Force Transmission Error Analysis for a High-Pressure Single-Sinker Magnetic Suspension Densimeter
Date
2010-01-05Author
Cristancho, DiegoMantilla, Ivan
Ejaz, Saquib
Hall, Kenneth R
Iglesias Silva, Gustavo
Atilhan, Mert
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Show full item recordAbstract
The magnetic suspension densimeter (MSD) is a sophisticated, stateof-
the-art device that provides extremely accurate results for density measurements.
The MSD uses a magnetic technique to couple a mass inside a measurement cell
with an external mass balance for mass measurement. This article presents a force
transmission error (FTE) analysis for a high-pressure, single-sinker MSD. Due to the
magnetic working principle of the apparatus, magnetic properties of the high-pressure
cell and external magnetic fields affect the measurements slightly. For the analysis,
McLinden et al. suggest making measurements using two different sinkers, a titanium
sinker and a copper sinker, having the same mass. The measurements cover densities
for methane, ethane, carbon dioxide and nitrogen over the temperature range from
265K to 450K (±5 mK stability) up to 180MPa (uncertainty of 0.01% full scale:
200MPa). Comparing and manipulating the measurements permit determination of
apparatus and fluid specific effects that contribute to the FTE. For this MSD, the
apparatus effect is about 200 ppm, which effectively masks any fluid specific effect.
A comprehensive analysis of the FTE produces a uniform deviation for density values
of about 0.05% at 2σ across the full range of pressure.
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