Rotational viscometers are used to measure the viscous resistance of liquids and the dynamic viscosity of liquids. Widely used in the determination of the viscosity of various liquids such as oil, paint, plastic, food, medicine, cosmetics, adhesives, etc. Factors affecting the Rotational Viscometer are as follows.
Rotary viscometer rotor cleaning
Pay attention to the cleaning method of the rotor. It can be used for immersion in suitable organic solvents, not suitable for metal knives etc., because the rotor surface has severe scratches which will lead to deviation in the measurement results.
The depth of the rotor immersed in the liquid and the influence of air bubbles
Digital Rotational Viscometers have stringent requirements. The deep rotor immersed in the liquid needs to be manually operated as required (some binocular liquids have strict requirements on the test instrument and need to be measured with a graduated cylinder). During this process, the rotor is soaked in liquid, often foaming. After most of the rotors have been spinning for a while, the foam will disappear. Sometimes the foam cannot be eliminated, and the rising air bubbles attach to the rotor below. The existence of foam will bring a large deviation to the measurement data, so slowly tilting the rotor is an effective method.
Other issues that should be paid attention to in Rotational Viscometer
1. Some instruments are used to protect the frame. Read the instructions carefully and install according to the regulations, otherwise it will cause reading deviation.
2. After adjusting the liquid level of most of the gauges, replace the rotor. The rotor and the adjustment stage will be concerned about the problems in the measurement process at any time, otherwise it will cause reading deviation or even fail to read.
3. When measuring non-Newtonian fluids similar to Newtonian fluids, the speed and time after rotor rotation should be selected according to regulations, so as not to misunderstand the instrument. In short, although the Rotational Viscometer has a simple structure and is easy to use, if it is not used properly, accurate measurement results cannot be obtained once the instrument is calibrated, which will affect the quality of the product.
With the development of science and the improvement of industrial production level, the measurement of material viscosity is particularly important. Digital Rotational Viscometers can be used to measure the viscosity and flow characteristics of polymer liquids. Since most polymers are processed under viscous flow conditions, it is very important to grasp the performance law of viscous flow state for the determination of polymer viscosity in the process of polymer production.
