| 摘要 |
<p>A tank closing unit comprising a cover for closing an inlet and/or the outlet of the tank, and a detector comprising: a detector registration unit adapted to determine when the cover is moved relative to or removed from the inlet or outlet, and a detector transmitter unit adapted to transmit a signal when the cover is moved or removed. A system comprising the tank closing unit and an external receiver unit adapted to detect a signal transmitted form the detector transmitter unit.</p> |
