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Ultrasonic measurement
Prosonic FMU90

Transmitter in housing for field or top hat rail mounting for up to 2 sensors FDU90/91/92/93/95

  • Prosonic FMU90 top hat rail housing ©Endress+Hauser
  • Prosonic FMU90 field housing ©Endress+Hauser
  • Time-of-Flight measuring principle

Prosonic FMU90 separated version with field housing or top hat rail housing for control cabinet instrumentation are suited for continuous, non-contact level measurement of fluids, pastes, sludge and powdery to coarse bulk solids. Also the flow measurement in open channels and weirs is possible as the simultaneous measurement of level and flow in a storm water overflow basin with only 1 sensor. Up to 6 relays for tendency alarm, flow pulse output or backwater/sludge alarm, 1 or 2 channel version.


  • Simple, menu-guided operation with 6-line plain text display, 15 languages selectable

  • Envelope curves on the display for quick and simple diagnosis

  • Easy operation, diagnosis and measuring point documentation with the supplied "FieldCare" operating program

  • Time-of-Flight correction via integrated or external temperature sensors

  • Linearisation (up to 32 points, freely configurable) for the most common flumes and weirs
    pre-programmed and selectable

  • Online calculation of the flume-/weir-flows via integrated flow curves

  • Automatic detection of the sensors FDU9x

Field of application

Level measurement of fluids and bulk materials with 1 or 2 sensors for measuring of up to 45m (148ft) and level limit detection. Pump control, rake control and as option: additional pump control function.

  • Calculations: Average, difference, sum

  • Application flow: Flow measurement in open channels and weirs with 1 or 2 sensors

  • Flow measurement with back water or sludge detection

  • Up to 3 totalizers and 3 counters

  • Counting or time pulse output for control of external units

Features and specifications

Documents / Manuals / Software

Accessories / Spare parts

Predecessor / Successor

Predecessor: DU42C, DU42S, DU43C, DU43S, DU73C, DU73S, FHU42, FHU43, FHU73, Prosonic FMU860, Prosonic FMU861, Prosonic FMU862

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Endress+Hauser Inc.
2350 Endress Place Greenwood , IN 46143 United States
Tel.: 888-363-7377
Fax: 317-535-8498
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