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A viscometer is a physical analysis instrument for measuring fluid viscosity. Viscosity is a physical property of fluid substances, which reflects the internal friction between molecules when the fluid is subjected to external force. The viscosity of a substance is closely related to its chemical composition. In industrial production and scientific research, the composition or quality of substances is often monitored by measuring viscosity. For example, in the production process of polymer materials, the viscometer can be used to monitor the viscosity of the reaction product and automatically control the end of the reaction. Others such as oil cracking, lubricating oil blending, automatic production process control of certain foods and medicines, monitoring of crude oil pipeline transportation process, quality inspection of various petroleum products and paints, etc., all require viscosity measurement.

With the development of the times and the advancement of science and technology, viscometers have a certain share and potential in the current market. Viscometers are widely used to measure the dynamic viscosity of various fluids such as oils, paints, coatings, plastics, food, drugs, and adhesives.

The viscometer is very popular because of its simple structure, low price, convenience and practicality. Shanghai Ruifeng Instrument Manufacturing Co., Ltd. has been engaged in the verification process of such instruments for a long time. We found that many users, especially the testers of small and medium-sized enterprises, have many problems in the use process. requirements, but the user has a large deviation in the data when testing the sample. How to use this type of viscometer correctly to obtain accurate and reliable measurement results is analyzed as follows

After the rotational viscometer is turned on, the zero position must be detected first. This operation is generally carried out without installing the rotor, and then the inner cylinder of radius R2 is coaxially installed in the outer cylinder of radius R1, which is filled with viscous fluid. The synchronous motor Rotate at a stable speed, connect the scale discs one after another, and then drive the inner cylinder (ie the rotor) to rotate through the hairspring and the rotating shaft. The greater the torque generated by the counterbalance, the larger the scale indicated by the pointer on the dial. Multiply the reading by a specific factor to get the dynamic viscosity of the liquid.