Density under pressure

Density measurements are performed by means of a Kratky-apparatus, which consists of a tube-shaped bending-type oscillator of known volume. The oscillator is filled with a liquid and is stimulated to oscillate. After calibration of the measuring cell with two liquids of known density, the density of the fluid under investigation can be determined via the measured resonance frequency.
With our equipment we are able to measure the density of liquids up to 400bar in the temperature range of 15 - 150°C. Via the empirical Tait equation the measured values can normally be extrapolated reliably up to at least 1000bar.

 

Schema of the tube-shaped bending-type oscillator