Technical Characteristics and Field Versatility
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Advanced Diagnostics: The FMU40 features a four-line plain text display capable of showing the envelope curve. This allows for sophisticated on-site echo analysis to identify and suppress interference from tank internals or agitator blades.
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Flexible Power Options: Available in both two-wire and four-wire configurations, it can be easily integrated into standard 4 to 20 mA loops or powered independently for applications requiring higher signal strength.
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Chemical Resilience: The sensor is constructed from chemically resistant PVDF and is hermetically sealed and potted. This protects the internal transducer from corrosive vapors and ensures a long service life in harsh chemical environments.
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Simple Commissioning: With its menu-guided operation and “calibration without filling” capability, the FMU40 can be set up in minutes. The user simply enters the empty and full distances to define the measuring span.
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Integrated Temperature Compensation: An internal temperature sensor corrects the Time-of-Flight calculation in real-time, maintaining high accuracy even as the air temperature in the vessel or environment changes.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Ultrasonic (Non-contact) |
| Max. Range (Liquids) | 5 m (16 ft) |
| Max. Range (Solids) | 2 m (6.6 ft) |
| Blocking Distance | 0.25 m (0.8 ft) |
| Process Temperature | -40 to +80 °C (-40 to +176 °F) |
| Process Pressure | 0.7 to 3 bar (10 to 44 psi) |
| Sensor Material | PVDF (Hermetically sealed) |
| Degree of Protection | IP 68 (Sensor) / IP 66 (Housing) |
Primary Applications
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Agitator Tanks: Reliable level measurement even in turbulent conditions or near moving blades, thanks to adjustable echo suppression.
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Open Channel Flow: Accurate flow measurement in flumes and weirs using the built-in 32-point linearization table.
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Storage and Buffering: Monitoring chemical tanks containing acids, alkalis, or wastewater.
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Bulk Material Handling: Measuring levels in small hoppers, on conveyor belts, or at stockpile transfer points.
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Hazardous Area Installations: Fully certified for use in explosion-hazardous areas with international Gas-Ex and Dust-Ex approvals.
