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Ultrasonic measurement
Time-of-Flight
Prosonic FDU90

Prosonic FDU90 ©Endress+Hauser
Prosonic FDU90 ©Endress+Hauser

Time-of-Flight measuring principle

  • Prosonic FDU90
  • Prosonic FDU90

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 3m)

The FDU90 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 3m (9.8ft), solids 1.2m (3.9ft).

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  • Benefits

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

    • Hermetically welded PVDF sensor for highest chemical resistance

    • Suited for rough ambient conditions thanks to separate...

  • Field of application

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

    • Process...

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

  • Specialities

    Floating protection tube

  • 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 (IP68 / NEMA6P)

  • Process connection

    Front side thread:

    G / NPT 1 1/2"

    Rear side thread:

    G / NPT 1"

    Ceiling mounting

  • Blocking distance

    0.07 m (0.23 ft)

  • Application

    Application

  • Max. measurement distance

    Max. measurement distance

  • Communication

    Transmitter:
    4 ... 20 mA HART
    Profibus DP

  • Certificates / Approvals

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

  • Options

    Second 4...20mA output

  • Components

    Transmitter:
    FMU90, FMU95

  • Application limits

    Foam / high turbulence possible:

    FDU91

    For tank farms scanner:

    FMU95

  • 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 (IP68 / NEMA6P)

  • Process connection

    Front side thread:

    G / NPT 1 1/2"

    Rear side thread:

    G / NPT 1"

    Ceiling mounting

  • Blocking distance

    0.07 m (0.23 ft)

  • Max. measurement distance

    1.2 m (3.9 ft)

  • Communication

    Transmitter:
    4 ... 20 mA HART
    Profibus DP

  • Certificates / Approvals

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

  • Options

    Second 4...20mA output

  • Components

    Transmitter:
    FMU90

  • Measuring principle

    Ultrasonic

  • Product headline

    Version with separate transmitter in field housing or top hat rail housing
    Cost effective solution for open channel flow measurement in water / wastewater plants

  • Max. measurement error

    accuracy:
    distance measurement: +/- 2mm + 0.17%
    resolution:
    distance measurement: 1m

  • Measuring range

    max measuring distance up to 3 m / 9.8 ft

  • Max. process pressure

    atm.

  • Medium temperature range

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

  • Degree of protection

    IP68

  • Display/Operation

    Transmitter

  • Outputs

    Transmitter:
    4 ... 20 mA HART
    PROFIBUS DP

  • Inputs

    Transmitter

  • Digital communication

    HART, PROFIBUS DP

  • Hazardous area approvals

    ATEX, IECEx, FM, CSA

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