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CX-VFMVortexFlowMeter

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CX-VFMVortexFlowMeter

CX-VFM Vortex Flow Meter


Working principle
To install a vortex generator(bluff body)in the fluid,which can produces regular vortex at both sides of the vortex generator altematively.Such vortex is called Karman Vortex.Vortex trains are asymmetrically arranged at the downstream of the vortex geberator. Suppose the generating frequency of the vortex is f,the average speed of the incoming flow of the tested medium is V,the head-on width of the vortex generator is d,and the diameter of the flowmeter is D,and base on the principles of Karman Vortex,the following relations will be obtained
cart(1)
f=StV/dFormula (1)
Note:f- Suppose the generating frequency of the vortex
St-Strouhal number
V-average flow velocity at both sides of the vortex generator
d- the vortex geberator body width
Thus, by measuring the Carmen frequency of vortex separation of instantaneous flow rate can be calculated. Among them, Strouhal number ( St ) is a dimensionless unknown, Figure ( two) said the Strouhal number ( St ) and Reynolds number ( Re ) relationship.
chart(2)
In the curve St = 0.17straight section, whirlpool release frequency and velocity proportional to, namely the vortex flow sensor measurement range. As long as the detected frequency f can be obtained within the tube by the flow rate of the fluid, flow velocity and volume flow rate V. The measured pulse number and volume ratio, called the instrument constant ( K ), see type (2)
K=N/Q(1/mFormula (2)
K=Instrument constant(1/m)
N=Pulse number
Q=Volume flow(m)
Main technical indexUnit(1)

Nominal diameter(mm)2540506580100125150200
250300(300~1000 Insert type)
Nominal pressure (MPa)DN25-DN200 4.0(>4.0 Supply agreement)
DN250-DN300 1.6(>1.6 Supply agreement)
Medium temperature(℃)Piezoelectric type:-40~260-40~320Capacitance type
-40~300, -40~400-40~450(Supply agreement)
Body material1Cr18Ni9Ti(Other materials supply agreement)
Allowable vibration accelerationPiezoelectric type:0.2gCapacitance type:1.0~2.0g
Accuracy±1%R±1.5%R±1FSInsert type:±2.5%R±2.5%FS
Range of1:6~1:30
Power supply voltageSensor:+12V DC+24V DCTransmitter:
+12V DC +24V DCBattery type:3.6V Battery
Output signalSquare wave pulse ( not including the battery power supply type ):
high level or low level5V,1V; current: 4~ 20mA
Pressure loss coefficientIn line with the JB / T9249standard Cd = 2.4
Explosion proof marksIntrinsic safety type: Exd IA CT2-T5 flameproof type: Exd CT2-T5
Protection gradeThe ordinary IP65 diving type IP68
Environmental conditionsTemperature - 20~ 55,5% ~ 90% of relative humidity,
atmospheric pressure is 86 ~ 106kPa
Applicable mediumGas, liquid, steam
Transmission distanceThree wire system pulse output type: < 300m,
two line standard current output type
(4 ~ 20mA ): load resistance less than 750ohm
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