underflow indicator

例句：

1. 1.The underflow indicator is used to monitor the level of liquid in the pipeline.
   下溢指示器用于监测管道中液体的水平。
2. 2.The engineers installed a new underflow indicator at the pump station.
   工程师们在泵站安装了一个新的下溢指示器。
3. 3.The underflow indicator was used to detect any potential leaks in the pipeline system.
   下溢指示器被用来检测管道系统中的任何潜在泄漏。