Selection principle and method of mass flowmeter (1)

Principles and methods of mass flowmeter selection (1) Mass flowmeters have 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 principle 1. Select the structure of the flowmeter according to the type of the measured fluid. There are many types of measuring tubes for the Coriolis force mass flowmeter, which need to be considered and selected according to the type of the measured medium. 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 certain 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 Considering the flow range, two principles should be followed: First, the flow range of Tianchen Borui 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 certain. If you blindly pursue to set the 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 unsafety. Increase. For some flammable and explosive media, if the flow rate is too high, it is 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.

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