Specs at a glance
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Accuracy
+/- 2 mm + 0.17% of measured distance
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Process temperature
-40 °C ... 80 °C
(-40 °F ... 176 °F) -
Process pressure / max. overpressure limit
0.7 bar ... 4 bar abs
(10 psi ... 58 psi) -
Max. measurement distance
Liquids: 10 m (33 ft),
Solids: 5 m (16 ft) -
Main wetted parts
PVDF (fully welded IP68 / NEMA6P)
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).
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
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
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Predecessor
Success stories
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Technical Information (TI)
Prosonic S FDU91
English version - 05/2021
Ultrasonic measuring technology
EN More 31/05/202114/09/2020Language:
English
Version:
31/05/2021
File size:
802.7 KB
File name:
TI01470FEN_0221.pdf
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Technical Information (TI)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95
English version - 01/2018
Ultrasonic measuring technology
EN More 25/01/201808/09/201516/01/201302/04/201231/03/2011Language:
English
Version:
25/01/2018
File size:
1013 KB
File name:
TI00396FEN_1818.pdf
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Technical Information (TI)
TI Khafagi-Venturi QV302 to QV316
Flow measurement
EN Select other language 27/08/202418/05/2022Language:
English
Version:
27/08/2024
File size:
496.2 KB
File name:
TI01681FEN_0224-00.pdf
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Technical Information (TI)
TI Weld-in adapter, process adapter and flanges
Level, pressure and temperature measurement
EN Select other language 06/12/202425/03/202415/09/202328/10/202130/07/2021Language:
English
Version:
06/12/2024
File size:
1.3 MB
File name:
TI00426FEN_2624.pdf
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Technical Information (TI)
Prosonic S FDU91
Ultrasonic measuring technology
EN Select other language 31/05/202114/09/2020Language:
English
Version:
31/05/2021
File size:
802.7 KB
File name:
TI01470FEN_0221.pdf
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Technical Information (TI)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95
Ultrasonic measuring technology
EN Select other language 25/01/201808/09/201516/01/201302/04/201231/03/2011Language:
English
Version:
25/01/2018
File size:
1013 KB
File name:
TI00396FEN_1818.pdf
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Technical Information (TI)
FAU40 alignment unit
Installation accessory for ultrasonic or microwave sensors with cable
connectionEN Select other language 01/03/202106/09/200501/07/2003Language:
English
Version:
01/03/2021
File size:
446.3 KB
File name:
TI00179FEN_1021.pdf
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Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92
II 2 G Ex ma IIC T5 Gb
II 2 G Ex ma IIC T6 GbEN Select other language 14/06/202113/04/201631/12/201001/07/200721/08/2006Language:
English
Version:
14/06/2021
File size:
403.2 KB
File name:
XA00321FEN_1521.pdf
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Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95
Ex ma IIC T* Gb
Ex ta/tb IIIC T** Da/Db
Ex tb IIIC T** DbEN Select other language 27/06/202222/01/2015Language:
English
Version:
27/06/2022
File size:
429.4 KB
File name:
XA01343FEN_0222-00.pdf
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Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92
Ex ma IIC T* Gb
EN Select other language 27/06/202222/01/2015Language:
English
Version:
27/06/2022
File size:
413.2 KB
File name:
XA01342FEN_0222-00.pdf
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Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92
II 2 G Ex ma IIC T5 Gb
II 2 G Ex ma IIC T6 GbLanguage:
English
Version:
20/12/2021
File size:
401.3 KB
File name:
XA02642FEN_0121-00.pdf
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Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95
II 2 G Ex ma IIC T5 Gb
II 2 G Ex ma IIC T6 Gb
II 1/2 D Ex ta/tb IIIC Txx°C Da/Db
II 2 D Ex tb IIIC Txx°C DbLanguage:
English
Version:
20/12/2021
File size:
416.7 KB
File name:
XA02643FEN_0121-00.pdf
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