用它能连续测量60厘米高度范围内的液面变化，液面高度由数字表头直接显示出来。
Such a level sensor is capable of continuously measuring helium level within 60cm high, helium level is displayed directly on a digital meter.
在煤层气井排采过程中，通常用回声仪来监测环空液面变化，通过控制液面下降速度来实现稳定、连续降压。
The echometer was used to monitor the change of the annular water level in the coal- bed methane(CBM)wells production, which could decrease pressure stably and continuously.
通过将电压信号与壁面液膜形态进行对比，总结出判断液膜连续性的判据。
According to the comparison of voltage signals with the film pattern, the judgment for film continuity on the evaporating wall was achieved.
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