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Installation requirements for electromagnetic flowmeters

2020-09-30View Original

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There are no particularly strict requirements regarding the installation orientation of electromagnetic flowmeters; generally, they can be installed horizontally, vertically, or at an angle, with no restrictions. It must be emphasized, however, that in order to better ensure that the pipeline is filled with the substance under test, that is, to achieve a \"full pipeline\" condition, it is recommended to install it vertically with the flow coming from top to bottom; this is especially important for liquids that are in a solid-liquid two-phase state. Vertical installation is essential in such cases. If only level installation is permitted on the spot, it is essential to ensure that the two electrodes are in the same plane, and that the center lines of the electrodes are as horizontal as possible. Since the electrode at the bottom is very prone to being covered by debris, while the electrode at the top can be obscured by bubbles sometimes present in the liquid, which cover the surface of the electrode and cause fluctuations in the output data signal.   1. There should be at least 5D N of pipe connection length upstream and downstream of the electromagnetic flowmeter, and at least 3D N of such connection length in the middle and downstream sections. To facilitate installation and disassembly, pipe expansion joints can be installed during the original manufacturing of the steam flowmeter ;   2. The direction of fluid flow is consistent with the direction indicated by the arrow symbols on the steam flow meter housing ;   3. If there is negative pressure in the pipeline, it will damage the internal lining material of the steam flow meter; therefore, care must be taken to avoid the occurrence of negative pressure. For example, when the temperature of the liquid is higher than the indoor temperature, and the shut-off valves located upstream, at the sensor itself, and downstream are closed to stop operation, the contraction of the liquid refrigerant creates negative pressure; therefore, a negative pressure relief valve should be installed around the sensor ;   4. Electromagnetic flowmeters should avoid using pumps, gate valves, and other mechanical devices as much as possible, to prevent them from affecting accurate measurements ;   5. Steam flow meters should be protected as much as possible from interference signals such as radio frequency emissions, magnetic fields, and strong vibrations ;   6. If vibrations in the pipeline are to be measured accurately, fixed rubber supports must be installed on both sides of the steam flow meter ;   7. When accurately measuring the mixed-phase liquid, select a location where phase separation is unlikely to occur ; When accurately measuring component liquids, prevent it from being in a mixed and uneven mid-to-lower stage ; When accurately measuring the pipeline for chemical reactions, it must be installed in the middle and lower reaches where sufficient reaction occurs ; Additionally, when accurately measuring the liquid in the mixed phase, the distance between the mixing point and the steam flow meter must include at least a 30 DN pipe section ;   8. To facilitate the cleaning and maintenance of the steam flow meter in the future, a bypass valve pipeline should be installed, and the piping sections 5D N ahead of and 3D N behind the steam flow meter must be ensured to be in order ;   9. When installing an electromagnetic flowmeter, care should be taken to tighten the two flanges evenly; otherwise, the lining material may be damaged, and it is best to use a torque wrench for this purpose ;   10. The sensor must have its own separate grounding system; under normal conditions, the resistance of the grounding wire should be below 100 ohms. For explosion-proof equipment and installations where protection against electric shock is required, the resistance of the grounding wire should be less than 10 ohms. Under normal conditions, the grounding device of a separate steam flow meter should be located on the side of the sensor, while the grounding device of the converter should be at the same grounding point ;   11. The converter of a split-type electromagnetic flowmeter is generally installed around the sensor or in the high/low voltage distribution rooms. It should be noted that in order to prevent electromagnetic interference, the communication cable must be run separately within a shielded metal conduit; the signal cable and the power cable must not be run together in the same conduit. No more! More updates to come – stay tuned!

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