The FDU90 ultrasonic sensor is for continuous, non-contact, and maintenance-free level measurement of fluids, pastes, sludges, and powdery to coarse bulk materials. Additionally, it can measure the flow in open channels and weirs. The measurement is unaffected by dielectric constant, density, or humidity and also unaffected by buildup due to the self-cleaning effect of sensors. Suited for explosion-hazardous areas. Maximum measuring range in liquids is 3m (9.8ft) and in solids is 1.2m (3.9ft).

• Process connection: Thread
• Temperature: -40 to +80°C (-40 to +176°F)
• Pressure: +0.7 to +4bar (+10 to +58psi)
• Maximum measuring range: Liquids 3m (9.8ft), solids 1.2m (3.9ft)
• Blocking distance: 0.07m (0.23ft)
• 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