DEVICE AND METHOD OF MEASURING THE VISCOSITY AND/OR VISCO-ELASTICITY OF A FLUID

摘要

An apparatus for measuring the viscosity and/or visco-elasticity of a fluid comprises a measuring chamber (4) that can be filled with a standard fluid (3) and is provided with pressure generating means (5) and with pressure sensing means (6) and a measuring tube (8) connected through a flexible diaphragm (7) with the measuring chamber (4) for receiving the fluid (2) to be measured. For achieving an accurate measurement of the viscosity and/or visco-elasticity of unstable fluids, the measuring tube (8) is connected with the diaphragm (7) with the interposition of a coupling chamber (10) filled with a coupling fluid (9). The measuring tube (8) is mainly located at a lower level than the measuring chamber (4). The coupling chamber (10) has a first coupling compartment (11) which is connected with the measuring tube (8) and a second coupling compartment (12) which is adjacent the diaphragm (7) and which is laterally connected with the first coupling compartment (11).