CHENGFENG FLOWMETER for 30 years, has been in the study and progress, learning advanced foreign instrumentation equipment and technology, the introduction of advanced technology, and then based on the research and development of new technology, combined with the requirements of customers innovative products that meet customer needs, meet the requirements of customers, the pursuit of perfect quality, technical breakthroughs.
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
Attention of preventive maintenance of vortex flowmeter:
1. The sensors have no moving parts, need not often maintenance.When the measured medium is not pure or have sediment, according to the actual situation, regular cleaning the sensor.
2. Maintenance sensor, especially protect the vortex occurred body and probe body.Did not make clear the probe body fault may, at the time of free disassembly, so as not to damage the probe or destroy sealing body, make the sensor produces leakage phenomenon.
3. The failure, we should first check the power supply is correct, whether fluid condition changes, such as fault cannot be solved, please contact the factory.
4. The sensor calibration cycle for two years.
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.
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