Brief Introduction of Henan SIA instrument XFV series vortex flowmeter 
 The vortex flowmeter is the use of a Karman vortex street principle of flow measurement. Vertically into a cylindrical object in the measuring tube, the fluid on both sides of the columnar objects naturally alternately produce regular swirl (shown below), this whirlpool column known as a Karman vortex street. The release of the vortex is most stable when d / D = 0.281. (D is the diameter of the pipe.) The release of Karman vortex street frequency and fluid flow can be expressed as: 
 The F = st? V / d where: 
 Release frequency of the F -------- Karman vortex street 
 St -------- coefficient 
 V --------- flow 
 d --------- width of the columnar objects 
 Strouhal coefficient is an important factor of the vortex flowmeter, within a certain range of Reynolds numbers, the Strouhal number is nearly constant. As shown below, in the flat part of curves St = 0.17, whirlpool release frequency is proportional to flow rate, detection frequency f can be obtained flow velocity v The volume flow obtained by the v. 
 For measuring flow the vortex separation frequency and flow velocity changes from the impact of fluid density and viscosity. Partial pressure pulsation, accompanied by the swirl separation piezoelectric probe detected, and is converted into a whirlpool of frequency corresponding to the pulse signal detection circuit. Pulse signal can also be converted to the F / V and V / I 4-20mA standard current signal output. 
 Company Name: Henan Airlines Traffic Instrument Co., Ltd. 
 Address: Grace Avenue, Xinxiang City, Henan Province, the western part of high-Bay northbound 
 Tel: 0373-2678088 0373-2677766 
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 Contact: Yang Yang 
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 Post Code: 453 003 
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 Website: http://www.hnxhyb.com.cn 
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