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Ultrasonic measurement
Time-of-Flight Prosonic FDU93

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 25m)

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Ultrasonic measurement
Time-of-Flight Prosonic FDU93

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 25m)

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Benefits

  • Integrated temperature sensor for Time-of-Flight correction. Accurate measurements are possible, even if temperature changes are present
  • 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)
  • Non-contact measurement method minimizes service requirements
  • International Dust-Ex and Gas-Ex certificates available
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Ultrasonic measurement
Time-of-Flight Prosonic FDU93

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Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

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The manufacturer's warranty and extended warranty are subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

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Product information

Prosonic FDU93 - Ultrasonic measurement
Ultrasonic - Prosonic FDU93
Specifications
Continuous / Liquids
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Description

The FDU93 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 25m (85ft), solids 15m (50ft).

Field of application

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 +95°C (-40 to +203°F)
  • Pressure: +0.7 to +3bar (+10 to +43psi)
  • Maximum measuring range: Liquids 25m (85ft), solids 15m (50ft)
  • Blocking distance: 0.6m (2ft)
  • International explosion protection certificates
Benefits
  • Integrated temperature sensor for Time-of-Flight correction. Accurate measurements are possible, even if temperature changes are present
  • 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)
  • Non-contact measurement method minimizes service requirements
  • International Dust-Ex and Gas-Ex certificates available
Predecessors
Prosonic FDU83, FMU801
Downloads
Most downloaded
Technical Information (TI)
TI Prosonic S FDU93 Ultrasonic measuring technology
English version - 03/2026
Download
Technical Information (TI)
FAU40 alignment unit Installation accessory for ultrasonic or microwave sensors with cable
connection
English version - 03/2021
Download
Technical Information (TI)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95 Ultrasonic measuring technology
English version - 01/2018
Download
The CAD Drawings will be available after the configuration.
All downloads
61 Downloads
Technical Information (TI)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95 Ultrasonic measuring technology
English version - 01/2018
Download
Technical Information (TI)
Most downloaded
FAU40 alignment unit Installation accessory for ultrasonic or microwave sensors with cable
connection
English version - 03/2021
Download
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
Technical Information (TI)
Most downloaded
TI Prosonic S FDU93 Ultrasonic measuring technology
English version - 03/2026
Download
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** Db
English version - 06/2022
Download
Ex Safety Instruction (XA)
Prosonic S FDU93, FDU95 Ex ta/tb IIIC T**°C Da/Db X
Ex tb IIIC T**°C Db X
English version - 07/2022
Download
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 Db
English version - 12/2021
Download
Ex Safety Instruction (XA)
Prosonic S FDU93, FDU95 Ex tD A20/21 IP65 T*
English version - 05/2021
Download
Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95 Ex ma IIC T5 Gb
Ex ma IIC T6 Gb
Ex tD A20/21 IP65 T*
English version - 05/2021
Download
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 Db
English version - 06/2021
Download
Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95, FDU96 IECEx BVS 08.0012
Ex ma IIC Tx Gb
Ex ta/tb IIIC Txx°C Da/Db IP68
Ex tb IIIC Txx°C Db IP68
English version - 12/2010
Download
Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95 EAC: 2Ex nA IIC T6...T3 Gc Ex tc IIIC T55...95°C Dc Safety Instructions Ultrasonic Level Measurement
English version - 12/2018
Download
Ex Safety Instruction (XA)
Safety Instructions Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95 II 3 G Ex nA IIC T5 Gc (FDU90)
II 3 G Ex nA IIC T6 Gc (FDU91-93/95, FDU91F)
II 3 D Ex tc IIIC Txx°C Dc
EG 05 024
English version - 04/2016
Download
Ex Safety Instruction (XA)
Prosonic S FDU90, FDU91, FDU91F, FDU92, FDU93, FDU95 II 3 G Ex ec IIC T5 Gc
II 3 G Ex ec IIC T6 Gc
II 3 D Ex tc IIIC Txx°C Dc
English version - 12/2021
Download
Ex Safety Instruction (XA)
Prosonic S FDU93, FDU95 II 1/2 D Ex ta/tb IIIC Txx°C Da/Db
II 2 D Ex tb IIIC Txx°C Db
English version - 12/2021
Download
Ex Safety Instruction (XA)
Prosonic S FDU93, FDU95, FDU96 IECEx BVS 08.0012
Ex ta/tb IIIC Txx°C Da/Db IP68
Ex tb IIIC Txx°C Db IP68
English version - 12/2010
Download
Ex Safety Instruction (XA)
Prosonic S FDU93, FDU95 II 1/2 D Ex ta/tb IIIC Txx°C Da/Db
II 2 D Ex tb IIIC Txx°C Db
English version - 06/2021
Download
Ex Safety Instruction (XA)
Prosonic S FDU91, FDU91F, FDU92, FDU93, FDU95 1Ex ma IIC T5 Gb X
1Ex ma IIC T6 Gb X
Ex ta/tb IIIC T**°C Da/Db X
Ex tb IIIC T**°C Db X
English version - 07/2022
Download
Fields of Activities (FA)
Misura di livello Misura di livello
Panoramica dei prodotti per
applicazioni in liquidi e solidi sfusi
Italian version - 06/2026
Download
Fields of Activities (FA)
Catálogo Medición y Detección de nivel Gama de productos para aplicaciones con líquidos y sólidos
Spanish version - 06/2022
Download
Fields of Activities (FA)
レベル計 総合カタログ 液体および粉体アプリケーション向けレベル計・レベルスイッチ
Japanese version - 12/2025
Download
Fields of Activities (FA)
Misura di livello Misura di livello
Panoramica dei prodotti per applicazioni in liquidi e solidi sfusi
Italian version - 03/2023
Download
Fields of Activities (FA)
Füllstandsmesstechnik Produktübersicht für Anwendungen in Flüssigkeiten und Schüttgütern
German version - 10/2022
Download
Fields of Activities (FA)
Level measurement Product overview for applications in liquids and bulk solids
English version - 03/2026
Download

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Spare parts and accessories

Sensor support 500mm, 316L

Order code 71452315

Sensor support 1000mm, 316L, US-sensor

Order code 71452316

Mounting bracket Prosonic S, Micropilot

Order code 71093130

Bracket 700mm, 316L

Order code 71452327
Spare parts & accessories
Prosonic FDU93 - Ultrasonic measurement
Ultrasonic - Prosonic FDU93

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Ultrasonic - Prosonic FDU93
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Spare parts and accessories

Sensor support 500mm, 316L

Order code 71452315

Sensor support 1000mm, 316L, US-sensor

Order code 71452316

Mounting bracket Prosonic S, Micropilot

Order code 71093130

Bracket 700mm, 316L

Order code 71452327
Spare parts & accessories