| 摘要 |
13 A self-contained, submerged apparatus for monitoring the height of a liquid above the apparatus includes a tube defining an upright conduit, a first chamber at the bottom of the conduit and communicating with it, a second chamber adjacent the first chamber and separated from it by a first impervious non-rigid membrane, the second chamber being defined in part by a second impervious non-rigid membrane in contact with the ambience. The second chamber contains a first liquid to which the membranes are inert, and the first chamber containing a second liquid to which the first membrane is inert. Pressure from the ambience exerted against the first membrane is transmitted to the second membrane and causes the second liquid to rise in the tube. The top of the tube is vented to the atmosphere, and electronics are provided for producing a signal which is a function of the height of the second liquid in the conduit.
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