| CPC G01F 23/296 (2013.01) | 8 Claims |
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1. A liquid level gauge and waveguide set, comprising:
a liquid level gauge installed on a vertical wall of a sewer, so that a radar wave or ultrasonic wave emitted by a liquid level detection module of said liquid level gauge is directed towards a sewage pipeline embedded in a ditch on a bottom surface of said sewer for liquid level sensing; and
a waveguide comprising a hollow tube body installed and fixed on said vertical wall of said sewer with one end thereof facing said liquid level detection module of said liquid level gauge, an exhaust branch pipe extending obliquely upward from a top wall of said waveguide opposite to said liquid level gauge and communicating with the inner space of said waveguide, said exhaust branch pipe being used to reduce and eliminate the air inside said waveguide when the liquid level rises, and prevent water vapor from condensing on the inner wall of said waveguide to affect the accuracy of said liquid level gauge, said waveguide having an opposite end thereof facing said sewage pipeline, so that the radar wave or ultrasonic wave emitted by said liquid level detection module is reflected by the inner wall of said waveguide and touches the liquid surface covering the periphery of said sewage pipeline, and is transmitted back through the inner wall of said waveguide to said liquid level detection module to obtain liquid level data.
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