With the demand for measurement in the development of industry, the advantages of electromagnetic flowmeters in measurement applications are becoming more and more obvious. Although the purchase cost of electromagnetic flowmeters is slightly higher than that of ordinary flowmeters, the performance and accuracy of electromagnetic flowmeters and a series of characteristics are not available in ordinary flowmeters.
Electromagnetic flowmeter has six major advantages:
1. Electromagnetic flowmeter is a volume flow measurement instrument. During the measurement process, it is not affected by the temperature, viscosity, density and conductivity (within a certain range) of the measured medium. Therefore, the electromagnetic flowmeter can be used to measure the cumulative flow and instantaneous flow of all conductive liquids after water calibration.
2. The electromagnetic flowmeter has no mechanical inertia and is sensitive to reaction. It can measure instantaneous pulsating flow and flow in both positive and negative directions.
3. There are no obstructing flow parts and no pressure loss in the measuring tube. The sensor structure of the electromagnetic flowmeter is simple, there are no moving parts in the measuring tube, and there are no throttling parts that hinder the flow of fluid. Therefore, when the fluid passes through the flowmeter, it will not cause any additional pressure loss. It is one of the flow meters with the lowest operating energy consumption.
4. It can measure food-grade media such as drinking water, milk, beer, etc., and can also measure the flow of sewage, wastewater, pulp, mud media, corrosive media and suspended liquid-solid two-phase flow. This is because there are no obstructive flow parts inside the measuring tube of the instrument, and only the measuring tube lining and electrodes are in contact with the measured fluid. The materials can be selected according to the properties of the measured fluid. Polytrifluoroethylene or polytetrafluoroethylene is often used as the lining, which can measure various corrosive media such as acids, alkalis, and salts; wear-resistant rubber is used as the lining, which is particularly suitable for measuring liquid-solid two-phase flows such as ore slurry and cement slurry with solid particles and large wear, as well as various suspended liquids such as fiber-bearing liquids and pulp.
5. The output of the electromagnetic flowmeter is only proportional to the average flow velocity of the measured medium, and has nothing to do with the flow state (laminar or turbulent) under symmetrical distribution. Therefore, the range of the electromagnetic flowmeter is extremely wide, and its measurement range can reach 100:1, and some even reach 1000:1 of the operable flow range.
6. The caliber range of industrial electromagnetic flowmeters is extremely wide, ranging from a few millimeters to several meters, and China currently has real flow calibration equipment with a caliber of 3m, which has laid the foundation for the application and development of electromagnetic flowmeters.