A new version of vibrating-tube flow densitometer for measurements at temperatures up to 730 K

A new version of a vibrating-tube densitometer for determining the difference between densities of two fluids is described. The new design made it possible to obtain reliable values in regions of higher compressibility. The main new features were a (platinum + rhodium) alloy for all the tubing in th...

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Bibliographic Details
Published in:The Journal of chemical thermodynamics 1991-04, Vol.23 (4), p.333-344
Main Authors: Majer, Vladimir, Crovetto, Rosa, Wood, Robert H.
Format: Article
Language:English
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Summary:A new version of a vibrating-tube densitometer for determining the difference between densities of two fluids is described. The new design made it possible to obtain reliable values in regions of higher compressibility. The main new features were a (platinum + rhodium) alloy for all the tubing in the high-temperature zone and a new design of the vibrating-tube assembly. An electronic circuit used a phase-locked loop to drive the tube making it possible to get a stable pick-up signal even at high temperatures where noise from the heater was high. Temperature and pressure control were improved to ±0.02 K and ±0.01 MPa over an extended beriod of time. The density differences which could be detected varied from ≈0.08 kg·m −3 at 600 K to ≈0·14 kg·m −3 at 670 K.
ISSN:0021-9614
1096-3626
DOI:10.1016/S0021-9614(05)80088-6