Electromagnetic flowmeters are flowmeters that display the flow rate by measuring the average velocity of a conducting fluid in a non-magnetic pipe, based on the law of electromagnetic induction.
Electromagnetic flowmeter advantages
1. The electromagnetic flowmeter has a large scale of measurement, usually 20:1 to 50:1, with a wide range of optional flow rates. The full-scale liquid flow rate can be selected within 0.5 to 10 m/s. Some models can be calibrated in the field according to the need to expand and reduce the flow (for example, set the instrument constant with a 4-digit potentiometer) without offloading for offline flow calibration.
2. The size of the electromagnetic flowmeter is wider than other types of flowmeters, from a few millimeters to 3 meters. Positive and negative bi-directional flow can be measured, and pulsating flow can also be measured. Only the pulsation frequency is lower than the excitation frequency. Instrument input is essentially linear. The variety of materials that are easy to choose from with the fluid contact can be used for aggressive fluids.
3. The measurement channel of the electromagnetic flowmeter is a lubricating straight pipe with no obstructing flow detection part. It is not easy to block and is actually used to measure liquid-solid two-phase fluids containing solid particles or fibers, such as pulp, coal water slurry, pulp, mud and sewage, etc. .
4. The electromagnetic flowmeter does not suffer from pressure loss caused by the detection of flow. The resistance of the instrument is only the resistance along the same length of the pipeline, and the energy-saving consequences are obvious. It is most appropriate to request a large-diameter water supply pipeline with low resistance loss.
5. The electromagnetic flowmeter has no mechanical inertia and sensitive response. It can measure the instantaneous pulsating flow, and can also measure the flow in both positive and negative directions.
6, electromagnetic flowmeter is due to the induced voltage signal is formed in the entire space filled with magnetic field, is the average value on the surface of the pipeline, so the sensor requires a straight pipe section is shorter, the length of the pipe diameter is 5 times.
7. The electromagnetic flowmeter is a non-blocking part in the measuring pipe, so there is no additional pressure loss; there are no moving parts in the measuring pipe, so the sensor life is extremely long.
8. 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 impede the flow of fluid. Therefore, when the fluid passes through the flow meter, it will not cause any additional pressure loss, and is one of the lowest energy consumption flow meters in the flow meter.
9. The volumetric flow rate measured by the electromagnetic flowmeter is practically not influenced by changes in fluid density, viscosity, temperature, pressure, and electrical conductivity (only above a certain threshold). Compared with the rest of the large flow meters, the straight forward pipe segment request is lower.
10. Measure the flow rate of fouling medium, corrosive medium and suspension liquid-solid two-phase flow. This is due to the unobstructed flow components inside the instrument measuring tube. The measuring tube lining and electrodes are in contact with the measured fluid. The material can be selected according to the nature of the measured fluid. For example, polytetrafluoroethylene or Teflon liners can be used to measure a variety of corrosive media such as acids, alkalis, and salts; wear-resistant rubber liners are particularly suitable for measuring wear with solid particles. Larger slurry, cement slurry, etc. Liquid-solid two-phase flow, and various suspended liquids with fiber liquids and pulps.
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