Measuring and testing – Specific gravity or density of liquid or solid – With weighing feature
Patent
1988-04-22
1989-03-21
Chapman, John
Measuring and testing
Specific gravity or density of liquid or solid
With weighing feature
73437, G01N 908
Patent
active
048132837
ABSTRACT:
A density measuring apparatus (densitometer) useful for rapid absolute determination of the density, the temperature dependence of density, partial volume and thermal expansivity of condensed matter, based on the hydrostatic method, employs an electronic balance enclosed in an airtight envelope which forms a weighing chamber and a measuring chamber. The balance comprises a balance beam and measuring and weighing hangdown assemblies attached to opposite ends of the beam. The balance beam and the weighing hangdown assembly are positioned in the weighing chamber. The measuring hangdown assembly extends from the weighing chamber into the measuring chamber and comprises a thin suspension wire and a sample support or a sinker which are positioned in a multi-jacket measuring vessel adapted to receive a buoyant or sample liquid. A vapor barrier is provided between the weighing and measuring chambers to prevent vapors of the buoyant or sample liquid from flowing into the weighing chamber.
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O. Kratky et al., "Dichtmessungen an Fluessigkeiten und Gasen etc.", Z. Angew, Physik, vol. 27 (1969), pp. 273-277.
N. Bauer et al., "Determination of Density", In: Weissberger et al., Physical methods of Chemistry, vol. I, (Wiley-Interscience, New York, 1972), pp. 57-124.
O. Kratky et al., "The Determination of the Partial Specific Volume of Proteins by the Mechanical Oscillator Technique", Methods of Enzymology, vol. 27 (1973), pp. 98-110.
J. Fortier et al: "Direct Continuous Measurements of Thermal Expansion coefficients etc.", Review of Scientific Instruments, 50 (11), Nov. 1979, pp. 1474-1480.
Chapman John
Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.
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