• LUGB Vortex flow meters

LUGB Vortex flow meters

LUGB Vortex flow meter
1.Accuracy: Liquid Gas 1% Steam 1.5%
2.Temperature:-20oC to +350oC
3.Measure :Liquid Gas Steam
4.ISO

Product Details

Quick Details

Description

LUGB Vortex flow meters

 

inside nominal diameter (mm)

25,40,50,65,80,100,125,150,200,250,300,(300~1000 plug-in)

nominal pressure (MPa)

DN25-DN200 4.0(>4.0 order by agreement),DN250-DN300 1.6(>1.6 order by agreement)

medium temperature (°C)

piezoelectric type:-40~260,-40~320;capacitance: -40~300, -40~400,-40~450(order by agreement)

noumenon

1Cr18Ni9Ti,(order by agreement if need other material)

vibrating acceleration

piezoelectric type:0.2g     capacitance:1.0~2.0g

range

±1%R,±1.5%R,±1FS;plug-in:±2.5%R,±2.5%FS

Range degree

1:6~1:30

service voltage

sensor:+12V DC,+24V DC;transmitter:+12V DC ,+24V DC;battery supply feed:3.6V battery

output signal

square wave pulse (non- battery supply feed):high level≥5V,low level≤1V;current:4~20mA

loss coefficient

JB/T9249 Cd≤2.4

anti-explosion sign

Ben-an type:ExdⅡia CT2-T5 anti-explosion type:ExdⅡCT2-T5      

Protection grade

ordinary type IP65     dive type IP68

environment condition

Tem-20°C~55°C,relative humidity 5%~90%,atm press 86~106kPa

medium

gas,liquid,vapor

transmission range

three-wire system flow sensor:≤300m,electric sign of two-wire system transmitter (4~20mA):load resistance≤750Ω

 

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,Chart I as follow.

                                chart I

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)

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