Selection of flow meter in sewage flow monitoring

Abstract: The selection information of flow meter in sewage flow monitoring is provided by excellent flow meter and flow meter manufacturers. Abstract: Due to the characteristics of large flow changes, impurities, electrical conductivity and corrosiveness in sewage, the selection of flowmeters is complicated. From the measured object, flowmeter performance, installation conditions, use environment, economic cost, etc., the electromagnetic. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the selection of flowmeters in sewage flow monitoring. Abstract: Due to the characteristics of large flow changes, impurities, electrical conductivity and corrosiveness in sewage, the selection of flowmeters is complicated. The electromagnetic flowmeter, ultrasonic flowmeter and V-cone flowmeter are compared and analyzed from the aspects of the measured object, flowmeter performance, installation conditions, use environment, economic cost, etc., to provide reasonable selection of flowmeters in the process of sewage flow monitoring refer to. Keywords: Sewage flow monitoring Electromagnetic flowmeter Ultrasonic flowmeter V-cone flowmeter Flowmeter is one of the few instruments and meters that are more difficult to use than to manufacture, mainly because there are many types of flowmeters, each with its own characteristics, plus the different characteristics of the measured object. Sewage, especially untreated sewage, is not only highly corrosive, but also contains a large amount of impurities and has certain electrical conductivity. At the same time, the selection involves many technical problems and economic factors. Therefore, in order to be technically feasible and economically reasonable, it is necessary to understand the performance characteristics and working principles of each flowmeter, so as to ensure a more reasonable selection of flowmeters. Through the introduction of several commonly used flowmeters, this paper explains how to reasonably select different flowmeters in the process of sewage flow monitoring according to the actual application. 1 Several commonly used flowmeters in flow monitoring 1.1 Electromagnetic flowmeter Electromagnetic flowmeter is an instrument that measures the volume flow of conductive liquids based on Faraday's law of electromagnetic induction. Due to its unique advantages, it is currently widely used in acid, alkali, salt and other corrosive media, flammable and explosive media, sewage treatment and measurement of slurry flow in chemical, pharmaceutical, food and other industries, and has formed a unique field of application. 1.2 Ultrasonic flowmeter Ultrasonic flowmeter is an instrument that measures flow by detecting the action of fluid flow on ultrasonic beam (or ultrasonic pulse). There are many measurement methods for ultrasonic flowmeters, including time difference method, frequency difference method, phase difference method, and Doppler method. Time difference method and Doppler method are the most widely used measurement principles. Like electromagnetic flowmeters, ultrasonic flowmeters are unobstructed flowmeters because there is no obstruction in the flow channel of the instrument, which is suitable for solving difficult problems in flow measurement, especially in large-diameter flow measurement. It is one of the rapidly growing types of flow meters. Ultrasonic flowmeter is characterized by non-contact measurement, no flow obstruction measurement, no pressure loss, non-conductive liquid can be measured, and it is a supplement to electromagnetic flowmeter without obstruction measurement. The transit-time ultrasonic flowmeter is currently the most widely used. With the development of CPU and signal processing technology, the measurement accuracy and reliability have been greatly improved. In particular, with the development of time measurement technology, the time difference resolution has been improved, and the problem of difficult measurement of small diameters and low flow rates has been solved. The application field also extends from purified water to circulating water, sewage, heavy oil, crude oil, refined oil, air, natural gas and other media. However, liquids with more bubbles or suspended solids will hinder the normal propagation of sound pulses, resulting in normal measurement, so ultrasonic flowmeters are more suitable for measuring pure liquids. Doppler ultrasonic flowmeters generally require that there are large enough scatterers in the fluid, and they must be continuous. Usually, the velocity of the scatterer and the velocity of the fluid have a significant slippage, which requires that the velocity of the fluid flow must be much larger than the critical velocity of particle precipitation. In addition, the measured velocity is only the velocity value of the point where the scatterers meet. Therefore, The measured velocity value has a great dependence on the flow velocity distribution and flow state, that is to say, the length of the straight pipe section is required to be very long, and it needs to be more than 20 times the pipe diameter.

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