Break the routine, meet more customer requirements, customized for clients of various kinds of non-standard type flowmeter, it is a kind of ability, is also a kind of attitude.Let the customer buy satisfied products, let customers get the perfect service that is our attitude.

Working Principle

Non-streamline vortex-maker be set in fluid(anti-flow part),then two regular vortex would be come out,from two sides of the vortex-maker in turn,so this kind of vortex be called as Karman vortex street,Fig.1 as follow.

Vortex is not flowing symmetrically under vortex-maker set.As if,set frequency of vortex is f,the speed of test medium is V,inlet face width of vortex-maker is d,Past part diameter is D,as the principle of Karman vortex street,as follow:

f=St×v/d

In the formula:

St-Jack straw Hal number;

f-frequency product by single side vortex;

v-flowrate;

d-diameter.

So,check the separate frequency of Karman vortex street to know the instant capacity(flow).among,Strouhal number(St)is dimensionless number, Fig.2 Show the relation of,Strouhal number(St)&Reynolds number(Re).

                                                                                                              Fig.2

 Straightness part in curve(St=0.17),free frequency & flow rate of vortex is direct ratio,it means flow sensor range.So just check out frequency (f),we can get the flow rate inside pipe,then as the flow rate(V)to take volume flow,the ratio record of impulse& volume,called as(K),as following:

                      K=N/Q(1/m³)            

Model:K=instrument constant(1/m³).

          N=impulse number

        Q=volume flow(m³)

Technical Parameter

Outline Size

Full Package Type Installing Size

Plug-in Type Installing Size

Type Selection

  1.Model selection table of vortex street flow meter(JB/T9294-1999 standard)

   2. Table of comparisons sensor drift diameter

CHENGFENG FLOWMETER as a traffic instrument, temperature instruments, pressure instruments, level instrument professional manufacturers, has always insisted on developing new technology, research and development of new products, develop technical advantage, tally up experience of 30 years production practice, efforts to develop all kinds of flow metering products, forming scale, systematic and diversified pattern of production.Adhere to the "quality first, customer first" the light of policy, implementation of GB/T19001-2000 quality management system requirements, to ensure product quality long-term stability and constantly improve, to provide users with high-quality products and perfect service.