Ultrasonic measurement Time-of-Flight Prosonic FDU91

Field of Application :

The FDU91 ultrasonic sensor is designed for continuous, non-contact, and maintenance-free level measurement of fluids, pastes, sludges, and powdery to coarse bulk materials. It is also suitable for flow measurement in open channels and weirs. The sensor provides accurate measurements, unaffected by dielectric constant, density, or humidity, and features a self-cleaning effect that prevents build-up.

The FDU91 is ideal for use in:

• Silos, belts, stockpiles, and crushers for bulk material level measurement
• Open channels and weirs for flow measurement
• Low structural height applications where compact sensing is required
• Explosion hazardous areas, ensuring safe operation

Key Specifications :

• Process connection: Thread
• Temperature range: -40 to +80°C (-40 to +176°F)
• Pressure range: +0.7 to +4 bar (+10 to +58 psi)
• Maximum measuring range:
  • Liquids: 10m (33ft)
  • Solids: 5m (16ft)
• Blocking distance: 0.3m (1ft)
• International explosion protection certificates

Key Features & Benefits :

Accurate and Reliable Measurement

• Integrated temperature sensor for Time-of-Flight correction ensures accurate measurements even with temperature fluctuations

Durable and Chemical-Resistant Design

• Hermetically welded PVDF sensor provides high resistance to aggressive chemicals
• Weather-resistant and flood-proof (IP68) for harsh environmental conditions

Optimized for Harsh Environments

• Suitable for rough conditions with separate installation from the transmitter (up to 300m)
• Reduced build-up formation due to the self-cleaning sensor effect
• Optional integrated heating to prevent ice build-up at the sensor for reliable measurement

Easy Installation and Operation

• Integrated automatic sensor detection for FMU90/FMU95 transmitters simplifies commissioning