Electromagnetic flow meter shows the cause and treatment of negative value and the selection of electrode

Abstract: The reason and treatment of negative value displayed by electromagnetic flowmeter meter and the selection information of electrode are provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Electromagnetic flowmeters are widely used in the flow detection of conductive liquid media. The following is a brief introduction by the technicians of Jiangsu Jinhu Dahua Instrument Factory to the reasons and treatment methods if the flow rate shows negative values ​​during installation or operation of the electromagnetic flowmeter. Electromagnetic flowmeter flow. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the reasons for the negative value of the electromagnetic flowmeter meter and its treatment, as well as the details of the selection of the electrode. Electromagnetic flowmeters are widely used in the flow detection of conductive liquid media. The following is a brief introduction by the technicians of Jinhu Dahua Instrument Factory to the reasons and treatment methods if the flow rate shows negative values ​​during installation or operation of the electromagnetic flowmeter. There may be the following reasons for the negative flow display of the electromagnetic flowmeter: 1. The sensor is not installed according to the flow direction mark, causing the measurement direction to be opposite. Solution: Reinstall. 2. The signal line of the sensor is reversely connected. Since the electromagnetic flowmeter has the function of measuring the flow in the forward and reverse directions, the reverse flow is displayed. Solution: Replace the signal line. 3. The measurement pipeline is empty or not filled, and there is gas. At this time, the flow meter will display a negative number or the flow value fluctuates. Treatment method: Fill the pipeline with the measured medium, so that the flowmeter has the measurement conditions. Selection of materials for electromagnetic flowmeter and fluid contact parts: The electromagnetic flowmeter sensor parts in contact with fluid include lining (or measuring tube made of insulating material), electrode, grounding ring and sealing gasket. , wear resistance and the upper limit of the use temperature affect the adaptability of the instrument to the fluid. Due to the few parts, simple shape and flexible material selection, the electromagnetic flow sensor has strong adaptability to fluids. Electromagnetic flowmeter lining materials (or measuring tubes directly in contact with the medium) commonly used electromagnetic flowmeter lining materials include fluoroplastics, polyurethane rubber, neoprene rubber and ceramics. Fluoroplastics include polytetrafluoroethylene (F-4), perfluoroethylene propylene (tetrafluoroethylene and hexafluoropropylene copolymer, F-46; foreign trade name TeflonFEP, commonly known as FEP), tetrafluoroethylene and ethylene copolymer ( F-40) and perfluoroalkyl vinyl ether copolymer (modified polytetrafluoroethylene, foreign trade name TeflonFEP) glass fiber reinforced plastics are used as linings, and there are also separate measuring tubes. This year, Chen Li was made of high-purity alumina (99.7% A12O3) ceramics, but only for small and medium-caliber sensors. Neoprene and FRP are used for non-corrosive or weakly corrosive liquids, such as industrial water, waste water and acid and alkali, and the price is the cheapest. Fluoroplastics have excellent chemical resistance to turbid liquids, but poor wear resistance and cannot be used to measure mineral slurries. The earliest reference to fluoroplastics is polytetrafluoroethylene, which cannot be used in negative pressure pipelines because it is only pressed against the measuring tube of the electromagnetic flowmeter and has no adhesive force. Later, various modified varieties were developed to realize injection molding. The measuring tube has strong binding force and can be used for negative pressure. The material name of electromagnetic flowmeter (abbreviation or common name in parentheses) polyurethane rubber has excellent wear resistance, but the corrosion resistance of acid and alkali is poor. Its wear resistance is equivalent to 10 times that of natural rubber, and it is suitable for coal slurry, ore slurry, etc.; the medium temperature should be lower than 40 ~ 60/70 ℃. Alumina ceramic has excellent wear resistance and corrosion resistance to strong acid and alkali. The wear resistance is about 10 times that of polyurethane rubber. It is suitable for corrosive pulp; but it is brittle and easy to be neglected when installing and clamping. Crushed, can be used at higher temperature (120 ~ 140/180 ℃), but to prevent temperature changes, such as steam sterilization, the general temperature mutation should not be greater than 100 ℃, and it takes 10 minutes to heat up to 150 ℃. 2) The corrosion resistance of the electromagnetic flowmeter electrode and the grounding ring material electrode to the measurement medium is the first factor to be considered in the selection of materials, and the second consideration is whether surface effects such as passivation and the resulting noise will occur. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Electromagnetic flow meter display negative value reasons and treatment and electrode selection'

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