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压力仪表基础知识

发布时间:2017-06-07 10:04:11 分类:行业新闻 来源: 点击:次

压力仪表基础知识 压力仪表基础知识   压力仪表的基础知识 1、 大气压:地球表面上的空气柱因重力而产生的压力。它和所处的海拔高度、纬度及气象状态有关。  2、 差压(压差):两个压力之间的相对差值。  3、 绝对压力:介质(液体、气体或蒸汽)所处空间的所有压力。绝对压力是相对零压力而言的压力。  4、 表压力(相对压力):如果绝对压力和大气压的差值是1个正值,那末这个正值就是表压力,即表压力=绝对压力-大气压>0。  5、 负压(真空表压力):和“表压力“相对应,如果绝对压力和大气压的差值是1个负值,那末这个负值就是负压力,即负压力=绝对压力-大气压<0。也称为真空度  6、 静态压力:1般理解为“不随时间变化的压力,或是随时间变化较缓慢的压力,即在流体中不受流速影响而测得的表压力值”。  7、

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