Product Overview
E+H Prosonic FDU93 Ultrasonic Level Sensor
Prosonic FDU93
The Endress+Hauser Prosonic FDU93 is an advanced non-contact ultrasonic sensor designed for continuous, high-accuracy level measurement of liquids and coarse bulk solids. Built with an integrated NTC temperature compensation sensor and IP68/NEMA 6P ingress protection, it delivers stable and maintenance-free operation across demanding industrial process environments.
Continuous Non-Contact Level Measurement with Endress+Hauser Prosonic FDU93
The Endress+Hauser Prosonic FDU93 Ultrasonic Level Sensor is an industry-proven solution for continuous, non-contact level measurement in process and environmental engineering applications. Designed to handle both liquids and coarse bulk materials, the FDU93 utilizes non-contact time-of-flight acoustic technology, making it ideal for monitoring corrosive fluids, sludge, wastewater, and abrasive solid goods without sensor wear or material contamination.
Advanced Operating Principle and Echo Signal Evaluation
Operating at a nominal frequency of approximately 30 kHz, the Prosonic FDU93 emits ultrasound pulses toward the process medium surface. The reflected acoustic signal is captured by the sensor diaphragm and evaluated by a connected transmitter (such as the Prosonic S FMU90 or FMU95). By calculating the transit time of the acoustic wave, the system determines the exact material distance and level in real time. Advanced echo processing algorithms effectively suppress false echoes caused by internal tank obstructions, agitator blades, or wall buildup.
Key Features & Technical Advantages
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Extended Measurement Range: Capable of continuous level tracking up to 25 meters (82 feet) for fluids and up to 15 meters (49 feet) for coarse bulk solids.
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Integrated Temperature Compensation: Ultrasonic wave velocity varies with ambient air temperature. The FDU93 contains an internal NTC temperature sensor that automatically compensates for ambient thermal shifts, maintaining accuracy in outdoor or fluctuating thermal conditions.
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Hermetic IP68 Seal & Rugged Build: Features a fully potted, weather-resistant enclosure rated IP68 / NEMA 6P, capable of enduring prolonged submersion, heavy rain, dust, and corrosive process vapors.
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Frost Protection Option: Available with optional integrated sensor heating to prevent ice buildup on the sensor membrane in sub-zero outdoor installations.
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High Chemical Compatibility: Available with PVDF or UPVC sensor diaphragms to resist chemical attack in acidic, alkaline, or wastewater environments.
Seamless Process Automation Integration
The Prosonic FDU93 sensor connects directly to Endress+Hauser Prosonic S transmitter units. This allows seamless integration into industrial control systems (PLC/DCS) via digital communication protocols such as HART, PROFIBUS DP, or Modbus RS485. The combination of the FDU93 sensor and transmitter unit enables multi-channel measurement, open channel flow calculations, and pump control functions for water treatment works and industrial manufacturing plants.
Applications
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Wastewater & Environmental Engineering: Level monitoring in storm retention basins, sludge tanks, screen channels, open channel flow flumes, and weirs.
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Chemical Industry: Liquid storage tanks, acid/alkali holding vessels, neutralizer tanks, and chemical effluent basins.
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Bulk Material Storage: Coarse grain silos, gravel hoppers, wood chip bins, aggregate storage pits, and crushers.
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Utilities & Infrastructure: Sump pits, rainwater collection reservoirs, industrial process water basins, and raw water intake stations.
Technical Specifications
| Parameter / Feature | Specification Details |
| Measurement Principle | Ultrasonic / Time-of-Flight (Non-contact) |
| Measuring Range (Liquids) | Up to 25 m (82 ft) |
| Measuring Range (Solids) | Up to 15 m (49 ft) |
| Operating Frequency | Approx. 30 kHz |
| Process Temperature | -40 °C to +100 °C (-40 °F to +212 °F) |
| Process Pressure (Abs.) | 0.7 bar to 3 bar abs (10 psi to 44 psi) |
| Ingress Protection | IP68 / NEMA 6P |
| Diaphragm Material | PVDF or UPVC (depending on option) |
| Temperature Sensor | Built-in NTC sensor for automatic temperature compensation |
| Compatible Transmitters | Prosonic S FMU90, FMU95 transmitters |
| Hazardous Area Approvals | ATEX, FM, CSA, IECEx, TIIS (Ex-proof variants available) |
FAQ
Q1: What is the maximum measurement distance for the Prosonic FDU93?
Answer: The Prosonic FDU93 can measure liquid levels up to 25 meters (82 feet) and coarse bulk solid levels up to 15 meters (49 feet), depending on process conditions and installation.
Q2: Does the FDU93 require an external transmitter to operate?
Answer: Yes, the FDU93 sensor operates in combination with Endress+Hauser Prosonic S evaluation units (FMU90 or FMU95 transmitters) for signal processing, display, and control outputs.
Q3: How does the FDU93 handle outdoor temperature fluctuations?
Answer: The sensor features an integrated NTC temperature sensor that continuously measures ambient temperature and automatically corrects acoustic time-of-flight calculations.
Q4: Can the Prosonic FDU93 be used in explosive or hazardous environments?
Answer: Yes, the Prosonic FDU93 is available with international explosion-proof certifications, including ATEX, FM, CSA, and IECEx for hazardous dust and gas areas.
Product documents
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