Product Overview
E+H Prosonic FMU30 Ultrasonic Level Transmitter
Prosonic FMU30
The Endress+Hauser Prosonic FMU30 is a compact, cost-effective ultrasonic transmitter engineered for continuous non-contact level measurement of liquids and coarse bulk solids. Featuring non-contact time-of-flight acoustic technology, menu-driven local operation, and integrated temperature compensation, it provides accurate level monitoring in storage tanks, open channels, and sumps.
Compact Non-Contact Level Measurement with Endress+Hauser Prosonic FMU30
The Endress+Hauser Prosonic FMU30 Ultrasonic Level Transmitter is a versatile and compact instrument designed for continuous, non-contact level and open-channel flow measurement. Perfect for entry-level process automation applications, the FMU30 provides dependable level tracking for fluids, slurries, and coarse bulk materials across municipal water treatment, effluent processing, chemical storage, and light industrial plants.
Non-Contact Time-of-Flight Acoustic Technology
Operating on the proven ultrasonic time-of-flight principle, the Prosonic FMU30 emits high-frequency acoustic pulses that bounce off the product surface back to the sensor element. The transmitter converts acoustic transit time directly into precise distance, material level, or volume values without contacting the medium. Because the sensor does not come into contact with process liquids or abrasive solids, it eliminates mechanical wear, chemical erosion, and product buildup, ensuring long service life with minimal maintenance.
Key Performance Features & Operational Advantages
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Dual Sensor Options: Available with 1½” (measuring range up to 5 m for liquids / 2 m for solids) and 2″ (measuring range up to 8 m for liquids / 3.5 m for solids) thread options to suit diverse vessel sizes and installation geometries.
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Integrated Temperature Compensation: Sound speed varies with air temperature fluctuations. The FMU30 incorporates an internal temperature sensor that automatically adjusts acoustic transit-time calculations to maintain high accuracy under varying weather conditions.
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On-Site Envelope Curve Display: Features an intuitive four-line liquid crystal display (LCD) that provides menu-driven setup and real-time echo envelope curve visualization for fast, straightforward on-site diagnostics.
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Durable IP68 Enclosure: Built with polypropylene (PP) wetted parts and an IP68/NEMA 6P hermetically sealed housing, the FMU30 resists weather, outdoor humidity, dust, and aggressive vapors.
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Global Hazardous Area Approvals: Certified under international explosion-proof standards including ATEX, CSA C/US, IECEx, and NEPSI for safe operation in hazardous dust and gas environments.
System Integration & Linearization
The Prosonic FMU30 delivers a standard 2-wire 4–20 mA output signal for effortless integration into programmable logic controllers (PLCs), distributed control systems (DCS), or local panel indicators. Pre-programmed linearization curves allow direct volumetric measurement in horizontal cylindrical tanks, spherical vessels, or flow rate calculations in open channels, flumes, and weir gates.
Target Applications
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Water & Wastewater Treatment: Level monitoring in sewage pump basins, lift stations, equalization tanks, grit chambers, and sludge holding pits.
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Open Channel Flow Measurement: Flow rate calculation in Parshall flumes, Venturi flumes, V-notch weirs, and open discharge canals.
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Liquid Storage Tanks: Process water storage, chemical additive tanks, rainwater collection basins, and oil/water separators.
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Coarse Bulk Solid Storage: Small grain hoppers, aggregate storage bins, sand pits, and wood pellet hoppers.
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Industrial Utilities: Cooling tower sumps, drainage basins, effluent collection pits, and raw water intake reservoirs.
Technical Specifications
| Parameter / Feature | Technical Specification |
| Measuring Principle | Ultrasonic / Time-of-Flight (Non-contact) |
| Max. Range (1½” Sensor) | Liquids: Up to 5 m (16 ft) | Bulk Solids: Up to 2 m (6.6 ft) |
| Max. Range (2″ Sensor) | Liquids: Up to 8 m (26 ft) | Bulk Solids: Up to 3.5 m (11 ft) |
| Blocking Distance | 1½” Sensor: 0.25 m (0.8 ft) | 2″ Sensor: 0.35 m (1.15 ft) |
| Measurement Accuracy | ±3 mm or ±0.2 % of set measuring range |
| Output / Signal | 2-wire, 4–20 mA |
| Process Temperature | -20 °C to +60 °C (-4 °F to +140 °F) |
| Process Pressure (Abs.) | 0.7 bar to 3 bar abs (10 psi to 44 psi) |
| Wetted Materials | PP (Polypropylene) / EPDM |
| Process Connection | G / NPT 1½” or G / NPT 2″ Thread (Optional UNI Flanges) |
| Ingress Protection | IP68 / NEMA 6P |
| Hazardous Approvals | ATEX, CSA C/US, IECEx, NEPSI |
FAQ
Q1: What is the maximum measurement range of the Prosonic FMU30?
Answer: The maximum measuring range depends on the sensor version and medium: the 1½” sensor version measures up to 5 m for liquids and 2 m for solids; the 2″ sensor version measures up to 8 m for liquids and 3.5 m for solids.
Q2: Can the Prosonic FMU30 be used for open channel flow measurement?
Answer: Yes, the FMU30 includes built-in linearization functions for calculating flow rates in standard flumes and weirs (such as Parshall or Venturi channels).
Q3: How does the FMU30 compensate for temperature variations?
Answer: The transmitter features an integrated NTC temperature sensor that continuously measures ambient temperature and automatically adjusts acoustic time-of-flight calculations.
Q4: Is the Prosonic FMU30 suitable for outdoor installations?
Answer: Yes, the FMU30 features an IP68/NEMA 6P weather-resistant housing designed for harsh outdoor ambient environments.
Product documents
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