Level gage waveguide process seal having wavelength-based dimens

Details Level gage waveguide process seal having wavelength-based dimens Level gage waveguide process seal having wavelength-based dimens

1997-06-27

1999-02-16

Pascal, Robert

Wave transmission lines and networks

Long line elements and components

Waveguide elements and components

342124, H01P 108, G01F 23284

Patent

active

058724940

ABSTRACT:
A waveguide assembly for a process sealed level gage includes first and second waveguide portions, a process sealing cavity and a mechanical barrier. The first waveguide portion has a first waveguide bore. The second waveguide portion is fastened to the first waveguide portion and has a second waveguide bore which is axially aligned with the first waveguide bore for communicating microwave signals at a waveguide wavelength .lambda..sub.G between the waveguide bores. The process sealing cavity is formed at an interface between the first and second waveguide portions. The mechanical barrier includes a first shaft section positioned within the first waveguide portion, a second shaft section positioned within the second waveguide portion and a raised annular shoulder positioned at the interface, within the process sealing cavity. The raised annular shoulder has a width, which is measured radially outward from an outside diameter of the shaft sections, of approximately 1/2 .lambda..sub.G and a height, which is measured axially between the first and second waveguide portions, of approximately 1/4 .lambda..sub.G.

REFERENCES:
patent: 3001160 (1961-09-01), Trousdale
patent: 3593224 (1971-07-01), Eggers et al.
patent: 5070730 (1991-12-01), Edvardsson
patent: 5279156 (1994-01-01), van der Pol
patent: 5495218 (1996-02-01), Erb et al.
patent: 5770990 (1998-06-01), Lubbers
"Guiding the way through Micropilot, Reliable microwave level measurement-even under extreme process conditions", Endress & Hauser Promotion SP 003F/00/e, Nov. 1993, pp. 1-8.

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