вихревой расходомер

working principle vortex flowmeters measure the steam,air and low viscocity flow rate on the basis of carman and strouhal theory about the apperance of flowrate and the relation between the swirl and the flowrate. plumb in a triangular prism (occurrence of the whirl)to the body.When there is a flow of fluid, the opposite direction systematic of Carmen whirl will be generated behind of the triangular prism. vortex shedding frequency F is in proportion to the rate of the flow V. detect the Nos of the vortex through sensor probe,then the rate of flow will be caculated. And then caculate the fluid volume and flowrate according to the diameter. Computing formula as follows: F=St*V/(1-1.27*d/D)formula 1 Q=3600*F/K formula 2 M=Q*pformula 3 l Fthe vortex frequancy cause when fluid flow through the triangular.(unit:Hz) l Ststrouhal constant l Vthe speed of flow in the tube(m/s) l dwidth of triangular in body of vortex l Dvortex diameter(unit:m) l Qinstantaneous volume flow rate(unit:m3/h) l Kvortex factor(unit:pulse quantity/m3) l Minstantaneous(unit:kg/h) l Pthe fluid density(kg/m3) Different diameter vortex sensor,the meter factors are different.the value is setable through set flowrate.The action is to set the pulse quantity per cubic meter. applications: 1.Ideal for high temperature and high velocity steam 2.Power Generationsteam applications 3.IndustrialHVAC, district energy management 4.Commercialbuilding, campus and facility energy management 5.Oil & gasallocation of natural gas 6.Petrochemicalmass balancing, reaction processes heatingFeasures and benefits 1. Multivariable vortex flowmeter for measuring volumetric flow, temperature, pressure, density, and mass flow using a single meter 2.Measures most gases, liquids and steam without the need to recalibrate 3.Cost effective, accurate and reliable meter for volumetric and mass flow measurement 4.Remote monitoring and integration to DCS 5.Significant cost savings through reduced installation costs, wiring runs and services support. Technique target: 1accuracy class:1.0 2norminal pressure:1.6Mpa 2.5Mpa 4.0Mpa and larger 3the fluid temperature:-40 350 4pressure loss:drag coefficient cd≤2.4 5power supply:12 24VDC 6explosion proof:IaiiCT6(Ex ia IIB T6) 7output:voltage pulse low level(IV high voltage)6V standard current signal4 20mA