Endress+Hauser FDU91F Ultrasonic measurement Time-of-Flight Prosonic
- Application: Hygienic level, flow
- Material: Welded 316L SS
- Range: Liquids 10m, solids 5m
- Connections: Hygienic Tri-Clamp
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Description
Endress+Hauser FDU91F: Hygienic Ultrasonic Level Measurement
The Endress+Hauser FDU91F: hygienic ultrasonic level measurement represents a pinnacle in non-contact level sensing technology, specifically engineered for demanding applications where hygiene and reliability are paramount. This advanced ultrasonic sensor is designed for continuous, maintenance-free level measurement of a wide array of substances, including fluids, pastes, sludges, and bulk materials ranging from fine powders to coarse solids. Furthermore, it capably performs flow measurement in open channels and at weirs, making it exceptionally versatile. A significant advantage of the FDU91F is its immunity to variations in dielectric constant, density, or humidity, ensuring consistent accuracy. Its integrated self-cleaning effect actively combats build-up, enhancing operational longevity and reducing maintenance needs. Crucially, the FDU91F features fully welded 316L stainless steel construction and offers hygienic process connections, making it ideally suited for industries such as food and beverage, pharmaceuticals, and biotechnology where stringent sanitary standards must be met.
Reliable Measurement For Hygienic Applications
The FDU91F ensures reliable measurement for hygienic applications through its robust construction and advanced features. The sensor is crafted from 316L stainless steel (1.4404, 1.4435), hermetically welded to provide superior chemical resistance and withstand rigorous cleaning cycles, including CIP (Clean-in-Place) at temperatures up to 135°C for 30 minutes. Available with hygienic process connections like Tri-Clamp (ISO2852), along with DN80/100 and ASME 3″/4″ options, it facilitates seamless integration into sanitary piping systems, minimizing dead spaces and potential contamination points. Its ability to operate across a broad temperature range (-40 to +105°C) and pressure range (0.7 to 4 bar abs) further enhances its suitability for demanding hygienic processes, ensuring accurate and consistent level monitoring where cleanliness is critical.
Bulk Solids Level In Silos And Crushers
This specialized FDU91F sensor is adept at bulk solids level in silos and crushers. Its ultrasonic technology effectively measures materials from fine powders to coarse aggregates, providing continuous, non-contact data essential for inventory management and process optimization. Whether you are monitoring the fill levels in large silos or tracking material flow within crushers, the FDU91F delivers accurate readings unaffected by material characteristics like humidity or particle size. The self-cleaning effect minimizes material adhesion to the sensor, crucial in dusty environments often found in bulk material handling. Coupled with its robust 316L stainless steel build and hygienic connection options, it offers a durable and sanitary solution even in challenging industrial settings, ensuring operational efficiency and product integrity.
Flow Measurement In Open Channels
The FDU91F excels in flow measurement in open channels, offering a precise and non-contact solution for monitoring water levels and flow rates. This capability is vital for managing water resources, controlling wastewater systems, and supporting various industrial processes. The sensor’s immunity to the often-corrosive or abrasive nature of fluids in open channels, combined with its self-cleaning properties, ensures sustained accuracy and minimal maintenance. It is equally effective for measuring flow at weirs, providing reliable data for hydrological studies, environmental monitoring, and compliance with regulatory standards. The FDU91F’s robust design, including its weather-resistant and flood-proof (IP 68) rating, guarantees dependable performance even in exposed outdoor environments, making it a versatile tool for hydraulic engineering and environmental management.
Explosion Protection And Chemical Resistance
Enduring explosion protection and chemical resistance are hallmarks of the FDU91F. It is certified with international explosion protection standards, including ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, and UK Ex, ensuring safe operation in hazardous atmospheres. The hermetically welded 316L sensor body provides exceptional resistance to a wide range of chemicals, making it suitable for aggressive media commonly found in processing industries. This combination of safety certifications and material resilience allows the FDU91F to be deployed confidently in potentially explosive environments and corrosive process streams, guaranteeing both operator safety and instrument longevity, even under the most demanding conditions.
TPT24: Leading Global Source Authentic Instruments
For those seeking the unparalleled performance of the Endress+Hauser FDU91F, TPT24: leading global source authentic instruments is your premier online destination. We pride ourselves on being the top global online store, providing genuine Endress+Hauser products with an unwavering guarantee of authenticity and quality. Our extensive network ensures that you receive this state-of-the-art ultrasonic sensor, regardless of your location worldwide. TPT24 is committed to delivering not just a product, but a complete solution, ensuring that your measurement needs are met with the highest standards of reliability and precision. Trust TPT24 for access to authentic, high-performance industrial instrumentation, backed by exceptional service and worldwide delivery.
Separate Installation For Harsh Conditions
The FDU91F offers remarkable adaptability through its separate installation for harsh conditions, with the sensor deployable up to 300 meters away from its transmitter. This feature is invaluable for processes involving extreme temperatures, corrosive atmospheres, or locations that are difficult to access. By housing the transmitter in a more controlled environment, such as a field housing or a top-hat rail housing within a control cabinet, the sensitive electronics are protected. This separation ensures the longevity and accuracy of the measurement system, even when subjected to rough ambient conditions. The FDU91F’s ability to maintain precise readings across this extended distance highlights its robust engineering and suitability for a diverse range of challenging industrial environments.
Integrated Heating Prevents Ice Build-Up
To ensure uninterrupted operation in colder climates, the FDU91F features integrated heating prevents ice build-up. This optional heating system is crucial for applications exposed to freezing temperatures, where ice formation on the sensor face could otherwise impede the ultrasonic signal and compromise measurement accuracy. By actively preventing ice accumulation, the FDU91F guarantees continuous, reliable level and flow monitoring throughout the year, even in harsh winter conditions. This built-in capability enhances the sensor’s already impressive weather resistance (IP 68), making it a dependable choice for outdoor installations and processes operating in environments with significant temperature fluctuations, ensuring operational continuity and data integrity.
Specifications
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Measuring principle
Ultrasonic
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Characteristic / Application
Separated version with field housing or top hat rail housing for control cabinet instrumentation, 300 m in-between sensor and transmitter
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Supply / Communication
4-wire (HART, PROFIBUS DP)
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Accuracy
+/- 2 mm + 0.17% of measured distance
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Ambient temperature
-40 °C … 105 °C
(-40 °F … 221 °F) -
Process temperature
-40 °C … 105 °C
(-40 °F … 221 °F)
CIP: 30 min: 135 °C
(30 min: 275 °F) -
Process pressure / max. overpressure limit
0.7 bar … 4 bar abs
(10 psi … 58 psi) -
Main wetted parts
316L (fully welded IP68 / NEMA 6P)
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Process connection
G / NPT 1″, DN80 / 100, ASME 3″ / 4″
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Process connection hygienic
Tri-Clamp ISO2852, DN80 3 1/2″, DN100 4″
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Blocking distance
0.3 m (1 ft)
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Max. measurement distance
Liquids: 10 m (33 ft),
Solids: 5 m (16 ft) -
Communication
Transmitter:
4 … 20 mA HART
PROFIBUS DP -
Certificates / Approvals
ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, UK Ex
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Design approvals
EN 10204-3.1
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Hygienic approvals
3A
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Components
Transmitter:
FMU90, FMU95 -
Application limits
Foam / high turbulence possible:
FDU92
For tank farms scanner:
FMU95
Data Sheet
Download Data Sheet Of:Endress+Hauser FDU91F Ultrasonic measurement Time-of-Flight Prosonic










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