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Flow measurement is widely used in industrial and agricultural production, national defense construction, scientific research foreign trade and people's lives in all fields. In the petroleum industry, the flow measurement from the oil extraction, transportation, refining and processing until the trade sales and flow measurement runs through the whole process. Flow measurement can not be carried out at any stage, otherwise the normal production and trade contacts of the oil industry can not be guaranteed . In the chemical industry, inaccurate flow measurement can result in an imbalance in chemical composition distribution, inability to guarantee product quality, and serious production safety incidents. In the power industry, the liquid, gas, steam and other media flow measurement and regulation occupy an important position. The accuracy of flow measurement not only has great economic significance to ensure power plant running under optimal parameters, but also with the development of high temperature and pressure high-capacity units, flow measurement has become an important part of ensuring the safe operation of power plants. Such as large-capacity boiler instantaneous water supply flow interruption or decrease, may cause serious dry boiler or squib accident. This requires that the flow measurement device should not only be accurately measured, but also promptly send an alarm signal. In the steel industry, the flow measurement of circulating water and oxygen (or air) during the steelmaking process is one of the important parameters to ensure product quality. In light industry, food, textile and other industries, are also inseparable from the flow measurement.
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