Endress+Hauser Prosonic FMU30 – Ultrasonic Level Transmitter

The Prosonic FMU30 is a compact, cost-effective ultrasonic transmitter designed for continuous, non-contact level and flow measurement. It can be used with liquids, pastes and coarse bulk solids, making it a practical solution for general-purpose level measurement.

The instrument combines ultrasonic Time-of-Flight measurement with integrated signal processing and a local four-line plain text display, allowing measurement values, warnings and diagnostic information to be viewed directly at the installation point.

Reliable Non-Contact Level Measurement

The FMU30 determines the distance to the product surface using ultrasonic waves, so there is no probe or mechanical sensing element in contact with the measured material.

This makes it suitable for applications where a simple, low-maintenance level measurement solution is preferred, including process water tanks, wastewater treatment, storage tanks, loading tanks and buffer tanks.

Key Advantages

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  Ultrasonic Time-of-Flight measurement
  
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  Continuous, non-contact level measurement
  
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  Suitable for liquids, pastes and coarse bulk solids
  
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  ±3 mm accuracy or ±0.2% of the set measuring range
  
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  Maximum measuring distance up to 8 m for liquids
  
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  Maximum measuring distance up to 3.5 m for bulk solids
  
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  4–20 mA output
  
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  Two-wire instrument
  
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  Integrated four-line plain text display
  
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  On-site display of envelope curves and diagnostic information
  
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  Threaded G / NPT 1½" and 2" process connections
  
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  PP/EPDM main wetted parts
  
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  International explosion protection approvals available
  

Practical Solution for Water and Storage Applications

The FMU30 is particularly well suited to applications where measurement requirements are straightforward and a cost-effective instrument is preferred.

Typical applications include:

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  Wastewater treatment plants
  
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  Process water tanks
  
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  Storage tanks
  
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  Buffer tanks
  
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  Loading tanks
  
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  Liquid storage and inventory monitoring
  
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  Coarse bulk solid measurement
  

For liquids, the 1½" sensor can measure up to 5 m, while the 2" sensor can measure up to 8 m. For bulk solids, the corresponding maximum measuring distances are 2 m and 3.5 m.

Easy On-Site Diagnostics

A useful feature of the FMU30 is its integrated four-line plain text display. Warning and alarm messages can be viewed directly on the instrument, while the envelope curve can also be displayed for measurement analysis.

This provides technicians with immediate access to measurement and diagnostic information without requiring a separate display device, helping simplify troubleshooting during commissioning and maintenance.

Compact Design for General Industrial Use

The FMU30 uses a compact transmitter design with threaded process connections. Its main wetted parts are made from PP/EPDM, and the specified process temperature range is -20 to +60 °C.

The instrument is designed for process pressures from 0.7 to 3 bar absolute, so it is best suited to atmospheric or low-pressure applications rather than high-pressure vessels.

Main Technical Parameters

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  Measurement principle: Ultrasonic / Time-of-Flight
  
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  Measurement: Continuous non-contact level and flow
  
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  Application: Liquids, pastes and coarse bulk solids
  
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  Accuracy: ±3 mm or ±0.2% of set measuring range
  
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  Maximum range for liquids: Up to 8 m
  
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  Maximum range for bulk solids: Up to 3.5 m
  
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  Process temperature: -20 to +60 °C
  
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  Process pressure: 0.7 to 3 bar abs
  
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  Output: 4–20 mA
  
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  Power / communication: Two-wire
  
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  Process connection: G / NPT 1½" or 2"
  
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  Main wetted parts: PP/EPDM
  
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  Blocking distance: 0.25 m for 1½" sensor; 0.35 m for 2" sensor
  
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  Display: Four-line plain text display
  
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  Approvals: ATEX, CSA C/US, IECEx, NEPSI depending on configuration
  

FAQ

What is the Prosonic FMU30 used for?

The FMU30 is used for continuous, non-contact level and flow measurement of liquids, pastes and coarse bulk solids.

What is the maximum measuring range?

For liquids, the maximum measuring distance is 5 m with the 1½" sensor and 8 m with the 2" sensor. For bulk solids, the maximum distances are 2 m and 3.5 m, respectively.

What is the accuracy of the FMU30?

The specified accuracy is ±3 mm or ±0.2% of the set measuring range, depending on the application and measurement conditions.

Is the FMU30 a radar level transmitter?

No. The FMU30 uses ultrasonic Time-of-Flight technology, rather than radar technology.

What output does the FMU30 provide?

The FMU30 is a two-wire instrument with a 4–20 mA output.

Can the FMU30 measure bulk solids?

Yes. It can measure coarse bulk solids, with maximum measuring distances of up to 2 m or 3.5 m depending on the selected sensor.

What is the operating temperature?

The specified process temperature range is -20 to +60 °C.

Does the FMU30 have a local display?

Yes. The FMU30 features a four-line plain text display that can show measured values, warning and alarm messages, as well as the envelope curve for diagnostics.