Introduction
Endress+Hauser Prosonic FDU90 is a non‑contact ultrasonic sensor for continuous level and open‑channel flow measurement, compatible with FMU9x transmitters. It delivers high accuracy up to ±2 mm + 0.17% of distance, with IP68 waterproof, self‑cleaning PVDF material, and integrated temperature compensation. Suitable for liquids, pastes, sludges, and bulk solids in harsh and explosive hazardous areas.
Specifications
| Parameter | Specification |
|---|---|
| Measuring Principle | Ultrasonic |
| Max. Measuring Distance | Liquids: 3 m (9.8 ft); Solids: 1.2 m (3.9 ft) |
| Accuracy | ±2 mm + 0.17% of measured distance |
| Process Temperature | -40 °C to +80 °C (-40 °F to +176 °F) |
| Ambient Temperature | -40 °C to +80 °C (-40 °F to +176 °F) |
| Pressure Range | 0.7 bar to 4 bar abs (10 psi to 58 psi) |
| Wetted Materials | PVDF (IP68 / NEMA 6P) |
| Compatible Transmitters | FMU90, FMU95 (HART / PROFIBUS DP) |
Key Advantages
All-in-One Non-Contact Measurement
Delivers continuous, maintenance-free level measurement for liquids, pastes, sludges, and bulk solids, plus open-channel flow monitoring, unaffected by dielectric constant, density, or humidity changes.
Rugged Performance for Harsh Conditions
Hermetically sealed PVDF sensor with high chemical resistance and IP68 weather/flood protection, operating reliably from -40°C to +80°C and certified for explosive hazardous areas.
Temperature-Compensated Accuracy
Integrated temperature sensor dynamically corrects ultrasonic time-of-flight readings, ensuring stable precision even with fluctuating ambient and process temperatures.
Self-Cleaning, Low-Maintenance Design
Built-in self-cleaning effect minimizes buildup, foam, and residue on the sensor face, reducing upkeep and ensuring consistent performance over time.
Flexible Remote Installation & Easy Integration
Supports up to 300m separation between sensor and transmitter for cabinet mounting, with automatic detection for FMU90/FMU95 transmitters to simplify commissioning.