How much does an electromagnetic flowmeter cost

Electromagnetic flowmeters are often used to measure sewage, wastewater, and circulating water in industrial production. They are an indispensable part of the flow measurement of industrial production. Then, everyone must be very concerned about how much electromagnetic flowmeters cost. The following editor will focus on electromagnetics. How much does a flowmeter cost? Let me introduce the factors related to the price of electromagnetic flowmeters.　　 Before starting, let me introduce the basic principle of electromagnetic flowmeter.　　The principle of electromagnetic flowmeter is based on Faraday's law of electromagnetic induction. That is, when the conductor cuts the magnetic field line movement in the magnetic field, an induced electric potential will be generated in the conductor. The magnitude of the induced electric potential is proportional to the effective length of the conductor in the magnetic field and the speed of the conductor moving perpendicular to the direction of the magnetic field in the magnetic field. In the same way, when the conductive fluid flows in the vertical direction in the magnetic field to cut the magnetic induction force lines, it will also generate an induced electric potential on the electrodes on both sides of the pipeline.　　The volume flow rate is equal to the product of the fluid velocity v and the pipe cross-sectional area (πD²)/4. When the pipe diameter D is fixed and the magnetic induction intensity B remains unchanged, the measured volume flow rate has a linear relationship with the induced potential. If an electrode is inserted on each side of the pipe, an induced electric potential can be introduced, and the volume flow can be obtained by measuring the magnitude of this electric potential.　　 After understanding the basic principles of electromagnetic flowmeters, we need to know the key points of electromagnetic flowmeter selection, because only after the electromagnetic flowmeter parameters are determined, we can know how much the electromagnetic flowmeter costs.　　The following are the 3 major elements of electromagnetic flowmeter selection. 　　1. Accuracy grade and function　　 There are big differences in the performance of general-purpose electromagnetic flowmeters on the market. Some have high accuracy and many functions, and some have low accuracy and simple functions. The basic error of the instrument with high precision is (±0.5%～±1%)R, and the instrument with low precision is (±1.5%～±2.5%)FS. The price difference between the two is 1 to 2 times. The functions of electromagnetic flowmeters are also very different. The simple one is to measure the one-way flow rate, and only output the analog signal to drive the rear position instrument; the multi-function instrument has two-way flow measurement, range switching, upper and lower limit flow alarms, empty pipe and power cut-off alarms. , Small signal removal, flow display and total calculation, automatic check and fault self-diagnosis, communication with upper computer and motion configuration, etc. The serial digital communication function of some models of instruments can choose a variety of communication interfaces and special-purpose chips (ASIC) to connect to the HART protocol system, PROFTBUS, Modbus, CONFIG, FF fieldbus, etc.　　2. Velocity, full-scale flow, range and caliber 　　The caliber of the instrument selected on site may not be the same as the pipe diameter, it should be determined by the flow rate. In the process industry, water and other liquids with different viscosities are transported, and the pipeline flow rate is generally 1.5 to 3m/s at an economical flow rate. The electromagnetic flowmeter is used on such a pipeline, and the sensor caliber is the same as the pipe diameter. The liquid velocity of the electromagnetic flowmeter can be selected in the range of 1～10m/s at the full scale flow, and the range is relatively wide. The upper limit flow rate is not limited in principle, but it is usually recommended not to exceed 5m/s, unless the lining material can withstand the scouring of the liquid flow, the actual application rarely exceeds 7m/s, and it is even rarer to exceed 10m/s. The lower limit of the flow velocity of the full-scale flow is generally 1m/s, and for some models, it is 0.5m/s.　　3. Liquid conductivity 　　The premise of using an electromagnetic flowmeter is that the liquid to be measured must be conductive and cannot be lower than the threshold (ie, the lower limit). If the conductivity is lower than the threshold, it will cause measurement error until it can’t be used. If it exceeds the threshold, it can be measured even if it changes. The indication error does not change much. The threshold of general electromagnetic flowmeter is 10-4～(5×10-6)S/cm Between, depending on the model. When used, it also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The manufacturer's instruction manual usually specifies the length of the signal line corresponding to the conductivity. The non-contact capacitive coupling large-area electrode meter can measure liquids with conductivity as low as 5×10-8S/cm. The conductivity of industrial water and its aqueous solution is greater than 10-4S/cm, and the conductivity of acid, alkali, and salt solution is between 10-4～10-1S/cm. There is no problem in using it. Low-degree distilled water is 10-5S/cm. There is no problem with cm. Petroleum products and organic solvents cannot be used if the conductivity is too low. The above three points are the matters needing attention in the selection of electromagnetic flowmeter. If you want to know how much the electromagnetic flowmeter needs, only after understanding the on-site working conditions and determining the parameter configuration of the electromagnetic flowmeter can you have a more accurate selection and quotation. . I believe that how to correctly choose the right electromagnetic flowmeter is far more important than how much money is needed for electromagnetic flow.
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