Abstract
A rolling ball viscometer has been developed for use at high pressures up to 1 GPa. It is proved that the calibration coefficient of the viscometer depends on its inclination angle and this dependence varies with the diameter ratio of the ball and tube. Improvement is made in order to allow simultaneous measurement of the density by assembling a potentiometric displacement meter. The precision of the density measurement is estimated to be ±0.22%. The viscosity data of di-(2-ethyl-hexyl) sebacate (Univis P12) is presented in the range of pressures up to 800 MPa at temperatures from 6 to 60°C. The accuracy of the viscosity measurement is estimated to be ±0.95%.
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