Switching device and a liquid level detection apparatus employing the switching device

A switching device, comprising:

• a first enclosure, containing a switch;
• a second enclosure, having a second end connected to the first enclosure, the second enclosure having a rod shape;
• a detector unit, disposed in the second enclosure, including a first position sensor located at a first position, a second position sensor located at a second position, and detection circuit coupled to the first position sensor, the second position sensor and the switch;
• and
• a float, disposed around an exterior of the second enclosure, and configured to move along the second enclosure;
• wherein as the float moves from a first end of the second enclosure toward the second end of the second enclosure, when the float enters a first position range, the first position sensor is configured to sense the float and transmits a first sensing signal to the detection circuit;
• when the float enters a second position range, the second position sensor is configured to sense the float and transmits a second sensing signal to the detection circuit;
• wherein the detection circuit is configured to close the switch in response to the second sensing signal;
• wherein the first position range is a sensing range of the first position sensor, and the first position is within the first position range, and wherein the second position range is a sensing range of the second position sensor, and the second position is within the second position range.