The FDU91F ultrasonic sensor is suitable for continuous, non-contact level measurement of liquids, pastes, sludge, powders and coarse bulk solids, is maintenance-free, and can also be used for flow measurement in open channels and weirs. The measured values are unaffected by dielectric constant, density or humidity, and the self-cleaning function of the sensor eliminates the influence of medium adhesion on the measurement. Fully welded 316L hygienic process connection; maximum measuring range: liquids 10 m (33 ft), solids 5 m (16 ft).

Benefits
Integrated temperature sensor for time-of-flight correction. Precise measurement even when the temperature changes
Hermetically welded sensor (316L, 1.4404, 1.4435) for the highest level of corrosion resistance
Suitable for use in harsh climatic conditions; sensor and transmitter can be installed separately up to 300 m apart
Sensor self-cleaning function reduces adhesion formation
Integrated automatic sensor detection for convenient commissioning with the FMU90 / FMU95 level transmitter
Degree of protection IP68
Dust-Ex and gas-Ex approval (ATEX, FM, CSA)

Applications
Continuous, non-contact level measurement of liquids and solids, suitable for silos, conveyor belts, stockpiles or crushers. Also for flow measurement in open channels and weirs. Suitable for measuring applications with low measuring heights.
Process connections: thread, clamp
Temperature: -40 ... +105°C (-40 ... +221°F)
Pressure: 0.7 ... 4 bar (10 ... 58 psi)
Maximum measuring range: liquids 10 m (33 ft), solids 5 m (16 ft)
Blocking distance: 0.3 m (1 ft)
International explosion-protection approval, hygienic approval

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Source: Endress+Hauserpublic information from the website