METHOD OF DETERMINING VISCOSITY AND DENSITY OF LIQUID AND APPARATUS THEREFOR Russian patent published in 2015 - IPC G01N11/12 

FIELD: chemistry.

SUBSTANCE: method includes continuously measuring viscosity of a liquid during movement thereof. Viscosity and density of the liquid are measured in a stream of the liquid moving with a given constant bulk speed through a measuring pipe. Viscosity of the liquid is measured by transferring the pressure of the liquid to a pressure sensor through a sealed membrane 5. The method is carried out using a device comprising a measuring pipe 1 built into a process scheme, said pipe having a flange 4 for mounting the pressure sensor 2. The pipe is fitted with a double-arm lever 3 with different arm length, mounted on an axis with limited rotation in the vertical plane, wherein the long arm of the lever is located inside the pipe and can come into contact with a support 8, mounted on the inner surface of the pipe for limited rotation thereof. The short arm rests on the sealed membrane 5 placed on the flange of the pipe and comes into contact with the elastic element 6 of the pressure sensor 2 through the membrane. The pressure sensor 2 used is a resistive strain gauge. A signal from the pressure sensor 2 is transmitted to a secondary signal converter 7. The size of the pipe before the sensor is not less than l1=10d, and l2=5d after the sensor.

EFFECT: continuous measurement of viscosity of a liquid during a process for the entire duration of the process directly on an apparatus, for liquids whose viscosity varies with time over a wide range, including high-viscosity liquids.

5 cl, 1 dwg