Technical Specifications
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Measurement Accuracy
±2 mm + 0.17% of measured distance
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Operating Temperature Range
-40 °C … 80 °C
(-40 °F … 176 °F) -
Pressure Range / Maximum Overpressure
0.7 bar … 4 bar abs.
(10 psi … 58 psi) -
Maximum Detection Range
Liquids: 3 m (9.8 ft),
Bulk solids: 1.2 m (3.9 ft) -
Wetted Materials
PVDF (IP68 / NEMA6P)
Application Scope
The FDU90 ultrasonic sensor provides maintenance-free, non-contact continuous level monitoring for liquids, pastes, slurries, and both fine and coarse bulk materials. It’s equally effective for open channel flow measurement applications. Measurement accuracy remains unaffected by dielectric properties, density, humidity, or surface deposits due to its self-cleaning capability. Suitable for hazardous areas, it offers maximum detection ranges of 3 m (9.8 ft) for liquids and 1.2 m (3.9 ft) for solids.
This non-contact measurement device is ideal for monitoring liquid levels and bulk materials in silos, conveyors, stockpiles, and crushers, as well as open channel flow measurement. Particularly effective in confined space applications.
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Process connection: Threaded
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Temperature range: -40 to +80°C (-40 to +176°F)
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Pressure range: +0.7 to +4 bar (+10 to +58 psi)
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Maximum detection range: Liquids 3 m (9.8 ft), bulk solids 1.2 m (3.9 ft)
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Blind zone: 0.07 m (0.23 ft)
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International explosion protection certifications
Key Benefits
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Integrated temperature sensor automatically compensates for time-of-flight variations, ensuring precision across temperature fluctuations
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Hermetically sealed PVDF sensor housing delivers exceptional chemical resistance
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Remote mounting capability (up to 300 m) enables operation in challenging environments
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Self-cleaning ultrasonic surface minimizes deposit accumulation
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Automatic sensor identification simplifies commissioning with FMU90/FMU95 transmitters
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Weatherproof and submersible design (IP 68 rated)
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Optional integrated heating prevents sensor icing for reliable winter operation
