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一、概述本文介绍一种结构新颖的大量程精密液体压力计,它已通过国家鉴定,定为二等标准液体压力计。其测量范围0～25kPa(0～2500mmH_2O),不确定度为士0.05％;分辨率≤1Pa(0.1mmH_2O)。本仪器由于采用了随动刻尺和光学放大读数系统,使操作者可坐在影屏前观察压力的变化,大大方便了操作与观测。这对于读数高达2500mm的精密液体压力计来讲应是一种创新,改变了过去那种随液面高度升降读数的繁琐方法,在一定意义上提高了测量准确度。二、仪器工作原理如图1所示,测量部分由粗、细各一根测量管组成。粗管内装有一个玻璃浮子,下面系着一个精密玻璃刻尺,刻尺和浮子可随液面上下运动,称为随动刻尺。随动刻尺上的刻线和
I. Overview This article describes a novel structure of large-scale precision liquid pressure gauge, which has passed the national identification, as the second-class standard liquid pressure gauge. The measurement range 0 ~ 25kPa (0 ~ 2500mmH_2O), the uncertainty of ± 0.05%; resolution ≤ 1Pa (0.1mmH_2O). The instrument due to the use of follow-up optical and optical zoom reading system, so that the operator can sit in front of the screen to observe the pressure changes, which greatly facilitates the operation and observation. This should be an innovation for precision liquid manometers up to 2500mm readings, changing the cumbersome methods of reading and lowering the height with the liquid level in the sense of improving the measurement accuracy to a certain extent. Second, the working principle of the instrument shown in Figure 1, the measurement of the part from the coarse, fine one measuring tube. Thick tube equipped with a glass float, below the Department of a precision glass scale, scale and float with the liquid up and down movement, known as the follow-up scale. Follow the ruler on the scale and