The FDU91 ultrasonic sensor is for continuous, non-contact, and maintenance-free level measurement of fluids, pastes, sludges, and powdery to coarse bulk materials. But also for flow measurement in open channels and measuring weirs. The measurement is unaffected by the dielectric constant, density, or humidity, and it is also unaffected by buildup due to the self-cleaning effect of sensors. Suited for explosion-hazardous areas. Maximum measuring range in liquids is 10m (33ft) and in solids is 5m (16ft).

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

• Integrated temperature sensor for time-of-flight correction. Accurate measurements are possible, even if temperature changes are present
• Hermetically welded PVDF sensor for highest chemical resistance
• Suited for rough ambient conditions thanks to separate installation from the transmitter (up to 300m)
• Reduced build-up formation because of the self-cleaning effect
• Integrated automatic sensor detection for transmitters FMU90/FMU95 for simple commissioning
• Weather resistant and flood-proof (IP 68)
• Integrated heating against a build-up of ice at the sensor (optional) ensures reliable measurement