Patent ID: 6325391
Filing Date: 2001-12-04
Classification: G01F,Y10S

Abstract:
A process isolation window seal and microwave energy transmitting assembly used for determining the level of a material in a container having an opening in an upper side, the opening being surrounded by a bounding surface, the seal and assembly comprising:a microwave transmissive seal member of size to close the opening of the container and having a seal member flange of size to be supported on the bounding surface of the container, microwave energy being transmitted through the seal member;an electromagnetic interference (EMI) shielding material first ring surrounding a periphery of the seal member flange and having a height substantially to enclose an edge surface of the seal member flange, an edge surface of said first ring positioned to face the bounding surface of the opening of the container and having a groove formed therein surrounding the seal member flange; anda resilient second ring of material that provides electromagnetic interference shielding mounted in said groove for sealing on the bounding surface.