Ultrasonic measurement
Time-of-Flight
Prosonic FDU91F

Prosonic FDU91F ©Endress+Hauser
Prosonic FDU91F ©Endress+Hauser

Time-of-Flight measuring principle

Hygienic sensor for level and flow measurement for connection to FMU9x (measuring range up to 10m)

The FDU91F ultrasonic sensor for continuous, non-contact and maintenance-free level measurement of fluids, pastes, sludges and powdery to coarse bulk materials. Also for flow measurement in open channels and at weirs. Measurement is unaffected by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of sensors. Fully welded 316L with hygienic process connection available. Maximum measuring range in liquids 10m (33ft), solids 5m (16ft).

  • Benefits

    • Integrated temperature sensor for Time-of-Flight correction. Accurate measurements are possible, even if temperature changes are present

    • Hermetically welded sensors (316L, 1.4404, 1.4435) for highest chemical resistance

    • Suited for rough ambient conditions...

  • Field of application

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

    • Process connections: Thread,...

Features and specifications

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Details

  • 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 ... 105 °C
    (-40 °F ... 221 °F)

  • Process temperature

    -40 °C ... 105 °C
    (-40 °F ... 221 °F)
    30 min: 135 °C / 275 °F)

  • Process pressure absolute / max. overpressure limit

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

  • Main wetted parts

    316L (fully welded IP68 / NEMA 6P)

  • Process connection

    G / NPT 1", DN80 / 100, ASME 3" / 4"

  • Process connection hygienic

    Tri-Clamp ISO2852, DN80 (3 1/2"), DN100 (4")

  • Blocking distance

    0.3 m (1 ft)

  • Max. measurement distance

    5 m (16 ft)

  • Communication

    Transmitter:
    4 ... 20 mA HART
    Profibus DP

  • Certificates / Approvals

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

  • Design approvals

    EN 10204-3.1

  • Options

    Second 4...20 mA output

  • Components

    Transmitter:
    FMU90

  • Measuring principle

    Ultrasonic

  • Characteristic / Application

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

  • Specialities

  • Supply / Communication

    4-wire (HART, Profibus DP)

  • Accuracy

    +/- 2 mm + 0.17% of measured distance

  • Ambient temperature

    -40 °C ... 105 °C
    (-40 °F ... 221 °F)

  • Process temperature

    -40 °C ... 105 °C

    (-40 °F ... 221 °F)

    CIP: 30 min: 135 °C

    (30 min: 275 °F)

  • Process pressure absolute / max. overpressure limit

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

  • Main wetted parts

    316L (fully welded IP68 / NEMA 6P)

  • Process connection

    G / NPT 1", DN80 / 100, ASME 3" / 4"

  • Process connection hygienic

    Tri-Clamp ISO2852, DN80 3 1/2", DN100 4"

  • Blocking distance

    0.3 m (1 ft)

  • Application

  • Max. measurement distance

  • Communication

    Transmitter:
    4 ... 20 mA HART
    Profibus DP

  • Certificates / Approvals

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

  • Design approvals

    EN 10204-3.1

  • Hygienic approvals

    3A

  • Options

  • Components

    Transmitter:
    FMU90, FMU95

  • Application limits

Documents / Manuals / Software

Accessories / Spare parts

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Order code
Specification