With the development of China's urban economy , both the volume of domestic sewage and the volume of industrial sewage have shown a rapid growth, which has led to an ever-increasing trend of water environmental pollution and declining water environment quality. Therefore, the state has stepped up investment in sewage treatment, constructed and put into operation a large number of sewage treatment plants, and thus improved our ecological environment. How to ensure that the water quality and quantity of sewage treatment meet the national emission standards, which puts forward new requirements for the configuration and management of measuring instruments. At present, the sewage treatment plant gradually popularizes and popularizes the electromagnetic flowmeter, which measures more accurately. In the traditional monitoring and information integration system of the sewage treatment plant, the electromagnetic flowmeter uses 4-20mA (transmitting analog information) or 24VDC (transmitting switch information) signals for communication and transmission, and many in-situ flow meters and controllers The connection is one-to-one (a point of control for an I/O point to the device) so-called I/O wiring. However, there are some obvious shortcomings in such a system, that is, the information integration capability is not strong; the system is not open, the integration is poor, and the professionalism is not strong; the reliability is not easy to guarantee; the maintainability is not high. If the field-level device is equipped with a serial data interface (such as RS-232/485), the controller can complete the monitoring of the field device through the serial communication method instead of the I/O method according to the protocol specified by the interface.
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Electromagnetic flowmeters are meters that measure the flow of conductive liquids based on Faraday's law of electromagnetic induction. The application fields have been widely used in industrial and agricultural production and scientific experiments and other departments, but its successful application is still limited to axisymmetric tube flow. Non-axisymmetric flows are ubiquitous in industrial fields. In the case of non-axisymmetric flow, there are still many theoretical and practical issues to be solved. Using the uniform magnetic field, based on Maxwell-Minkowski equations, the expression of the average flow velocity under any flow pattern was obtained by integrating the induced potential on the measurement tube wall, which can be used to measure the average flow velocity of non-axisymmetric tube flow.
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Industrial boilers and industrial kilns, energy security issues to ease oil shortages, is a new type of low-pollution industrial raw materials. In the production of coal-water slurry and pipeline transportation, it must be measured and tested. Due to the special physical composition of coal-water slurry, its dynamic viscosity is between 500-3000 MPa S (compared with 800-1500 MPa S for industrial application), it is a non-Newtonian fluid, and there is the problem of precipitation and abrasion of solid particles. It is very difficult to measure the flow of coal-water slurry. According to the experience of water and coal slurry measurement at home and abroad, electromagnetic flow meter is the first choice for water coal slurry metering. This is because the electromagnetic flowmeter does not have a fluid-blocking component in the measurement tube, which is suitable for measuring such a high-concentration solid-liquid mixture, and it is less affected by the density and viscosity, so it has become the preferred measuring instrument.
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