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ProsonicModel FDU91 -Ultrasonic Measurement Time-of-Flight

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Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 10m). The FDU91 ultrasonic sensor for continuous, non-contact and maintenance-free level measurement of fluids, pastes, sludges and powdery to coarse bulk materials. But also for flow measurement in open channels and measuring weirs. The measurement is unaffected by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of sensors. Suited for explosion hazardous areas. Maximum measuring range in liquids 10m (33ft), solids 5m (16ft).

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  • Reduced build-up formation because of the self-cleaning effect

  • Integrated automatic sensor detection for transmitters FMU90/FMU95 for simple commissioning

  • Weather resistant and flood-proof (IP 68)

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Sensor for continuous, non-contact level measurement of fluids and of bulk materials in silos, on belts, stockpiles and in crushers. Also for flow measurement in open channels and at weirs. Typically used in measurements in low structural heights.

  • Process connection: Thread

  • Temperature: -40 to +80°C (-40 to +176°F)

  • Pressure: +0.7 to +4bar (+10 to +58psi)

  • Maximum measuring range: Liquids 10m (33ft), solids 5m (16ft)

  • Blocking distance: 0.3m (1ft)

  • International explosion protection certificates

  • Measuring principle

    Ultrasonic

  • Characteristic / Application

    Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300m in-between sensor and transmitter

  • Supply / Communication

    4-wire (HART, Profibus DP)

  • Accuracy

    +/- 2mm + 0.17% of measured distance

  • Ambient temperature

    -40 °C ... 80 °C
    (-40 °F ... 176 °F)

  • Process temperature

    -40 °C ... 80 °C
    (-40 °F ... 176 °F)

  • Process pressure absolute / max. overpressure limit

    0.7 bar ... 4 bar abs
    (10 psi ... 58 psi)

  • Main wetted parts

    PVDF (fully welded IP68 / NEMA6P)

  • Process connection

    G / NPT 1"

  • Blocking distance

    0.3 m (1 ft)

  • Application
  • Max. measurement distance

    10 m (33 ft)

  • Communication

    Transmitter:
    4 ... 20 mA HART
    Profibus DP

  • Certificates / Approvals

    ATEX, FM, CSA, IEC Ex, TIIS, INMETRO, NEPSI

  • Options

    Second 4...20mA output

  • Components

    Transmitter:
    FMU90, FMU95

  • Application limits

    Foam / high turbulence possible:

    FDU92

    Flange-flush assembly:

    FDU91F

    For tank farms scanner:

    FMU95