| 摘要 |
<p>An audible low-fuel alarm (50) for a pressurized propane fuel tank is disclosed. A Hall-effect sensor (57) is mounted in relation to a magnet (35) which is rotated in response to the level of fuel within the propane tank. When magnet (35) is rotated to a position to indicate a low fuel condition, the Hall-effect sensor (57) activates a buzzer 53. A mercury switch (55) prevents false low fuel alarms and conserves battery power during inflation of the balloon envelope.</p> |
