论文部分内容阅读
一、引言在许多生产过程控制应用中,经常需要有一种灵活且可靠的方法来测量液体的比重(SG)。但当液体粘度很高或必需保持在高温下时,这些测量变得很困难。本文对这一需要提出一种良好的方法。这个方法是使一远距密封差压(DP)仪表能给出正比于液体密度的4～20mA 的信号。正确
I. INTRODUCTION In many process control applications, it is often necessary to have a flexible and reliable method for measuring the specific gravity (SG) of liquids. However, these measurements become difficult when the viscosity of the liquid is high or must be kept at high temperatures. This article proposes a good approach to this need. This method is to make a Remote Seal Differential Pressure (DP) meter give a 4-20 mA signal proportional to the density of the liquid. correct