| 摘要 |
<p>The device has a main body (1) with a non magnetic wall (7) separating internal and external faces of the body. A magnetic metal insert (6) is located in a side of the external face. The insert is immersed in fluid of a metallic structure in the form of open/closed circuit, and loses a part of its mass by corrosion. A proximity sensor e.g. magnetic sensor, is located in a side of the internal face and separated from the insert by the wall. The sensor interacts with the insert as long as mass of the insert does not decrease below critical quantity corresponding to a preset corrosion threshold. The wall is sealed to the fluid and made of non-conductive polymers or ceramics.</p> |
