Patent ID: 7239267
Filing Date: 2007-07-03
Classification: G01F,G01S

Abstract:
1. A radar level gauge system for measuring a distance to a surface of a content in a container relatively to a measuring position, which is located above the surface and geometrically defined in relation to said container, said radar level gauge comprising: a power supply interface for receiving electrical power to said radar level gauge, a communication interface for presenting externally of said radar level gauge information based on said measured distance; a transmitter for generating and transmitting an electromagnetic transmitter signal; means for directing said transmitter signal towards said surface and for receiving a reception pulse reflected back from said surface; a receiver for receiving said reception pulse; processing circuitry coupled to the transmitter and the receiver for determining said distance and to said communication interface for providing said information; a fastening structure adapted to secure said means for directing in said measuring position, said fastening structure arranged to provide a spatial orientation of said means for directing, such that the directing of said transmitter signal is generally vertical, wherein said fastening structure has a first sealing surface adapted to mechanically couple with a second sealing surface of a feed-through structure located in an upper boundary of said container; a sealing unit adapted to provide a pressure tight seal joint between said fastening structure and said feed-through when subjected to pressure between said first and second sealing surfaces; and means for blocking electromagnetic energy, adapted to suppress net transfer of electromagnetic energy through said sealing unit from the inside to the outside of said container; wherein the sealing unit comprises a sealing list or gasket made of a pressure sealing material and a microwave attenuating material, whereby the means for blocking electromagnetic energy is integrated in the sealing unit; and wherein said sealing unit constitutes the single pressure sealing means provided between said fastening structure and said feed-through structure.