Technical Characteristics and Environmental Performance
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Extended Long-Range Capability: The FDU92 stands out with a measuring range of up to 20 m (65 ft) for liquids and 10 m (33 ft) for bulk solids. This makes it ideal for large-scale infrastructure projects and industrial stockpiles where shorter-range sensors are insufficient.
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Precision Time-of-Flight Measurement: The sensor calculates distance by timing ultrasonic pulses reflected from the target surface. It includes an integrated temperature sensor to compensate for changes in the speed of sound caused by air temperature fluctuations, ensuring consistent accuracy.
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Chemical and Weather Resilience: Constructed with a hermetically welded PVDF sensor, the FDU92 offers high resistance to aggressive chemicals and vapors. Its IP 68 rating ensures it is completely weather-resistant and flood-proof, suitable for the harshest outdoor or industrial environments.
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Self-Cleaning Properties: The high-frequency vibration of the sensor membrane creates a self-cleaning effect that actively reduces the formation of build-up, moisture, or dust on the sensor face, minimizing the need for manual intervention.
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Remote Transmitter Configuration: The sensor is installed at the process point while the transmitter (FMU90/FMU95) can be located up to 300 meters away in a safe, accessible area. The transmitter automatically detects the FDU92 for rapid and simple commissioning.
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High Temperature Tolerance: With an operating range up to +95 °C, it can handle processes involving warmer liquids or solids where standard ultrasonic sensors might fail.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Ultrasonic (Non-contact) |
| Max. Range (Liquids) | 20 m (65 ft) |
| Max. Range (Solids) | 10 m (33 ft) |
| Blocking Distance | 0.4 m (1.3 ft) |
| Process Temperature | -40 to +95 °C (-40 to +203 °F) |
| Process Pressure | 0.7 to 4 bar (10 to 58 psi) |
| Sensor Material | PVDF (Hermetically welded) |
| Degree of Protection | IP 68 |
Primary Applications
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Large Wastewater Basins: Monitoring levels in deep pump stations, storm-water tanks, and primary clarifiers.
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Bulk Material Silos: Measuring levels of sand, gravel, or plastic granules in medium-to-large storage silos.
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Open Channel Flow: Measuring discharge rates in very large flumes and weirs where a high mounting position is required.
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Stockpiles and Crushers: Monitoring the height of coarse materials on belts or in crushing plants to prevent overfilling and optimize throughput.
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Hazardous Area Level Control: Fully certified with international Gas-Ex and Dust-Ex approvals for use in explosive atmospheres.
