Selection principles and methods of mass flowmeters

Mass flowmeters have ultra-high precision and stable performance, and more manufacturers in the industry use mass flowmeters to measure the quality of fluids. When purchasing a mass flowmeter, the issue of type selection is very critical. The selection of mass flowmeters must pay attention to certain principles and methods in order to ensure normal use and maintenance in the future. 1. Selection principles 1. Select the structure of the flowmeter according to the type of fluid to be measured. There are many types of measuring tubes for Coriolis force mass flowmeters, which need to be considered and selected according to the type of medium to be measured. In principle, pure liquids with low viscosity have no requirements on the shape of the measuring tube; when measuring liquids containing a small amount of air bubbles, slurries containing solid particles, and high-viscosity liquids, the measuring tube should be selected so that it is not easy to accumulate air bubbles or solid particles, and the inner wall The shape of the medium that is not easy to adhere to; if it is used in the food industry, the measuring tube should be easy to clean. 2. Safety principles When measuring corrosive fluids, attention should be paid to the corrosion resistance of the measuring tube, and the sensor housing should also have a certain degree of corrosion resistance. In the event of a rupture of the test tube, safety precautions should be taken before handling. Different media have different corrosive properties, and different materials have different anti-corrosion objects, so they should be treated differently. When measuring abrasive media, the wear resistance of the measuring tube should be considered. When the process pressure is high, attention should be paid to the withstand voltage level of the sensor to avoid damage to the measuring tube; when the medium temperature is high, the operating temperature range of the sensor should be considered to avoid damage to the detection element. If the selected flowmeter is used in a hazardous area or harsh environment, special attention should be paid to the explosion-proof and protection level of the flowmeter should meet the requirements of safety standards. 3. Flow range Two principles should be followed when considering the flow range: First, the flow range of Zhonglong flowmeter should be able to cover the process flow range of the measured medium. Secondly, the common process flow should fall within the economic flow range of the flowmeter. The so-called economic flow range has two meanings here: one is because of the Coriolis force mass flowmeter, its zero point stability has a great influence on the measurement accuracy of the lower limit flow. The closer to the upper flow limit, the smaller the impact of zero stability on accuracy, therefore, the range of more than 1/3 of the upper limit flow of the flowmeter can be called the economic flow range of accuracy; the second is for the same type of flowmeter, if at the same time The measurable flow range of several calibers can cover the process flow range, and choosing a flowmeter with a smaller caliber can obviously save money and be more economical. But this kind of economy is not absolute. If you blindly pursue the use flow rate within the range close to the upper limit flow rate of the flowmeter, it will inevitably cause the flow rate of the medium in the measuring tube to be too high, and the negative effects will be excessive pressure loss and increased safety. . For some flammable and explosive media, if the flow rate is too high, it is very easy to cause deflagration due to static electricity generated by friction. Therefore, care should be taken not to exceed the safe flow rate for such media. 4. Accuracy The requirements for the accuracy level should be determined according to the measurement object and purpose. At the same time, attention should be paid to the calculation method of the product accuracy level and the use conditions or restrictive factors to achieve this level. Generally speaking, the Coriolis force mass flowmeter expresses the accuracy grade by the percentage of the flow reading with zero stability, and some products are expressed by the method that different flow segments correspond to different error limits, and some products are in the low flow rate segment. The error level is expressed as a percentage of full scale. For the Coriolis force mass flowmeter, when considering its accuracy level, the following two points should also be paid attention to: First, due to the particularity of the calculation method of the accuracy level of this type of flowmeter, some products give a very high accuracy level. Accuracy level, and the zero drift value given at the same time is also very high, thus increasing its allowable error limit; second, some products give a high accuracy level under low zero drift value, but the installation conditions it requires are close to Harsh and can only be done in a laboratory. Due to the ubiquity of on-site vibration and the limitation of the installation site, it is difficult to meet such installation conditions and achieve the theoretical effect. these two“high accuracy”Grades are not enough. In the case of meeting the measurement accuracy requirements, factors such as price should be considered, and it is not necessary to blindly pursue an excessively high accuracy level.

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