rs485 communication electromagnetic flowmeter

Many small partners pay attention to its output mode when buying an electromagnetic flowmeter. Today I will introduce a RS485 communication electromagnetic flowmeter.　　 Before we talk about the RS485 communication electromagnetic flowmeter, let's first understand the principle of the electromagnetic flowmeter. The basic measurement principle of the electromagnetic flowmeter is based on Faraday's law of electromagnetic induction, that is, when a conductor cuts the magnetic line of induction in a magnetic field, an induced electromotive force is generated at its two ends. The measuring tube of the flowmeter is made of a short non-magnetic alloy tube lined with insulating material. Two electrodes are fixed on the measuring tube through the tube wall along the diameter direction of the tube, and the electrode tip is basically flush with the inner surface of the lining. When the excitation coil is excited by a two-way square wave pulse, it will generate a working magnetic field with a magnetic flux density of B in the direction perpendicular to the axis of the measuring tube. At this time, if a fluid with a certain conductivity flows through the measuring tube, it will cut the magnetic lines of force and induce The electromotive force E is output. The electromotive force E is proportional to the magnetic flux density B, and the product of the inner diameter d of the measuring tube and the average flow velocity v is measured. The electromotive force E (flow signal) is detected by the electrode and sent to the converter through the cable. After the converter amplifies the flow signal, it can display the fluid flow, and can output signals such as pulses and analog currents for flow control and adjustment.　　RS485 electromagnetic flowmeter is widely used in sewage, fluorine chemical, production water, tap water industry, medicine, steel and many other aspects. The principle determines that it can only measure conductive liquids. Although it is much better than other types of flowmeters in terms of reliability and stability, customers still have some problems in actual use. The following is a detailed description of the selection and installation of electromagnetic flowmeters: 　　一, Like other flow meters, although the measurement range ratio of RS485 electromagnetic flowmeter is 30:1, which is higher than that of vortex flowmeter and differential pressure flowmeter, it also has limitations. Compared with the water meter, it is thought that it can measure very low flow velocity. Under normal circumstances, it can only measure 0.3m/s. It is difficult to measure correctly if the electromagnetic flow rate is lower than this. Therefore, it is necessary to clarify the flow range ratio at the beginning of the order. When ordering, it is not possible to order according to the original pipe diameter. It is best to set the gauge diameter according to your actual flow.　　 Two, like other flowmeters, RS485 electromagnetic flowmeters also have requirements for straight pipes before and after installation, but they have lower requirements than other types of flowmeters, but the most critical point is to meet: full pipe, then full pipe. If the tube is not full, it is easy to cause the flowmeter to jump randomly: 　　Three, like other flowmeters, the RS485 electromagnetic flowmeter also has a protection level. Generally, the integrated type is IP65, and the split type is IP68 (for the sensor). The customer has requirements for the installation environment of the instrument. The installation location is in an underground well or some other humid place. It is recommended that the customer choose a split type. In order to avoid damage to the instrument caused by the wrong selection. Fourth, the RS485 electromagnetic flowmeter can measure corrosive liquids, but the customer should correctly provide other measuring medium properties at the beginning of the order, so as to avoid errors in the selection of the electrode during the selection, which will cause the sensor to be scrapped in the later use process, which will cause inconvenience to the customer. And economic losses.　　5. Although the reliability of RS485 electromagnetic flowmeter is relatively good, it will not be damaged under normal circumstances, but due to its principle, the surface of the sensor electrode has been in contact with the liquid. After a long time, the surface of the electrode is more likely to be contaminated. Therefore, in general, if the customer has the conditions to disassemble the electromagnetic flowmeter, it is recommended that the electrode be removed and cleaned once a year to a year and a half to ensure the measurement accuracy of the entire flowmeter. Any instrument needs 'maintenance　　 Six, when the main line is a vertical pipeline, under normal circumstances, the water flow is required to be bottom-up, and try not to be top-down. The latter is likely to cause relatively large flow fluctuations. In addition to the full pipe installation, this is also very important, followed by the distance between the front and rear straight pipes.　　 If you have any questions about the selection of RS485, you can consult Kaidi Sensing Technology Co., Ltd., a manufacturer specializing in the production of electromagnetic flowmeters, and there are professional technical engineers in-house to guide you in the selection. If you have technical problems, you can also have technical exchanges with them.
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