Endress+Hauser E+H Time-of-Flight Prosonic Fdu91 Ultrasonic Measurement Level Sensor
Product Description
Field of application
The FDU91 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 by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of sensors. Suited for explosion hazardous areas. Maximum measuring range in liquids 10m (33ft), solids 5m (16ft).
Ultrasonic measurement Time-of-Flight Prosonic FDU91
Sensor for continuous, non-contact level measurement of fluids and of bulk materials in silos, on belts, stockpiles and in crushers. Also for flow measurement in open channels and at weirs. Typically used in measurements in low structural heights.
Process connection: Thread
Temperature: -40 to +80°C (-40 to +176°F)
Pressure: +0.7 to +4bar (+10 to +58psi)
Maximum measuring range: Liquids 10m (33ft), solids 5m (16ft)
Blocking distance: 0.3m (1ft)
International explosion protection certificates
Temperature: -40 to +80°C (-40 to +176°F)
Pressure: +0.7 to +4bar (+10 to +58psi)
Maximum measuring range: Liquids 10m (33ft), solids 5m (16ft)
Blocking distance: 0.3m (1ft)
International explosion protection certificates
Benefits
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
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
Specification
Specification | Details |
Measuring Principle | Time - of - flight Ultrasonic |
Application | For continuous, non - contact level measurement of liquids, pastes, sludges, powders and bulk solids. Also suitable for flow measurement in open channels and measuring weirs. Applicable to explosion - hazardous areas. Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300 m in-between sensor and transmitter |
Application limits | Foam / high turbulence possible: FDU92 Flange-flush assembly: FDU91F For tank farms scanner: FMU95 |
Measuring Range | Liquids: 10 m (33 ft); Solids: 5 m (16 ft) |
Blocking Distance | 0.3 m (1 ft) |
Measuring Accuracy | ±2 mm + 0.17% of the measured distance |
Process Temperature | - 40°C to + 80°C (-40°F to + 176°F) |
Process Pressure | 0.7 bar to 4 bar abs. (10 psi to 58 psi) |
Main Wetted Parts | PVDF (fully - welded, IP68 / NEMA 6P) |
Process Connection | G / NPT 1" |
Power Supply | Usually used with a transmitter, and the specific power supply is determined by the transmitter. Commonly used transmitters support 24 VDC ± 10% |
Output Signal | Transmitter: 4 - 20 mA HART, optional: second - way 4 - 20 mA output |
Digital Communication | PROFIBUS DP, HART |
Protection Level | IP68 |
Certificate | ATEX, IECEx, FM, CSA |
Features | Integrated temperature sensor for time - of - flight correction; Hermetically welded PVDF sensor with high chemical resistance; Self - cleaning effect to reduce build - up; Can be installed separately from the transmitter, with a maximum distance of 300 m |
