E+H Prosonic FDU90 Ultrasonic Level Transmitter

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).

  • 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 installation from the transmitter (up to 300m)
  • 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)
  • Integrated heating against a build-up of ice at the sensor (optional) ensures reliable measurement

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 connection: Thread
  • Temperature: -40 to +80°C (-40 to +176°F)
  • Pressure: +0.7 to +4bar (+10 to +58psi)
  • Maximum measuring range: Liquids 3m (9.8ft), solids 1.2m (3.9ft)
  • Blocking distance: 0.07m (0.23ft)
  • International explosion protection certificates
  • Measuring principle


  • 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
  • Max. measurement distance

    3 m (9.8 ft)

  • Communication

    4 … 20 mA HART
    Profibus DP

  • Certificates / Approvals


  • Options

    Second 4…20mA output

  • Components

    FMU90, FMU95

  • Application limits

    Foam / high turbulence possible:


    For tank farms scanner:


Datasheet: Prosonic S FDU90,91,91F,92,93,95 Technical Information,Operating Instructions

Flange DIN – EN -ASME – JIS

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