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Location:Home > english > Product > Flow meter
FVS intelligent vortex street flowmeter
View: Pubdate:2022-04-27


Product overview 

The FVS intelligent vortex street flowmeter is of good medium adaptive capacity, can be used to directly measure the volume flow under the working condition of steam, air, gas, water and liquid, and equipped with temperature and pressure sensor to measure the volume flow rate and mass flow rate under standard conditions. The parameters is capable of long-term stable working. The piezoelectric stress sensor can be used to work under the operating temperature scope of -20℃~+250℃. There is a simulated standard signal and a digital pulse signal output. It can be used with computer and other digital systems and is an advanced and ideal flow instrument. It's applicable to all fields (such as petroleum, chemical engineering, thermal power generation, lithium battery new energy industry, metallurgy, food, environmental protection and hydraulic engineering). 

Operating principle:   

The FVS vortex street flowmeter is constituted by vortex generator, detection probe and corresponding electronic circuit designed in the flow field. When the fluid flows through the vortex generator, two alternating rows of vortexes are formed on two ends of it, and such vortex is called as Karman Vortex Street. Strouhal proposed that the frequency of Karman Vortex Street was proportional to the flow rate of the fluid based on the theory of Karman Vortex Street and provided the relationship between frequency and velocity: 

f = St × V/d, wherein: 

f: frequency of occurrence of vortex street (Hz) 

V: mean flow rate on both sides of vortex generator (m/s) 

St: Strouhal 's coefficient (constant) 


These alternating vortexes form a series of alternating negative pressures which act on the detection probe to produces a series of alternating electrical signals and output the pulse frequency signal proportional to vortex synchronization (or standard signal) after conversion, shaping and amplification processing by the pre-amplifier.   


Product features 

● It can be used to measure the volume flow rate and mass flow rate of steam, gas and liquid. 

● It can be used to realize the continuous flow disassembly of sensor and the amplifier is separated from the sensor (separation distance: 15m).  

● The disturbance elimination circuit and vibration sensing head are used to make the instrument have a certain resistance to environmental vibration.

● Small pressure loss, wide measuring range and scope reaching to 10-40 times. 

● No mechanical moving parts, long-term stability, simple structure and convenient installation and maintenance.   

●Medium temperature measured: +350℃ (+450℃).

Technical parameters 

● Measuring medium: Liquid, general gas, natural gas and steam 

(saturated steam and superheated steam) 

● Possible measurement scope: Reynolds number: 5×103~7×106  

● Normal measurement scope: Reynolds number: 2×104~7×106  

● Flow velocity measurement scope: Liquid: 0.5~7m/s, gas: 4~35mm/s, 

steam: 7~70m/s  

● Temperature of measured fluid: -40℃~+300℃  

● Temperature of measured fluid: 1.6, 4 and 25MPa  

● Accuracy: Level 1, 1.5 and 0.5 (reaching to Level 0.5 by nonlinear trimming); 

● Repeatability: 0.2% of indicated value;   

● Surface material: ICr18Ni9Ti;   

● Pressure loss: △=1.2×r×V2×10-6  Wherein: △P-pressure loss r-density of measured fluid (Kg/m3)  v-mean velocity in the tube (m/s)  ambient temperature: -20℃~+55℃ (description about ordering goods as per special requirements); 

● Ambient humidity: ≤90%RH;           ● Atmospheric pressure: 86-106KPa; 

● External power supply: 3.6~224VDC;   ● Internal power supply: 3~4.5VVDDC; 

● Working power supply: 80/A;           ● Operating voltage: 2.7~3.6v; 

● Working frequency: 0.1~3000H;        ● Signal remote transmission distance: 100mm; 

● Signal output: Pulse output (external power supply) Current output: 4~20mADC (two-wire system external 24VDC power supply)  Either pulse output or current output can be chosen   


  Product model selection 


FVS

Intelligent vortex street flowmeter

Diameter/flow scope (/h)

DN25

1~10(liquid)         25~60 (gas)

Check the specification for steam flow and recommend the use of plug-in vortex street flowmeter in case of above DN300

DN32

1.5~18(liquid)        15~150 (gas)

DN40

 2.2~27(liquid)       22.6~150 (gas)

DN50

4~55(liquid)        35~350 (gas) +Q.

DN80

9~135(liquid)       90~900 (gas)

DN100

14~200(liquid)        140~1400 (gas)

DN150

 32~480(liquid)        300~3000 (gas)

DN200

56~800(liquid)       550~5500 (gas)

Function 1


N

No temperature and pressure compensation

Y

With temperature and pressure compensation

Output type


F1

4-20mA output (two-wire system)

F2

4-20mA output (three-wire system)

F3

RS485 communication interface

Measured medium


J1

Liquid

J2

Gas

J3

Steam

Connection type


L1

Flange clamping type

L2

Flange connection type

Function 2

(communication interface)

E1

Level 1.0

E2

Level 1.5

T1

Normal temperature

T2

High temperature

T3

Steam

P1

1.6MPa

P2

2.5MPa

P3

4.0MPa

D1

Internal 3.6V power supply

D2

DC24V power supply

B1

Stainless steel

B2

Carbon steel

FVS-









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