Flowmeter, a meter that indicates the flow rate being measured and/or the total amount of fluid over a selected time interval. Simply put, it is an instrument used to measure the flow of fluid in a pipe or open channel.
Flowmeters are further divided into differential pressure flowmeters, rotor flowmeters, throttle flowmeters, slit flowmeters, volumetric flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc. Classification by medium: liquid flowmeter and gas flowmeter.
Flow measurement is widely used in industrial and agricultural production, national defense construction, scientific research, foreign trade, and various fields of people's life. In the production of petroleum industry, from oil extraction, transportation, smelting and processing to trade sales, flow measurement runs through the whole process. No link is inseparable from flow measurement, otherwise the normal production and trade exchanges in the petroleum industry will not be guaranteed. . In the chemical industry, inaccurate flow measurement will cause imbalance in the distribution ratio of chemical components, unable to guarantee product quality, and serious production safety accidents will occur. In the production of electric power industry, the measurement and adjustment of the flow of liquid, gas, steam and other media play an important role. The accuracy of flow measurement is not only of great economic significance to ensure that power plants operate under optimal parameters, but also with the development of high-temperature, high-pressure and large-capacity units, flow measurement has become an important link to ensure the safe operation of power plants. If the instantaneous water flow of large-capacity boilers is interrupted or reduced, it may cause serious dry boiler or pipe burst accidents. This requires that the flow measurement device should not only measure accurately, but also issue an alarm signal in time. In the production of iron and steel industry, the flow measurement of circulating water and oxygen (or air) in the steelmaking process is one of the important parameters to ensure product quality. In light industry, food, textile and other industries, flow measurement is also inseparable.
The most widely used transducers are clip-on and plug-in. The monophonic ultrasonic flowmeter is simple in structure and easy to use, but this kind of flowmeter has poor adaptability to changes in flow distribution. The rapid development of microelectronic technology and computer technology has greatly promoted the replacement of instruments, and new flowmeters have sprung up. So far, it is said that hundreds of flowmeters have been put into the market, and many difficult problems in field use are expected to be solved. The work of modern flow measurement technology in my country is relatively late. It is set at the upstream end of the measurement flow channel 6 and relative to the holes 11 and 12 to reduce the flow of the fluid to be measured into the holes 11 and 12; the measurement control part 19 is used for measuring the propagation time of the ultrasonic waves between the ultrasonic transducers 8 and 9;
The flowmeter should try to avoid ferromagnetic objects and equipment with strong electromagnetic fields (such as large motors, large transformers, etc.), so as to prevent the magnetic field from affecting the working magnetic field and flow signal of the sensor. Flow signal wire and excitation wire between sensor and scoop converter. However, from the analysis of the damaged components in the lightning fault, most of the induced high voltage and inrush current caused by the fault are introduced from the power supply line of the control room, and the other two ways are less. Since the electromagnetic flowmeter has more opportunities to measure suspended solids or dirt than other flowmeters, the probability of failure caused by the adhesion layer on the inner wall is relatively high. If the conductivity of the adhesion layer is similar to that of the liquid. Common commissioning-period failures are usually caused by improper installation.
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