| 摘要 |
PURPOSE: An alarm machine for empty draft beer barrel is provided to notice the discharge of carbon dioxide with an external LED and a buzzer by detecting the carbon dioxide discharged form a draft beer barrel with an internal sensor. CONSTITUTION: An alarm machine for empty draft beer barrel comprises an on-off switch(20) and a sensor. The on-off switch is used for a body. The sensor is used for the body and classifies the flow of draft beer and carbon dioxide. An LED is arranged on the body.
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