The natural gas flowmeter is manufactured using the Karman vortex principle. It has the advantages of high measurement accuracy, wide range, low power consumption, convenient installation, simple operation, and small pressure loss. It can measure volume flow under working conditions or standard volume flow (integrated intelligent temperature, Pressure compensation), according to user needs, can be accompanied by pulse or 4-20mADC current output function. It is an ideal natural gas meter at present.
In the fluid pipeline, a cylindrical barrier is inserted vertically, and vortices are alternately generated on both sides of the rear part (relative to the fluid flow direction). As the fluid flows downstream, a series of vortices is formed, which we call the Karman vortex street. We define the cylindrical barrier that generates the vortex as the vortex generator. Experiments have proved that the separation frequency of the vortex is linearly related to the flow velocity of the fluid under certain conditions. Therefore, as long as the frequency of vortex separation is detected, the flow velocity or flow rate of the pipe body can be calculated.
The success of the selection depends to a large extent on the selection personnel's exact understanding of the performance and quality of the instrument and the characteristics of the measurement object. Special attention should be paid to the false propaganda and misleading components of the manufacturer regarding the performance and quality of the instrument. The exact understanding of the measurement object is very important. It is not that the user has an accurate understanding of the measurement object. Many selection failures are caused by inaccurate parameters. Some object characteristics require in-depth investigation to clarify.