Lugb Vortex Flow Meter

Summary

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,Chart I 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=StV/d I
Factor:
f-The Karman vortex street frequency which one side of vortex-maker
St-Strouhal number(dimensionless number)
V-mean flow rate
d-the width of vortex-maker
So, check the separate frequency of Karman vortex street to know the instant capacity(flow) .among, Strouhal number(St)is dimensionless number,
Chart II Show the relation of, Strouhal number(St) & Reynolds number (Re)

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 follow(2)
K=N/Q(1/m³) (2)
Model:K=instrument constant(1/m³)
N=impulse number
Q=volume flow(m³)

Certifications

Documents of product from manufacture should be Chinese/English Contrast .

Manufacture should provide a good guaranty for after-sales service , use and technical consult of maintenance , and ensure that solution is offered within 24 hours after receiving notice of buyer .

The manufacture should provide necessary conditions for the buyer coming to the factory for inspection and acceptance

Shanghai Xingshen should carry out inspection on the instruments , equipments and relevant .

Each instrument and automatic control device has permanent plates mode of corrosion resistance stainless steel . Language on the plate should be English .

. Q: How long will you give me the reply?
    A: we will contact you in 1 hours as soon as we can.Professional sales engineers 7/24 online services.
2. Q:Could you provide me the shortest lead time?
    A:We have materials in our stock,if you really need, you can tell us and we will try our best to satisfy you.And our company provides in-time delivery with safety transportation,meeting customers need.
3. Q: What is your terms of payment ?
    A: We could accept Paypal, T/T,D/P,L/C,Credit Assurance and on you request.
4. Q:Could I visit your factory?
    A: Sincerely invite you to visit our factory.
5. Q: Do you provide samples ? 
    A: Yes,we have materials in stock to help you to get the samples as soon as we can.
6. Q: How about the quality of the managements ?
    A: We have a complete quality control system, all of our products will be fully pre-inspection by QC departments before shipping to you. We have the certification of ISO, CE, HSE. we could send the certification test of our company to you.
7. Q: What is the warranty for your product ?
    A: Warranty: 1 years, Lifetime maintenance.Sales engineers and technical will be one-on-one service for you to exclude all obstacles when use our sensors.