connection; anda hard seal material between a select portion of the shaft and the adapter and bonded to the shaft and the adapter, radial spacing between the shaft and the adapter being greater at the select portion to provide a 50 ohm feed-through from the control connection to the process connection.