Ap measurements are considerably influenced by the volume of each part and the vacuum of the sealed mercury tube end of the Ap meter, insomuch that Ap measurements are in some cases unobtainable. 实践表明,△P测定仪各部分容积及水银压力计密封端的真空度对△P测值有较大影响,有时甚至因此测不出△P;
The principle and method of the measurement of the level inside sealed vessels as well as the system configuration of the level meter based on lamb wave are introduced. 介绍采用兰姆波测量密封容器内液体高度的原理、方法,以及兰姆波液位计的系统组成。