Endress+Hauser FDU90-RG4AA Ultrasonic measurement Time-of-Flight Prosonic FDU90 Field of application The FDU90 ultrasonic sensor 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 b...