Electromagnetic flowmeter installation precautions (17)

Abstract: Electromagnetic flowmeter installation precautions (17) information is provided to you by excellent flowmeter and flowmeter production and quotation manufacturers. Electromagnetic flowmeter 17 key considerations in engineering applications 1. The transmitter should be installed in a position where the measuring pipe can be filled with liquid at any time to prevent the illusion that the pointer is not at zero because there is no liquid in the measuring pipe. It is mounted vertically, reducing liquid flow over the electrodes. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following are the details of the article on the installation precautions of electromagnetic flowmeters (17). The correct electromagnetic flowmeter installation specification will directly affect the normal use, measurement competition and service life of the instrument. Today, we have sorted out 17 installation and application rules for you, and sorted out the installations that may lead to poor use of the electromagnetic flowmeter. Pay attention to the main points to help readers have more understanding of the standardized installation of electromagnetic flowmeters, avoid stepping on pits, and ensure the standardized installation and use and maintenance of flowmeters. The 17 key considerations in the engineering installation and application of electromagnetic flowmeters are as follows: 1. The transmitter should be installed in a position where the measuring conduit can be filled with liquid at any time to prevent the illusion that the pointer is not at zero because there is no liquid in the measuring conduit. It is mounted vertically, reducing errors caused by air bubbles created by liquid flowing over the electrodes. If placed horizontally, the two electrodes of the flowmeter must be kept at the same level to prevent deposits or air at the top of the pipe from insulating it. 2. If necessary, the pipeline can be drained, and the built-in empty pipe detection circuit will stop the accumulation and flow of the signal output. 3. For the fluid flowing in the pipeline with anode protection, the following points should be paid attention to when installing the electromagnetic flowmeter: in order to ground the fluid well, a grounding ring should be used; when the sensor is connected to the pipeline, the insulating sleeve on the flange and the screw should be used. There should be insulating pads in between. 4. When the electromagnetic flowmeter is installed on a grounded metal pipe, the system potential balance is achieved through 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; when the electromagnetic flowmeter is connected to the grounding terminal When installed on an ungrounded metal pipe, the two flanges are connected to the pipe flange and grounded through a copper core wire with a cross-sectional area of ​​at least 6mm2; the transmitter or sensor junction box is connected to the ground terminal to achieve system potential Balance; when the electromagnetic flowmeter is installed on a plastic pipe or a pipe with an insulating lining, the potential balance of the system is achieved by adding a grounding ring, which is connected to the grounding terminal through a copper core wire with a cross-sectional area of ​​at least 6mm2. 5. The electromagnetic flow transmitter should be installed in a dry and ventilated place indoors, avoid being installed in a place where the ambient temperature is too high, and should not be subjected to strong vibration. Try to avoid using strong magnetic field equipment, such as large motors and transformers, and avoid installing in places with corrosive gases. The installation location is easy to maintain and is the environmental condition to ensure the normal operation of the transmitter. 6. Valves and bypasses should be installed at both ends of the electromagnetic flow transmitter. 7. In order to ensure that the measuring tube of the electromagnetic flow transmitter is filled with the measured medium, the varactor diode should be installed vertically and flow from bottom to top, especially the liquid-solid two-phase flow. If only horizontal installation is allowed on site, both electrodes must be on the same level. 8. The few millivolts AC potential measured by the electromagnetic flow transmitter electrodes is based on the liquid potential in the transmitter. In order to stabilize the liquid potential, keep the transmitter and the liquid at the same potential, and ensure stable measurement, both ends of the transmitter casing and the metal pipe should be well grounded, the converter casing should also be grounded, the grounding resistance should not be greater than 10 ohms, and cannot be The ground wire of other electrical equipment is shared. If it is not possible to ensure good contact between the transmitter housing and the metal pipe, a metal wire connection should be used and then grounded reliably. 9. The installation location of the converter should avoid strong AC and DC magnetic fields and vibration. The ambient temperature is -20 ~ 50 ℃, without corrosive gas, and the relative humidity is not more than 80%. 10. In order to avoid signal interference, the signal between the transmitter and the converter must be transmitted through a shielded wire. Signal cables and power cables are not allowed to be placed in parallel in the same cable steel pipe, and the length of signal cables generally does not exceed 30m. 11. In order to ensure the normal operation of the electromagnetic flowmeter and reduce the measurement error, the electromagnetic flowmeter should meet certain requirements of the front and rear straight pipe sections. According to the test standard requirements of JG1033-2007 'Electromagnetic Flowmeter Verification Regulations', the front straight pipe section should reach 10D, and the rear straight pipe section should reach 5D. 12. Installation location. The electromagnetic flowmeter can be installed vertically or horizontally, but vertical installation is recommended, and the measured fluid flows from bottom to top. It can also be installed horizontally, but the two electrodes should be on the same level. When installed horizontally, make sure that the measuring tube is filled with liquid at all times. When the main pipeline is a vertical pipeline, the water flow is generally required to flow from bottom to top, and try not to flow from top to bottom. The latter tends to cause large flow fluctuations. In addition to the full pipe installation, this is also important, followed by the distance between the front and rear straight pipes.
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