| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sediment outflow detector and a detector which can be installed at low cost and can distinctively receive alarms of each device even if a large number of devices give an alarm simultaneously.SOLUTION: The detector is disposed in sediment on a water bottom or in the proximity of a water channel in an installation state, and includes a housing, a spindle disposed on one side within the housing, and a signal transmission unit for transmitting a signal via an antenna disposed on a side opposite to the spindle within the housing; the specific-gravity of the whole housing including the spindle and the signal transmission unit being smaller than that of water, and the signal transmission unit transmitting different signals between the installation state and an outflow state or transmitting a signal only in the outflow state.</p> |
