17 key issues to be aware of in the application of electromagnetic flowmeter engineering 1. The transmitter should be installed at any time to measure the position of the catheter filled with liquid to prevent the illusion that the pointer is not at zero due to the absence of liquid in the measuring catheter. It is mounted vertically to reduce errors caused by liquid flowing through the bubbles on the electrodes. If placed horizontally, the two electrodes of the flowmeter must be kept at the same level to prevent it from being insulated by deposits or air at the top of the tube. 4. When the electromagnetic flowmeter is installed on the grounded metal pipe, the system potential balance is realized by 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; The flowmeter is installed on an ungrounded metal pipe. Both flanges are connected to the pipe flange through a copper core wire with a cross-sectional area of ​​at least 6 mm2 , and grounded; connect the transmitter or sensor junction box to the ground terminal. The system potential balance is realized; 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, and the grounding ring is connected to the grounding terminal through a copper core wire having a cross-sectional area of ​​at least 6 mm2 . 5 , electromagnetic flow transmitter should be installed in the indoor dry ventilation, to avoid installation in places where the ambient temperature is too high, should not be subject to strong vibration, try to avoid equipment with strong magnetic field, such as large motors, transformers, etc., to avoid installation In the case of corrosive gases, the installation location is easy to access, which is the environmental condition to ensure the normal operation of the transmitter. 7. The electromagnetic flow transmitter should be equipped with valves and bypass at both ends. 8. The millivolt AC potential measured by the electrodes of the electromagnetic flow transmitter is based on the liquid potential in the transmitter. In order to stabilize the liquid potential and maintain the potential of the transmitter and fluid to ensure stable measurement, the transmitter shell and the metal tube should have good grounding at both ends, and the converter housing should also be grounded. The grounding resistance should not exceed 10 Ohmic, cannot be shared with the ground wire of other electrical equipment. If the transmitter housing is not guaranteed to be in good contact with the metal tubing, connect them with metal wires and ground them reliably. 9. In order to avoid interference signals, the signal between the transmitter and the converter must be transmitted by shielded wires. It is not allowed to place the signal cable and the power cable in parallel in the same cable . The length of the signal cable should not exceed 30m . 10 , the converter installation site should avoid AC and DC strong magnetic field and vibration, the ambient temperature is -20 ~ 50 °C , and can not contain corrosive gas, 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 electromagnetic flowmeter should meet the requirements of a certain straight pipe section before and after. According to JJG 1033-2007 "Electromagnetic Flowmeter Verification Regulations" test standard requirements, usually the front straight pipe section should reach 10D , and the rear straight pipe section should be 5D . 13. Since the electromagnetic flowmeter measures the weak potential, it is necessary to eliminate all external disturbances to accurately measure, so good grounding is a necessary condition to ensure the stable operation of the electromagnetic flowmeter. Usually grounding is achieved by a grounding ring or a reference electrode in the sensor and a ground connection to the piping system. 14. Install the flowmeter away from all magnetic sources ( such as high-power motors, transformers, etc. ) . 15. Like other flowmeters, electromagnetic flowmeters also have a degree of protection. Usually, the integrated protection grade is IP65 , and the split type is IP68 ( for sensors ) . If the customer has requirements for the installation environment of the instrument, the installation location is underground. Wells or other wet places, customers are advised to use split type. In order to avoid damage to the instrument caused by wrong selection. 16. The electromagnetic flowmeter can measure corrosive liquids, but the customer should correctly provide other measuring media properties at the beginning of ordering, so as to avoid errors in the selection of the electrodes during the selection, which leads to the scrapping of the sensors in the later use process, which brings inconvenience to the customers. Economic loss. Feature: Polyurethane Foam Sealing Machine Polyurethane Foam Machine,Foam Insulation Equipment,Pu Foam Machine,Polyurethane Foam Sealing Machine JINAN EURO-ASIA INT'L CO., LTD , https://www.eaelectricmachine.com
2 , if necessary, you can let the tube vent, the built-in empty tube detection line will stop the accumulation and flow signal output.
3 , in the flow of fluid in the anode protection pipeline, when installing the electromagnetic flowmeter, the following points must be followed: in order to allow the fluid to be well grounded, the ground ring should be used; when the sensor is connected with the pipeline, there should be insulation between the flanges Insulation sleeves are also used on the pads and screws.
6. In order to ensure that the measuring tube of the electromagnetic flow transmitter is filled with the measured medium, the transformer is installed vertically, and the flow direction is from bottom to top, especially for the liquid-solid two-phase flow, which must be installed vertically. If the site is only allowed to be installed horizontally, it must be ensured that the two electrodes are at the same level.
12 , installation location. The electromagnetic flowmeter can be mounted vertically and horizontally, but vertical installation is recommended and the fluid being measured flows from bottom to top. It can also be installed horizontally, but with the two electrodes on the same level. When installing horizontally, make sure that the measuring catheter is filled with liquid. When the main line is a vertical line, in general, the water flow is required to be bottom-up, and try not to go from top to bottom. The latter is prone to cause large fluctuations in traffic. It is also important to install the full pipe, followed by the distance between the straight pipe. Choose a place that is easy to maintain and convenient for activities. The flowmeter should be installed at the rear of the pump and must never be installed on the suction side: the valve should be installed on the downstream side of the flow. 
17. Although the electromagnetic flowmeter has better reliability, it will not be damaged under normal circumstances. However, due to its principle, the surface of the sensor electrode is always in contact with the liquid. For a long time, the surface of the electrode is more susceptible to contamination. Therefore, under the general circumstances of the electromagnetic flowmeter, if the customer has the condition to dismantle, it is recommended to remove the electrode once a year to one and a half years to ensure the measurement accuracy of the flowmeter. Any instrumentation needs to be “ maintained †, and electromagnetic flowmeters are no exception.
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17 key issues to be aware of in the application of electromagnetic flowmeter engineering