differential pressure indicator

例句：

1. 1. The differential pressureindicator is used to measure thedifference in pressure between two points.
   差压指示器用于测量两个点之间的压力差。
2. 2. The engineer used the differential pressureindicator to detect a leak in the pipeline.
   工程师使用差压指示器检测管道中的泄漏。
3. 3. The differential pressure indicator was usedto monitor the pressure changes in the oilwell.
   差压指示器被用来监测油井中的压力变化。