Name: Prosonic S FDU90
Brand: Endress+Hauser
Availability: InStock

Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 3m)

Time-of-Flight measuring principle

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Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 3m)

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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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Product Support Product documentation, troubleshooting articles, device details and more.

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Ultrasonic measurement Time-of-Flight Prosonic FDU90

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What is FLEX?

FLEX selections

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Fundamental selection Meet your basic measurement needs

Lean selection Handle your core processes easily

Extended selection Optimize your processes with innovative technologies

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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.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

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Warranty terms apply

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.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

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My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

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Spare parts and accessories

Locking nuts G1, plastic PA

Order code 71395801

Wall bracket for sensor support, 316L

Order code 71452323

Sensor support 500mm, 316L

Order code 71452315

Sensor support 1000mm, 316L, US-sensor

Order code 71452316

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Spare parts and accessories

Locking nuts G1, plastic PA

Order code 71395801

Wall bracket for sensor support, 316L

Order code 71452323

Sensor support 500mm, 316L

Order code 71452315

Sensor support 1000mm, 316L, US-sensor

Order code 71452316

Spare parts & accessories

Accuracy	+/- 2mm + 0.17% of measured distance
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: 3 m (9.8 ft), Solids: 1.2 m (3.9 ft)
Main wetted parts	PVDF (IP68 / NEMA6P)
Measuring principle	Ultrasonic
Characteristic / Application	Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300m in-between sensor and transmitter
Specialities	Floating protection tube
Supply / Communication	4-wire (HART, PROFIBUS DP)
Ambient temperature	-40 °C ... 80 °C (-40 °F ... 176 °F)
Process connection	Front side thread: G / NPT 1 1/2" Rear side thread: G / NPT 1" Ceiling mounting
Blocking distance	0.07 m (0.23 ft)
Communication	Transmitter: 4 ... 20 mA HART PROFIBUS DP
Certificates / Approvals	ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, UK Ex
Options	Second 4...20mA output
Components	Transmitter: FMU90, FMU95
Application limits	Foam / high turbulence possible: FDU92 Flange-flush assembly: FDU91F For tank farms scanner: FMU95
Accuracy	+/- 2mm + 0.17% of measured distance
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: 3 m (9.8 ft), Solids: 1.2 m (3.9 ft)
Main wetted parts	PVDF (IP68 / NEMA6P)
Measuring principle	Ultrasonic
Characteristic / Application	Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300m in-between sensor and transmitter
Supply / Communication	4-wire (HART, PROFIBUS DP)
Ambient temperature	-40 °C ... 80 °C (-40 °F ... 176 °F)
Process connection	Front side thread: G / NPT 1 1/2" Rear side thread: G / NPT 1" Ceiling mounting
Blocking distance	0.07 m (0.23 ft)
Communication	Transmitter: 4 ... 20 mA HART PROFIBUS DP
Certificates / Approvals	ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, UK Ex
Options	Second 4...20mA output
Components	Transmitter: FMU90
Accuracy	+/- 2mm + 0.17% of measured distance
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: 3 m (9.8 ft), Solids: 1.2 m (3.9 ft)
Main wetted parts	PVDF (IP68 / NEMA6P)
Measuring principle	Ultrasonic
Product headline	Version with separate transmitter in field housing or top hat rail housing Cost effective solution for open channel flow measurement in water / wastewater plants
Max. measurement error	Accuracy: distance measurement: +/- 2mm + 0.17%
Measuring range	Up to 3 m / 9.8 ft
Max. process pressure	0.4 bar...4 bar (10 psi...58 psi)
Medium temperature range	-40 °C ... 80 °C (-40 °F ... 176 °F)
Degree of protection	IP68
Display/Operation	Transmitter FMU90
Outputs	Transmitter: 4 ... 20 mA HART PROFIBUS DP
Inputs	Transmitter FMU90
Digital communication	HART, PROFIBUS DP
Hazardous area approvals	ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, UK Ex

Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic measurement Time-of-Flight Prosonic FDU90

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Ultrasonic measurement Time-of-Flight Prosonic FDU90

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Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic measurement Time-of-Flight Prosonic FDU90