The FDU91 ultrasonic sensor is suitable for continuous, non-contact level measurement of liquids, pastes, sludge, powders and coarse bulk solids. It is maintenance-free and can also be used for flow measurement in open channels and measuring weirs. The measured value is unaffected by dielectric constant, density or humidity, and the sensor's self-cleaning function eliminates the influence of medium buildup on the measurement. Suitable for hazardous areas; maximum measuring range: liquid 10 m (33 ft), solid 5 m (16 ft).

Benefits
Built-in temperature sensor for time-of-flight calibration. Precise measurement even when the temperature changes
Hermetically welded PVDF sensor for applications with the highest corrosion resistance requirements
Suitable for harsh climatic conditions; sensor and transmitter can be installed separately at a maximum distance of 300 m
Self-cleaning sensor function reduces buildup formation
Built-in automatic sensor detection; easy commissioning when connected to the FMU90/FMU95 level transmitter
Degree of protection IP68
Optional sensor heater prevents icing and ensures reliable measured values

Application areas
Continuous, non-contact level measurement of liquids, pastes, sludge, powders and coarse bulk solids; flow measurement in open channels and measuring weirs. Maximum measuring range: liquid 10 m, solid 5 m; suitable for hazardous areas; other measuring ranges: FDU92: liquid 20 m, solid 10 m; FDU93: liquid 25 m, solid 15 m; FDU95: solid 45 m; FDU96: solid 70 m

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Source: public information from the Endress+Hauser website