Small gas flowmeters play an important role in the field of environmental protection

Small gas flowmeter plays an important role in the field of environmental protection Small gas flowmeter is a very important industrial flow meter. In order to better use the small gas flow meter to serve us, we must reach the point of proficiency and understanding. Small gas flowmeters also play an important role in the field of environmental protection. In order to control air pollution, people must monitor the emissions of flue gas and other greenhouse gases that pollute the atmosphere; the discharge of waste liquid and sewage pollutes surface water sources and groundwater sources, and people must treat waste liquid and sewage and discharge Quantity is controlled. As a result, millions of flue gas discharge points and sewage discharge outlets have become flow measurement objects. Although this type of instrument has multiple automatic processing functions and low power consumption, it still needs to strengthen the management after it is put into operation. For example, to ensure long-term workflow accuracy, reliability (avoid accidental shutdown and data loss), small gas flowmeters should be regularly calibrated (every 1 to 2 years), transcribed head data (daily or weekly), replaced media Parameters (monthly or quarterly) and irregularly check battery status, check meter factor and seal, etc. The small gas flowmeter can be installed on horizontal, vertical or inclined pipelines. But when measuring liquids, small gas flowmeters installed on vertical or inclined pipes must ensure that the liquid flows from bottom to top, so as to ensure that the pipes are filled with liquid and offset the impact of additional gravity. There should be a long straight pipe section upstream and downstream of the small gas flowmeter, and the size of the straight pipe section varies according to the upstream pipe type. The inner diameter of the pipe where the small gas flowmeter is installed must be consistent with the inner diameter of the flowmeter. Otherwise, the diameter of the upstream and downstream pipelines at the section where the small gas flowmeter is installed should be reduced. The principle of selecting the pipe diameter is: the inner diameter of the pipe must be consistent with the nominal inner diameter of the flowmeter. The relative error of the two inner diameters is controlled at±Within 1% is better. The correct use of small gas flowmeter selection. Therefore, in the selection process, two basic principles should be grasped; namely: to ensure the use of precision and to ensure safe production. To do this, we must select three parameters, namely the direct and long-term maximum, minimum and commonly used instantaneous flow (mainly for selecting the size of the instrument specification), the design pressure of the measuring medium (mainly for selecting specified nominal pressure level gauge), working pressure (mainly used to select the gauge pressure sensor pressure level). A small gas flowmeter is an instrument that places a bluff vortex generator in the fluid, and the fluid separates alternately on both sides of the generator to release two strings of regularly staggered vortices. Small gas flowmeter is the youngest type of flowmeter, but it has developed rapidly and has become a general type of flowmeter. Although there are not too many special requirements for the installation process and use environment of this kind of flowmeter, but any type of flow measurement instrument is so common, avoid vibration and high temperature environment flow interference elements (such as compressors, separators, pressure regulating valves, etc.) as much as possible. Reducer, pipe, elbow, etc.), keep the instrument in the front and rear straight pipes continuously smooth, ensure clean measurement medium single-phase fluid, etc. In the field of scientific experiments, a wide variety of small gas flowmeters provide a large amount of experimental data. The flowmeters used in this field are more specific, among which high temperature, high pressure, high viscosity, variable composition, pulsating flow and micro flow of fluid are often measured objects.

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