Abstract
A manually operated Burnett apparatus has been converted into a semiautomated Burnett–isochoric PVT facility. An automated pressure injector with dedicated control logic nulls a sensitive differential pressure indicator. A microcomputer is used in setting the control temperature, monitoring equilibration, measuring temperature and pressure, processing the raw data, and storing the information. The quality of the apparatus is demonstrated by means of a low-density and a high-density isochore obtained for a geothermal working fluid mixture in one-phase, two-phase, and supercritical regimes, including a dew and a bubble point.
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