| 摘要 |
According to one example embodiment, an apparatus may include a chamber, a flotation device inside the chamber, a magnetic sensor circuit, a timing circuit, and a switch circuit. The chamber may be configured to receive water through a first opening and allow water to exit through a second opening. The chamber may also be configured to prevent water from exiting the chamber other than through the first opening or the second opening. The flotation device may include a magnetic material. The magnetic sensor circuit may be configured to determine whether the flotation device is in proximity with a top portion of the chamber. The magnetic sensor circuit may be configured to output a water level signal to a timing circuit based on the determining. The timing circuit may be configured to output an alarm signal to a switch circuit based on the water level signal continually indicating a low water level for a predetermined period of time. The switch circuit may be configured to remove power from an external device based on the alarm signal.
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