Computer-Controlled Vibrating Tube Densimeter for Liquid Density Measurement in a Wide Temperature and Pressure Range

Abstract

A density measurement system was developed using a vibrating tube densimeter prototype for high temperature and high pressure (DMA-HDT). Fully automatic density measurements over a large temperature and pressure range were realized with the help of the specially developed controlling software. Currently, the unit is applicable for temperatures from 298 K to 523 K and pressures from atmospheric pressure up to 100 bar. The estimated total error in the density measurements is 0.0002 g/cm 3 .

Model-based Data Fusion in Industrial Process Instrumentation

“…An illustrative example that can be found throughout the process industries is density measurement. A classical instrument for that purpose is the vibrating tube densimeter (Ihmels et al, 2000) (Laznickova & Huemer, 1998). The operating principle based on a spring-mass system is sketched in figure 1 using a U-shaped tube.…”