Rosemount Inc.

Steven D Kruse

Randall C Olson

Dennis John Smith

James L Gravel

Bruce L Johnson

James A Kronmiller

A process seal made of a material such as polytetrafluoroethylene is used as a microwave window in a radar tank level gauge. The periphery of the process seal is surrounded by a metal containment ring that is fitted to the periphery to limit the amount of expansion outwardly of the process seal material as well as provide for localized loading at the periphery for clamping pressures on the seal. Electromagnetic radiation shielding is provided not only by the containment ring, but also by an EMI shielding O-ring mounted in a groove on a sealing end of the containment ring. A process environmental O-ring is carried by the process seal in an outer shoulder groove that is enclosed by the containment ring.

PTFE window seal with EMI shielding

A process seal assembly adapted for installation to a process vessel opening. A probe with a probe connector connects to a rod inside a passageway of a housing adapted to be sealingly mounted to the process vessel opening. The rod has a first end coupled to the probe connector and a second end adapted to couple with a transmitter connector body. A rigid, electrically insulating spool is fastened in the passageway, with an outer spool surface fitting tightly to a wall of the passageway and an axial hole fitting tightly to the rod.

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Bloomington, MN, United States of America

Steven D Kruse