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Rotary viscometer with high measurement sensitivity

- May 31, 2018 -

The digital rotary viscometer is a 16-bit high-performance single-chip microcomputer intelligent instrument that completely changed the previous gear speed control method. The step motor is set to operate accurately and smoothly according to the program. The torque sensor drives the rotor to rotate at a constant speed. When the rotor is subjected to viscous resistance in the liquid to be measured, it is detected and processed, and the viscosity of the liquid to be measured is displayed on the screen.


Compared with the same rotary viscometer, the rotary viscometer has high measurement sensitivity, good anti-interference performance, wide working voltage (110V-220V, 50HZ-60HZ can be) reliable test results, easy operation, elegant appearance, etc. The instruments used to measure the absolute viscosity of Newtonian liquids and the apparent viscosity of non-Newtonian liquids can be used for the measurement of viscosity of various objects such as greases, paints, plastics, pharmaceuticals, jewelry, and coating detergents.


A common rotary viscometer is a cone-plate viscometer. It mainly consists of a flat plate and a cone plate. The motor drives the plate to rotate at a constant speed by the speed change gear, relying on the capillary action to keep the tested sample between the two plates, and to drive the cone plate to rotate by the friction between the molecules of the sample. Under the action of the torsion spring in the torque detector, the cone plate does not rotate after being rotated by a certain angle. At this point, the torque applied by the torsion spring is related to the intramolecular friction (ie, viscosity) of the sample under test: the higher the viscosity of the sample, the greater the torque. The torque detector is provided with a variable capacitor whose rotor rotates with the cone plate, thereby changing its own capacitance value. The torsion spring torque reflected by this change in capacitance is the viscosity of the sample under test, which is shown by the rotational viscometer.

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