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

Abstract: The 17 key points that should be paid attention to in the engineering application of electromagnetic flowmeters are provided by excellent flowmeter and flowmeter production and quotation manufacturers. In petrochemical, chemical, electric power, metallurgy, municipal, pharmaceutical and other industries, the technical difficulty and complexity of flow measurement are quite high. The study of flow measurement plays an important role in improving product quality, reducing operating costs, and solving energy conservation and environmental protection. Electricity. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the 17 key points that should be paid attention to in the engineering application of electromagnetic flowmeters. In petrochemical, chemical, electric power, metallurgy, municipal, pharmaceutical and other industries, the technical difficulty and complexity of flow measurement are quite high. The study of flow measurement plays an important role in improving product quality, reducing operating costs, and solving energy conservation 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, there are still some problems in the actual use process. The following is a list of electromagnetic flowmeters for you. Points to note in engineering applications. 01 The transmitter should be installed at a position where the measuring conduit can be filled with liquid at any time to prevent the illusion that the pointer is not at the zero point due to no liquid in the measuring conduit. Vertical installation reduces errors due to air 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. 02If necessary, you can let the tube empty, the built-in empty tube detection circuit will stop the signal output of accumulation and flow. 03 When installing the electromagnetic flowmeter for the fluid flowing in the pipeline with anode protection, the following points should be followed: In order to make the fluid well grounded, a ground ring should be used; when the sensor is connected to the pipeline, there should be an insulating pad between the flanges , and insulating sleeves should also be used on the screws. 04 When the electromagnetic flowmeter is installed on a grounded metal pipe, the system potential balance is realized through the grounding terminal on the electromagnetic flowmeter transmitter, 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 flow The meter is installed on an ungrounded metal pipe, and 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; connect the transmitter or sensor junction box to the grounding terminal to achieve System potential balance; when the electromagnetic flowmeter is installed on a plastic pipe or a pipe with an insulating lining, the system potential balance is achieved 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. 05 The electromagnetic flow transmitter should be installed in a dry and ventilated place in the room, avoid installing it in a place where the ambient temperature is too high, and 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 transmitter. 06 In order to ensure that the measuring tube of the electromagnetic flow transmitter is filled with the measured medium, the variable device is 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. 07 Valves and bypasses should be installed at both ends of the electromagnetic flow transmitter. The AC potential of several millivolts measured by the electrode of the 08 electromagnetic flow transmitter is based on the liquid potential in the transmitter. In order to stabilize the liquid potential and keep the transmitter and the fluid at the same potential to ensure stable measurement, the transmitter casing and both ends of the metal pipe should be well grounded, the converter casing should also be grounded, and the grounding resistance should not be greater than 10 Ohm, can not be shared with the ground wire of other electrical equipment. If the transmitter housing cannot be guaranteed to be in good contact with the metal pipes, use metal wires to connect them and then ground them reliably. 09 In order to avoid interfering signals, the signal between the transmitter and the converter must be transmitted with shielded wires. It is not allowed to put the signal cable and the power cable in parallel in the same cable steel pipe, and the length of the signal cable should not exceed 30m in general. 10. The installation site of the converter should avoid strong AC and DC magnetic fields and vibration, the ambient temperature should be -20~50℃, and it should not contain corrosive gas, and the relative humidity should not be greater 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, and the rear straight pipe section should be 5D.
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