Introduction
The Endress+Hauser Prosonic FDU91 is a robust ultrasonic sensor designed for continuous, non-contact level and open-channel flow measurement. With a measuring range up to 10m and compatibility with FMU9x transmitters, it delivers reliable readings for liquids, slurries, and bulk solids. Its self-cleaning design, chemical-resistant construction, and wide operating temperature range make it ideal for demanding industrial applications.
Specifications
| Item | Details |
|---|---|
| Measuring Principle | Ultrasonic |
| Accuracy | ±2 mm + 0.17% of measured distance |
| Max. Measuring Distance | Liquids: 10 m; Solids: 5 m |
| Process Connection | G / NPT 1" |
| Wetted Parts | PVDF (fully welded IP68 / NEMA6P) |
| Ambient / Process Temp | -40 °C … 80 °C |
| Communication | 4…20 mA HART, PROFIBUS DP |
| Certifications | ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, UK Ex |
Key Advantages
Broad Application Versatility
Provides reliable, non-contact level and open-channel flow measurement across liquids, sludges, and bulk solids, unaffected by density, humidity, or dielectric fluctuations.
Superior Chemical & Environmental Durability
The hermetically welded PVDF sensor and IP68 rating deliver exceptional chemical resistance and protection against harsh, weather-prone conditions.
Highly Flexible Installation
Supports remote deployment with up to 300 meters of separation between the sensor and transmitter, ideal for complex layouts and hard-to-reach areas.
Low-Maintenance, Self-Cleaning Design
An integrated self-cleaning effect actively reduces material buildup and fouling, ensuring consistent performance with minimal upkeep.
Consistent Accuracy in Challenging Conditions
Integrated temperature compensation and optional anti-icing heating maintain precise measurements, even with significant temperature changes or freezing risks.