17 points to pay attention to in the application of electromagnetic flow meter

Abstract: The 17 key points that should be paid attention to in the application of electromagnetic flowmeters are provided by excellent flowmeter and flowmeter manufacturers. 17 points to pay attention to in the application of electromagnetic flowmeters Electromagnetic flowmeters in petrochemical, chemical, electric power, metallurgy, municipal, pharmaceutical and other industries, the technical difficulty and complexity of flow measurement are quite high. Enterprise. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the 17 key points that need to be paid attention to in the application of electromagnetic flowmeters. 17 points to pay attention to in the application of electromagnetic flowmeters Electromagnetic flowmeters in petrochemical, chemical, electric power, metallurgy, municipal, pharmaceutical and other industries, the technical difficulty and complexity of flow measurement are quite high. It plays an important role in the operating cost of the enterprise and solving the problem of energy saving and environmental protection. The electromagnetic flowmeter has the advantages of no resistance and no pressure loss, which can fully reduce the resistance in the pipeline and meet the requirements of energy saving and consumption reduction. Therefore, the electromagnetic flowmeter has received extensive attention in the industry. However, although the electromagnetic flowmeter has the above advantages, and is much better than most other types of flowmeters in terms of reliability and stability, some problems will still occur in the actual use process. Let's take a look at the main points that need to be paid attention to in the application of electromagnetic flowmeter. 1. The electromagnetic flowmeter sensor should be installed at a position where the measuring conduit can be filled with liquid at any time, so as to prevent the illusion that the pointer is not at the zero point due to the absence of liquid in the measuring conduit. It is best to install vertically to reduce errors due to bubbles on the electrodes due to liquid flow. If placed horizontally, the two electrodes of the flowmeter must be kept at the same level, in order to prevent sediment or air at the top of the pipe to insulate it. 2. If necessary, you can let the pipe empty, the built-in empty pipe detection circuit will stop the signal output of accumulation and flow. 3. For the fluid flowing in the pipeline with anode protection, the following points should be followed when installing the electromagnetic flowmeter: In order to make the fluid ground well, a ground ring should be used; when the sensor is connected to the pipeline, there should be insulation between the flanges Pads, and insulating sleeves should also be used on the screws. 4. When the electromagnetic flowmeter is installed on the grounded metal pipeline, the system potential balance is realized through the grounding terminal on the electromagnetic flowmeter sensor, that is, the copper core wire with a cross-sectional area of ​​not less than 6mm2 is connected to the grounding terminal; when the electromagnetic flowmeter is connected to the grounding terminal Installed on an ungrounded metal pipe, the two flanges are connected to the pipe flange through a copper core wire with a cross-sectional area of ​​at least 6mm2, and grounded; the converter or sensor junction box is connected to the ground terminal to realize the system potential Balance: When the electromagnetic flowmeter is installed on a plastic pipe or a pipe with an insulating lining, the system potential can be balanced by an additional grounding ring, which is connected to the grounding terminal through a copper core wire with a cross-sectional area of ​​at least 6mm2. 5. The electromagnetic flowmeter converter should be installed in a dry and ventilated place indoors. Avoid installing it in a place where the ambient temperature is too high. It should not be subjected to strong vibration. Try to avoid equipment with strong magnetic fields, such as large motors, transformers, etc. In the case of corrosive gas, the installation site is convenient for maintenance, which is the environmental condition to ensure the normal operation of the converter. 6. In order to ensure that the measuring tube of the electromagnetic flow sensor is filled with the measured medium, the sensor is best installed vertically, and the flow direction is bottom-up, especially for liquid-solid two-phase flow, it must be installed vertically. If only horizontal installation is allowed on site, it must be ensured that the two electrodes are on the same horizontal plane. 7. Valves and bypasses should be installed at both ends of the electromagnetic flow sensor. 8. The AC potential of several millivolts measured by the electrodes of the electromagnetic flowmeter sensor is based on the potential of the liquid in the sensor. In order to stabilize the liquid potential and keep the sensor and the fluid at the same potential to ensure stable measurement, both ends of the sensor casing and the metal tube should be well grounded, and the converter casing should also be grounded. The grounding resistance should not be greater than 10 ohms and cannot be The ground wire of other electrical equipment is shared. If the sensor housing cannot be guaranteed to be in good contact with the metal pipes, use metal wires to connect them and then ground them reliably. 9. In order to avoid interfering signals, the signal between the sensor and the converter must be transmitted with shielded wires. It is not allowed to put the signal cable and the power line in the same cable steel pipe in parallel, and the length of the signal cable should generally not exceed 30m. 10. The installation site of the sensor should avoid strong AC and DC magnetic fields and vibration. The ambient temperature is -20~50℃, and it cannot contain corrosive gas, and the relative humidity is not more than 80%. 11. In order to ensure the normal operation of the electromagnetic flowmeter and reduce the measurement error, the front and rear of the electromagnetic flowmeter should meet certain requirements for straight pipe sections. According to the test standard requirements of JJG 1033-2007 'Electromagnetic Flowmeter Approval Regulations', usually the front straight pipe section should reach 10D,The straight back section shall be 5D.
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