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An improved housing assembly is used for a microwave level sensing instrument for sensing level of a process fluid in a vessel. The process vessel includes a vessel flange defining an opening into a storage space in the vessel. The housing assembly includes a flange assembly including a housing flan

An improved housing assembly is used for a microwave level sensing instrument for sensing level of a process fluid in a vessel. The process vessel includes a vessel flange defining an opening into a storage space in the vessel. The housing assembly includes a flange assembly including a housing flange having a distal gasket face sealingly mateable with the vessel flange in use. The housing flange is connected to a window housing for housing a window spaced from the gasket face and providing a process seal. An electronics housing is mounted to the window housing. The electronics housing supports a microwave antenna proximate the window for focusing energy through the window to the process fluid.

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In a microwave level sensing instrument for sensing level of a process fluid in a process vessel, the process vessel including a vessel flange defining an opening into a storage space in the vessel, an improved housing assembly comprising: a flange assembly including a housing flange having a distal

In a microwave level sensing instrument for sensing level of a process fluid in a process vessel, the process vessel including a vessel flange defining an opening into a storage space in the vessel, an improved housing assembly comprising: a flange assembly including a housing flange having a distal gasket face sealingly mateable with the vessel flange, in use, and connected to a window housing for housing a window spaced from the gasket face and providing a process seal; and an electronics housing mounted to said window housing, the electronics housing supporting a microwave antenna proximate the window for focusing energy through the window to the process fluid.