How to measure the liquid level in a tank with an internal floating roof using a horn antenna radar
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Currently, the height to which the internal floating roof naturally drops to the bottom is about 1.5 m; how can a horn-shaped radar be used to measure the liquid level? For example, when the liquid level is below 1.5 meters, the radar measures the height of the floating roof; the liquid level below the floating roof cannot be detected. Should the height of the floating roof be set as the zero liquid level?
Internal floating roof tanks usually have waveguide tubes, with the radar installed on these tubes; the waveguide tubes run through the floating roof all the way to the bottom of the tank. If there is no waveguide, then the problem you mentioned will occur; in such cases, a trade-off has to be made. Usually, the surface of the floating roof is measured, with the lowest point of the floating roof taken as the zero point. As for the lower part, it remains fixed, or its value can be fixed through system logic by adding 1.5 meters to the measurement value