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Low Cost High Accuracy Reliable Digital Diesel Liquid Vortex Flow Meter

Sep 05, 2016

1. Range & Series

a.(LUGB) Pipe-piezoelectric type vortex street meter

b.(LUGB) Insert-piezoelectric type vortex street meter

c.(LUGE) Pipe-capacitance type vortex street meter

d.(LUGE) Insert -capacitance type vortex street meter

e.(LUGB/E) battery supply feed type vortex street meter

f. Dive type/part body vortex street meter(order by agreement)

g. Curve-record integrating instrument, with P/T system and liquid crystal display(Chinese)

h. Integrating instrument,with Nixie tube show.

(LUGB/E)series is suitable for oil,chemical industry,metallurgy,heating power,spinning,papermaking ,etc. Be use of control: over-heating vapor, saturation vapor, compressed air, ordinary air(oxygen, nitrogen, hydrogen, natural gas, coal gas ,etc),water and liquid (water, petrol , alcohol, benzene ,etc.) 

2. 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. 

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


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 k

now 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)

3. The main technical indexes   

Nominal diameter (mm)

2540506580, 100125150200250300(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 (℃)Piezoelectric type:-40~260,-40~320;Capacitance: -40~300, -40~400,-40~450(order by agreement)
Body material1Cr18Ni9Ti, (order by agreement if need other material)
Vibrating accelerationPiezoelectric type:0.2g     Capacitance:1.0~2.0g
±1%R, ±1.5%R±1FS. plug-in:±2.5%R±2.5%FS
Range class


Service voltageSensor:+12V DC,+24V DC;Transmitter:+12V DC ,+24V DC;Battery supply feed:3.6V battery
Output signalsquare wave pulse (non- battery supply feed)

High level≥5V,low level≤1V;current:4~20mA

Loss coefficientJB/T9249 Cd≤2.4

Anti-explosion GradeExdⅡia CT2-T5, ExdⅡCT2-T5
Protection gradeIP65, IP68
Environment condition-20℃~55℃,relative humidity 5%~90%,atm press 86~106kPa
MediumGas, Liquid, Vapor
Transmission rangeThree-wire system flow sensor:≤300m, 

Electric sign of two-wire system transmitter (4~20mA):load resistance≤750Ω

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