| 摘要 |
The invention refers to a device for visually indicating the liquid level inside a tank comprising a float partially immersed in said liquid and vertically movable in the tank, and a visualisation system of the level of said liquid, characterised in that said visualisation system comprises: a) an at least partially transparent visualisation container, suitable for being positioned outside said tank; b) a visualisation liquid; and c) a measurement tube in said tank around which said float slides, and in which a piston tightly slides and separates an upper part filled with said visualisation liquid and a lower part. Said piston is joined by magnetic coupling means to said float. Said piston moves said visualisation liquid into or out the visualisation container according to the vertical position of the float. An additional communication tube links said lower part to atmospheric air or to the upper part of the visualisation container filled with a service liquid having a specific weight lower than the on of said visualisation liquid.
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