的发展趋势 Development trend of electromagnetic flowmeter
1) The development of non-full character fcl magnetic flowmeters; 2) built-in temperature detection elements in the electromagnetic flow meter to repair volume temperature effects; 3) electromagnetic flowmeters from the process industry to the civilian field.
的应用 Application of electromagnetic flowmeter
1) 1F full-tube electromagnetic flowmeter is applied to the field of F water discharge with free surface natural flow, to improve the measurement accuracy of this field, and to reduce the error of traditional non-full-pipe flow or open channel flow from ± 3% to 5% FS, Reduced to ± 1% Fs ～ 2% FS
2) Measuring liquids with lower conductivity: It can measure liquids with a conductivity value 2 to 3 orders of magnitude lower than that of conventional electromagnetic flow meters. Glycerin, ethylene glycol, etc., which could not be measured before, can now be measured. 3) Low power consumption and two-wire electromagnetic flowmeters are developing rapidly: Low power consumption electromagnetic flowmeters make it possible to use ten batteries or solar cells, and it is more convenient to use electromagnetic flowmeters in places without mains power supply. 4) Two-dimensional electromagnetic flowmeter and multi-insertion electromagnetic flowmeter: The two-dimensional electromagnetic flowmeter allows the electromagnetic flowmeter family to enter the field of hydrological test applications. In addition, the plug-in electromagnetic flowmeter also refers to the design ideas of the uniform velocity tube. Seven sets of flow velocity measurement units are installed in the insertion rod to improve the measurement accuracy, and the plug-in electromagnetic flow rate iI is in a favorable position for large-diameter applications.
的工作原理、结构、特点及设计选型可知，智能电磁流量计的安装应注意以下10点： From the working principle, structure, characteristics and design and selection of intelligent electromagnetic flowmeters, we should pay attention to the following 10 points in the installation of intelligent electromagnetic flowmeters:
1. Select the installation location and position of the intelligent electromagnetic flowmeter as required, but the axis of the electrode must be approximately horizontal; 2. Note that the flow direction on the flowmeter is consistent with the actual flow direction of the fluid; 3. The measurement tube must be completely complete at all times Filled with medium, accurate measurement can only be obtained when the pipe is full. For partially filled pipes, an installation method similar to the reactor valve should not be used. Do not install at the lowest point to prevent solids from accumulating. In addition, to prevent the generation of vacuum, you should Avoid installing the sensor at the inlet end of the pump; 4. When installing, make sure that there is enough space near the pipe flange; 5. The pipes on both sides of the flowmeter should be supported firmly and not installed in places with strong vibration; 6 For the convenience of installation, for large-sized instruments with DN> 200, telescopic tubes can be used to allow the axial displacement of the docking flange; 7.Measured from the electrode axis, the length of the shortest straight pipe section upstream is 5DN and the length of the shortest straight pipe section downstream 2DN (DN is the inner diameter of the pipe); 8. For split-type intelligent electromagnetic flowmeters, the signal converter (and power amplifier) should be installed as close as possible to the sensor The connecting wire should be shielded cable, preferably a double-layer shielded cable, and the signal converter (or power amplifier) should not be directly exposed to sunlight. If necessary, a sunshade can be installed; 9. For fluid For vortex or spiral flow, lengthen the upper and lower straight pipe sections and install flow straighteners; 10. In order to make the instrument work reliably and improve the measurement accuracy and not be affected by the external parasitic potential, the sensor should have a good separate ground wire , The ground resistance is <10Ω.