Technical Characteristics and Advanced Signal Processing
-
High-Power Long-Range Performance: The FMU42 is optimized for larger vessels, providing reliable measurement up to 10 m in liquids and 5 m in bulk solids. This makes it ideal for tall silos and deep pump stations where smaller transmitters lack the necessary acoustic power.
-
Sophisticated Diagnostic Display: The four-line plain text display allows for the visualization of the envelope curve directly at the device. This provides critical insight into signal quality and allows for the manual suppression of interference echoes from tank internal structures like ladders or support beams.
-
Integrated Temperature Compensation: Changes in air temperature significantly affect the speed of sound. The FMU42 includes an internal temperature sensor that automatically corrects the Time-of-Flight calculation, ensuring accuracy even in outdoor installations subjected to sun and wind.
-
Robust Flange Mounting: Unlike the threaded versions, the FMU42 comes with a flange connection as standard. This simplifies installation on large nozzles and provides a more secure, pressure-stable mounting point for industrial reactors and storage tanks.
-
Hermetically Sealed PVDF Sensor: The transducer is completely potted and sealed within a PVDF housing. This ensures the device is immune to moisture ingress and highly resistant to aggressive chemical vapors, preventing corrosion and reducing maintenance.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Ultrasonic (Non-contact) |
| Max. Range (Liquids) | 10 m (33 ft) |
| Max. Range (Solids) | 5 m (16 ft) |
| Blocking Distance | 0.4 m (1.3 ft) |
| Process Temperature | -40 to +80 °C (-40 to +176 °F) |
| Process Pressure | 0.7 to 2.5 bar (10 to 36 psi) |
| Sensor Material | PVDF (Hermetically sealed) |
| Degree of Protection | IP 68 (Sensor) / IP 66 (Housing) |
Primary Applications
-
Large Storage Tanks: Level monitoring for water, fuels, and chemical stocks in tanks up to 10 meters high.
-
Wastewater Management: Reliable level detection in deep wet wells, settling tanks, and storm-water overflow basins.
-
Open Channel Flow: High-accuracy flow measurement in large-scale flumes and weirs using the 32-point linearization table.
-
Bulk Solids Hoppers: Monitoring levels of sand, gravel, or grain in medium-sized silos or above conveyor systems.
-
Hazardous Area Monitoring: Fully certified for use in explosion-hazardous areas with international Gas-Ex and Dust-Ex approvals.
