Application of Electromagnetic Flow Meter in Water Supply Enterprise

Abstract: The application information of electromagnetic flow meter in water supply enterprises is provided by excellent flow meter and flow meter manufacturers. Electromagnetic flowmeter is an instrument that measures volume flow according to Faraday's law of electromagnetic induction. It is only suitable for conducting liquid flow measurement. The output current has a linear relationship with the instantaneous flow, and is not affected by the physical properties of the fluid (temperature, pressure, density and viscosity). . More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the application of electromagnetic flowmeters in water supply enterprises. Electromagnetic flowmeter is an instrument that measures volume flow according to Faraday's law of electromagnetic induction. It is only suitable for conducting liquid flow measurement. The output current has a linear relationship with the instantaneous flow, and is not affected by the physical properties of the fluid (temperature, pressure, density and viscosity). , the accumulated flow is output by pulse signal. The electromagnetic flowmeter has a wide measurement range, the same electromagnetic flowmeter can reach 1:100, and its diameter can also range from 1cm to more than 2m. In recent years, electromagnetic flowmeters have been widely used in water supply enterprises due to their high measurement accuracy, good stability, and rapid response. 1 Application of electromagnetic flowmeter in water supply enterprises (1) Use as settlement water meter. The settlement water meter is an important settlement tool for the economic income of water supply enterprises. The management procedures of the flowmeter are: purchase the electromagnetic flowmeter (the cost is included in the installation cost), file the calibrated quality report in a unified way, install it (two locks for management: one for the user, one for the water company), and report the setting coefficient to the unified archive. , use, and check regularly. In terms of water consumption data monitoring: large-caliber can transmit 24-hour GPRS real-time data, and set an alarm for abnormal flow; small-caliber use mobile phone GSM to collect regularly, so as to achieve effective monitoring of data. (2) Installed in the urban pipe network for regional metering. The regional installation meter measures the water supply of the surrounding large branch pipes, and considers the water recovery rate in the area. If the difference is too large, it is necessary to detect leaks or check for violations. By regional metering, the total“Recovery rate”Decomposition, from the local to the overall level-by-level, to provide assessment basis for target management. At present, the main and branch pipes of the pipe network in the four suburban towns of Huizhou Water Supply Corporation have large diameters, some of which are DN600 and DN800. The flow rate is large, the pipes are relatively new, and there is not much leakage. Therefore, we chose the measurement accuracy and high sensitivity in the selection. , Use the electromagnetic flowmeter with good stability and wide measuring range. (3) It is used for water quantity measurement in water works. Electromagnetic flowmeters used for water metering in water plants are mainly to provide an effective basis for production and management. The most direct function of the inlet electromagnetic flowmeter installed in the water plant is to provide real-time water production, which is convenient for the automatic control of water purification and chlorine injection, and calculates the consumption of medicine, chlorine and electricity, effectively controlling the cost of water purification and treatment. Provide real-time basis; on the other hand, when the suction pump room is normally turned on, the abnormal flow can be displayed through the water inlet flowmeter, which can timely reflect the failure of the water supply pipeline burst or the abnormal unit. The factory water flow meter can participate in the scheduling of the urban pipe network together with the factory water pressure to ensure the appropriate water supply pressure; it can also provide a reference for the operation of the pump room unit. Although the electromagnetic flowmeter has less interference and relatively good measurement accuracy and stability, for more accurate measurement and long-term stability, imported ultrasonic flowmeters of the same accuracy level are generally used for regular calibration. Our company has purchased a portable time difference ultrasonic flowmeter and a portable handheld ultrasonic flow test system (with an ultrasonic thickness gauge) to regularly calibrate the measurement errors of the instruments. After three or four years of actual use, the measurement reading errors of electromagnetic flowmeters and ultrasonic flowmeters of the same accuracy level are within 3%, which is basically acceptable. 2 Problems encountered in the use of electromagnetic flowmeters 2.1 Lightning protection problems Whether it is a settlement water meter or an electromagnetic flowmeter for regional metering, in the relatively open suburbs, especially in Guangdong where thunderstorms cover a large area, the protection of electromagnetic flowmeters Ray is a more severe test. After strict grounding and power protection, the electromagnetic flowmeter installed in an open area has a high probability of being struck by lightning. At least 2 of our 4 flowmeters used for regional flow measurement are damaged by lightning strikes every year, and cannot be repaired. Only new converters can be purchased, which is costly. Other water companies usually use the electromagnetic flowmeter well to build houses, make ground grids and install lightning rods to avoid lightning, which has obvious effects. However, water companies also need to solve the problem of land use rights and coordination planning with the surrounding environment, and the procedures are more complicated. Therefore, the most simple and effective way is to improve the lightning protection performance of the flowmeter itself. If it cannot be solved fundamentally, the internal circuit should be separated and protected, so that even if the lightning strike is damaged, the replacement cost can be reduced. 2.2 Power supply problem Because the electromagnetic flowmeter needs an external power supply, it is inconvenient to install it outdoors, and it also limits the use of the electromagnetic flowmeter in the suburban pipe network.
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