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product picture of the ultrasonic flowmeter FLOWSIC550

FLOWSIC550
ultrasonic flowmeter

High pressure gas flowmeter for natural gas distribution

IFL550
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  • Measuring principle

    Ultrasonic transit time difference measurement

  • Measured variables

    Volume a. c., volumetric flow a. c., gas velocity, volume s. c. (*), volume flow under s.c. (*)
    (*) additional function included with integrated volume correction

  • Measuring Medium

    Natural gas (dry, odorized), air

  • Repeatability

    ≤ 0.1 %

  • Accuracy

    Qmin up to Qmax ≤ ± 1 %; Accuracy class 1; typical error limits
     
    Qmin up to 0.1 Qmax ≤ ± 2 %; Accuracy class 1; maximum allowed error limits
     
    0.1 Qmax up to Qmax ≤ ± 1 %; Accuracy class 1; maximum allowed error limits
    After high pressure flow calibration: ±0.2 % at test pressure; otherwise ±0.5 %

  • Medium temperature range

    –40 °C ... +70 °C

  • Operating pressure range

    ANSI300 (ASME B16.5) ≤ 48.7 bar (g); for –40 ... +70°C
     
    ANSI600 (ASME B16.5) ≤ 97.4 bar (g); for –40 ... +70°C
     
    PN40 (EN 1092-1) ≤ 40 bar (g); for –40 ... +70°C
     
    PN63 (EN 1092-1) ≤ 63 bar (g); for –40 ... +70°C

  • Nominal pipe size

    DN 50 (2") … DN 150 (6")

  • Metrological approvals and certificates

    MID: 2014/32/EU
    OIML R 137-1&2:2012
    EN 12405: 2010 (for integrated volume correction)
    AGA 9, 2022

  • Hazardous area approvals

    IECEx:
    Ex ia [ia Ga] T4 IIB Gb
     
    ATEX:
    II 2 (1)G Ex ia [ia Ga] T4 IIB Gb
     
    NEC/CEC (US/CA):
    Class I Division 1, Groups C, D T4 Ex ia [ia Ga] IIB T4 Gb
    Class I, Zone 1 AEx ia [ia Ga] IIB T4 Gb

  • Digital Outputs

    2x Pulse and Status (HF with fmax = 2kHz, LF with fmax = 10 Hz)
     
    2x RS485, external powered
     
    Encoder
    HF pulses + malfunction, electrically isolated (fmax = 2 kHz)
     
    Encoder + LF pulses, electrically isolated (fmax = 100 Hz)
     
    Encoder + HF pulses, not electrically isolated (fmax = 2 kHz)
     
    2x pulses, HF and LF, electrically isolated (fmax = 2 kHz / 100 Hz)

  • Digital communication

    Modbus RTU
    Modbus ASCII

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