01??? To select the measurement catheter transmitter at any time position of the liquid filled is installed to prevent the liquid in the conduit since the measurement is not generated illusion caused by the pointer is not null. It is mounted vertically, reducing errors caused by liquid flowing through the electrodes. If placed horizontally, the two electrodes of the flowmeter must be kept on the same level, in order to prevent the sediment or air in the top of the tube from insulating it. 02??? If necessary, you can let vent pipe, built-empty pipe detection circuit, the signal will stop output and accumulated traffic. ??? 03 fluid in the pipe's protection anode flow, electromagnetic flow meter installation, to follow the following points: In order to allow fluid to be well grounded, to use the ring; when a sensor linked up with the pipeline, to be between the flange There is an insulating pad and an insulating sleeve is also used on the screw. 04??? When the electromagnetic flowmeter is mounted on a grounded metal pipes, through the ground terminal of the electromagnetic flowmeter transmitter system for implementing potential equilibrium, i.e., cross-sectional area of not less than 6mm 2 copper wire connected to the ground terminal When the electromagnetic 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 mm 2 and grounded; the transmitter or sensor junction box is connected to Ground potential is balanced on the ground terminal. When the electromagnetic flowmeter is installed on a plastic pipe or a pipe with an insulating lining, the system potential balance is achieved through an additional grounding ring. The grounding ring is connected to a copper core wire with a cross-sectional area of ​​at least 6 mm 2 Ground terminal. 05 ? ? ? electromagnetic flow transmitter should be installed in indoor dry and ventilated place, avoid installation in places with high ambient temperature, should not be subject to strong vibration, try to avoid equipment with strong magnetic field, such as large motors, transformers, etc. Installed in the presence of corrosive gases, the installation site is convenient for maintenance. This is the environmental condition that ensures the normal operation of the transmitter. 06??? Measured media in order to ensure full measuring tube of the electromagnetic flow transmitter, mounted vertically stacked variant, flows from bottom to top, in particular for phase fluids, must be installed vertically. If the site only allows horizontal installation, you must ensure that both electrodes are in the same horizontal plane. 07??? Electromagnetic Flow Transmitter should be installed at both ends of the valve and bypass. 08??? Electromagnetic Flow Transmitter electrodes measured a few millivolts ac potential, the potential of the liquid inside the transmitter is based. In order to stabilize the liquid potential and maintain the potential between the transmitter and the fluid in order to ensure stable measurement, both the transmitter housing and the metal tube should have good grounding. The converter housing should also be grounded, and the grounding resistance should not be greater than 10 Ohm, cannot be shared with the ground wire of other electrical equipment. If it is not guaranteed that the transmitter housing is in good contact with the metal pipe, use metal wires to connect them and ground them reliably. 09??? To avoid signal interference between the signal converter and the transmitter must be shielded wire transmission, does not allow the signal and power cables together in the same parallel steel cables, signal cable length is generally not exceed 30m. 10??? Installation site should be avoided converter AC, DC magnetic field and vibration, ambient temperature is -20 ~ 50 ℃, and not containing corrosive gas, relative humidity less than 80%. 11??? In order to ensure the normal operation of the electromagnetic flowmeter to reduce measurement errors, the front and rear electromagnetic flowmeter shall meet certain straight pipe requirements. According to the JJG 1033-2007 "Magnetic Flowmeter Verification Protocol" test standards, usually the straight pipe section should reach 10D, and the straight pipe section should be 5D. 12??? Installation location. Electromagnetic flowmeters can be installed vertically and horizontally, but it is recommended that they be mounted vertically and the fluid under test flow from bottom to top. Can also be installed horizontally, but to make the two electrodes on the same level. When installing horizontally, ensure that the measuring catheter is filled with liquid. When the main line is a vertical pipeline, it is generally required that the flow be from bottom to top, and try not to top-down. The latter tends to cause greater fluctuations in traffic. It is also important to install the pipe in addition to the full pipe, followed by the straight pipe distance. Choose a convenient place for maintenance and activities. The flowmeter should be installed at the rear of the pump and must not be installed on the suction side: The valve should be installed on the downstream side of the flow. 13??? As the electromagnetic flowmeter is weak potential, the need to eliminate all outside interference can be accurately measured, and thus a good grounding protection is a necessary condition for stable operation of the electromagnetic flowmeter. Grounding is usually achieved by grounding the ring or reference electrode in the sensor and grounding the piping system. 14??? Flowmeter installation location away from all the magnetic source (such as high-power motors, transformers, etc.). 15??? As with other flowmeters, electromagnetic flowmeters have protection class, usually one type of protection class IP65, the split is IP68 (for sensor purposes), if requested by the customer on the instrument installation environment, installation site Underground wells or other wet places, it is recommended that customers choose split type. In order to avoid wrong choices on the instrument damage. 16??? Electromagnetic flowmeter can measure the corrosive liquid, but the initial customer orders to other measuring media properties correctly to avoid errors during the selection of the selection on the electrode, causing the sensor scrapped in the late stage of the process, to bring customers Inconvenience and economic loss. 17??? Although the reliability of the electromagnetic flowmeter is better, under normal circumstances will not be damaged, but because of its principle of decision, the sensor electrodes and liquid contact surface has, over time, the electrode surface more vulnerable to contamination. Therefore, in the general case of electromagnetic flowmeters, under the condition that the customer is disassembled, it is recommended to remove and clean the primary electrode from year to year and a half to ensure the measurement accuracy of the flowmeter. Any instrumentation requires "maintenance," and electromagnetic flowmeters are no exception. 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