FDU90/91/91F/92/93/95/96
Ultrasonic sensors for non-contact continuous
level and flow measurement,

for connection to the transmitters FMU90 and FMU95

Application
• Continuous, non-contact level measurement of fluids,
pastes, sludges and powdery to coarse bulk materials
• Flow measurement in open channels and measuring
weirs
• Maximum measuring range
– FDU90: 3 m (9.8 ft) in fluids
1.2 m 3.9 ft) in bulk materials
– FDU91/FDU91F: 10 m (33 ft) in fluids
5 m (16 ft) in bulk materials
– FDU92: 20 m (66 ft) in fluids
10 m (33 ft) in bulk materials
– FDU93: 25 m (82 ft) in fluids
15 m (49 ft) in bulk materials
– FDU95: 45 m (148 ft) in bulk materials
– FDU96: 70 m (230 ft) in bulk materials

• Suited for explosion hazardous areas
Your benefits
• Non-contact measurement method; minimizes service
requirements
• Integrated temperature sensor for time-of-flight
correction. Accurate measurements are possible, even
if temperature changes are present
• Hermetically welded PVDF sensors FDU91/92 for
fluid measurement, for highest chemical resistance
• Integrated automatical sensor detection for
transmitters FMU90, simple commissioning
• Can be installed up to 300 m (984 ft) from the
transmitter
• Suited for rough ambient conditions thanks to separate
installation from the transmitter
• Reduced build-up formation because of the selfcleaning
effect
• Integrated heating against a build-up of ice at the
sensor (optional), ensures reliable measurement
• Weather resistant and flood-proof (IP68)
• Dust-Ex and Gas-Ex certificats available (ATEX, FM,
CSA)