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Vortex Flowmeter
  • KVFN Vortex Flowmeter is a kind of stress type vortex flowmeter based on the karman vortex principle to measure flow and has the advantage of high signal-to-noise ratio, high sensitivity, good zero stability. Signal processing circuit adopts microcomputer technology and packages the CPU unit, storage unit, display unit, communication unit and other function modules in the circuit board, at the same time, there are RS - 485 interface, Hart protocol, ModBus protocol for chosen. Diameter ranges of DN15~DN300, widely applied in measuring volume flow and mass flow of superheated steam, saturated steam, compressed air, general

     

  • Unique Features:


    Sensor adopts adaptive signal processing circuit which got the national practical new type patent certificate.

    By lots of wave analysis of vortex flow sensor in a long time, Shanghai Kent has designed the most scientific probe shape, wall thickness, height, probe rod diameter and matching piezocrystal, adopts advanced CNC to machine to ensure technical parameters of proper alignment and smooth finish etc., and with special treating process to maximatily overcome existed signal influence by intrinsic self-oscillation frequency.

    Advanced processing equipment and technology makes meter and its components with strong generality, so will not affect accuracy and repeatability if change any parts and no need calibration.


    General Features:

    Best of KVFN Intelligent Vortex Flow Sensor is piezocrystal built in bluff body to avoid fluid turbulence caused by external type, no zero drift, and high repeatability.

    Simple & fixed structure, no moving parts, high reliability, convenient maintenance. Wide measuring range, turndown ratio can reach 10:1 in Reynolds Number 2×104 ~ 7×106.

    Detecting element does not contact with the measured fluids directly, stable performance and long service life. High accuracy, ±1.0% for measuring liquid, and 1.5% for gas.

    Output pulse signal and current signal directly proportional to flowrate, and have RS-485, Hart, ModBus communication for convenient computer networking.

    Low pressure loss, just 1/4 ~ 1/2 of orifice plate.

    Application:

    Wide application, can measure flowrate of steam, gas, liquid etc.


     

  • Measured fluid: Saturated steam, overheated steam, gas, liquid (avoid multi-phase fluid):

    Installation Type

    Measured Fluid

    Accuracy

    Repeatability

    Pipe Type

    Gas (incl. steam)

    ±1.5%

    0.50%

    Liquid

    ±1.0%

    0.33

    Inserted  Type

    Gas

    ±3.0%

    1.00%

    Liquid

    ±2.5%

    0.83%

     

    Measuring Range:
    Gas(incl. steam): 7~55m/s (7~50m/s for DN≥200)
    Liquid: 0.7~5.5m/s

    Rated Pressure:
    GB 1.6MPa, 2.5MPa, 4.0MPa, 6.4MPa
    DIN PN16, PN25, PN40
    JIS 10K, 20K, 40K
    ANSI Class150, Class300, Class600

    Medium Temperature:
    -40~+250℃ (-40~+120℃ for inserted)
    +100~+350℃ (high temp.)

    Installation Type:

    Piped Vortex Flow Transducer
    Instered Vortex Flow Transducer

    Parts Material:
    Transducer Body: 340SS
    Bluff Body: 304SS
    Detecting Probe: 316SS
    Connecting Rod: 304SS
    Radiator: A-alloy
    Gasket: High Temperature Resistance Asbestos, NBR, Graphite

    Power Supply:
    24V DC
    3.6V Lithium Battery ( Local Display)
    Double Power Supply (24V DC, 3.6V Lithium Battery)

    Output Signal: Pulse, 4~20mA, RS-485, Hart, Modbus

    Electric Terminal: M20*1.5

    Protection Grade: IP65

    Explosion Proof: Flameproof Exd II BT3~6, Instrinsical Safe Exia II CT3~6

    Body Process: SS Sand-blast for Transducer Body, Plastic Coating for Amplifier Cover

    Ambient Temperature:
    -35~60℃ (No LCD)
    -5~60℃ (With LCD)

    Relative Humidity: 5~95%

     

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