Endress+Hauser Prosonic FDU92 – Long-Range Ultrasonic Sensor for Level and Flow Measurement
The Prosonic FDU92 is a powerful non-contact ultrasonic sensor designed for continuous measurement of liquids, pastes, sludges and bulk solids, as well as open channel flow measurement applications. Combined with Endress+Hauser FMU90/FMU95 ultrasonic transmitters, it provides a flexible and reliable solution for challenging level measurement tasks.
With a maximum measuring range of 20 m for liquids and 10 m for solids, the FDU92 is especially suitable for large tanks, silos, stockpiles and applications where a longer measuring distance is required.
Accurate Ultrasonic Measurement Without Contact
The Prosonic FDU92 uses the proven time-of-flight ultrasonic measuring principle. The sensor sends ultrasonic signals toward the medium surface and determines the level based on the return time of the reflected signal.
Since the sensor does not contact the medium, measurement is not affected by changes in conductivity, dielectric constant or density, providing stable operation across a wide range of industrial applications.
Key performance:
Measuring principle: Ultrasonic time-of-flight
Accuracy: ±2 mm + 0.17% of measured distance
Maximum measuring range:
Liquids: up to 20 m
Solids: up to 10 m
Blocking distance: 0.4 m
Process temperature: –40 to +95 °C
Process pressure: 0.7 to 4 bar abs
Sensor material: Fully welded PVDF
Protection rating: IP68 / NEMA 6P
Communication (via transmitter): HART, PROFIBUS DP
Designed for Large Tanks and Bulk Material Applications
Compared with shorter-range ultrasonic sensors, the FDU92 is optimized for applications requiring extended measurement distances.
It provides reliable performance for:
Large storage tanks
Water and wastewater basins
Chemical process vessels
Silos and hoppers
Stockpiles
Crushers and bulk material handling systems
Open channel flow measurement
The measurement principle remains stable even when the medium properties vary, making it a practical solution for many industrial level applications.
Maintenance-Free Design with Self-Cleaning Effect
The FDU92 features a fully welded PVDF sensor construction, providing excellent chemical resistance and mechanical durability.
The sensor design helps reduce material buildup through a self-cleaning effect, improving measurement reliability in applications involving:
Dusty environments
Sludge
Sticky materials
Condensation
Outdoor installations
Flexible Installation with Separate Transmitter
The FDU92 uses a separated sensor and transmitter architecture, allowing installation flexibility in demanding environments.
The sensor can be installed up to 300 m away from the transmitter, enabling the electronics to be mounted in a more convenient and protected location.
Compatible transmitters include:
This design is particularly useful for large tanks, outdoor applications and installations where access to the measuring point is limited.
Reliable Measurement Under Changing Conditions
Temperature changes can affect ultrasonic propagation speed. The FDU92 includes an integrated temperature sensor that automatically compensates for temperature variations, helping maintain accurate measurement performance.
The sensor also supports automatic detection by FMU90/FMU95 transmitters, simplifying commissioning and reducing setup effort.
Suitable for Hazardous Areas
The Prosonic FDU92 is available with international explosion protection approvals, allowing use in hazardous industrial environments.
Available approvals include:
ATEX
FM
CSA
IECEx
INMETRO
NEPSI
UK Ex
Typical industries include:
Oil & Gas
Chemical processing
Water treatment
Mining
Power generation
Bulk material handling
Frequently Asked Questions
What is the Endress+Hauser Prosonic FDU92 used for?
The FDU92 is used for continuous non-contact level measurement of liquids, pastes, sludges and bulk solids, as well as open channel flow measurement.
What is the maximum measuring range of the FDU92?
The FDU92 can measure up to 20 m for liquids and 10 m for solids.
Does the FDU92 contact the measured medium?
No. It uses a non-contact ultrasonic measuring principle, which reduces wear and maintenance requirements.
Which transmitter works with the FDU92?
The FDU92 is designed to work with Endress+Hauser FMU90 and FMU95 ultrasonic transmitters.
Can the FDU92 be used in outdoor environments?
Yes. The fully welded PVDF design with IP68/NEMA 6P protection makes it suitable for harsh outdoor conditions.
What communication protocols are available?
Communication is provided through the connected transmitter, supporting 4–20 mA HART and PROFIBUS DP.
