Technical Characteristics and Maximum Range Performance
-
Maximum Acoustic Power: The FMU44 is optimized for distance, providing a reliable measuring range of 20 m (66 ft) for liquids and 10 m (33 ft) for bulk solids. This high-power output allows the sensor to penetrate through challenging atmospheres in tall silos and deep basins.
-
Comprehensive Signal Diagnostics: Despite its high power, the FMU44 offers precise control via its four-line plain text display. Operators can view the envelope curve on-site to verify signal strength and perform “mapping” to suppress interference echoes from internal tank obstructions.
-
Temperature-Compensated Accuracy: Because the speed of sound varies with air temperature, the FMU44 utilizes an integrated temperature sensor. This ensures that the Time-of-Flight calculation is corrected in real-time, maintaining high accuracy across the entire 20-meter span.
-
Industrial Grade Durability: The sensor is constructed from chemically resistant PVDF and is hermetically sealed. This design prevents the ingress of moisture or corrosive vapors, which is critical for sensors mounted high on outdoor silos or over aggressive chemical tanks.
-
Versatile Data Conversion: The built-in 32-point linearization function allows the transmitter to convert measured distance into any engineering unit, such as volume (m³, gallons) or flow rate (l/s, mgd) for open channel applications.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Ultrasonic (Non-contact) |
| Max. Range (Liquids) | 20 m (66 ft) |
| Max. Range (Solids) | 10 m (33 ft) |
| Blocking Distance | 0.5 m (1.9 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
-
Deep Wastewater Wells: Level monitoring in large-scale pumping stations and deep lift stations where range is critical.
-
Massive Liquid Storage: Monitoring water reservoirs, fuel depots, and chemical stock tanks up to 20 meters deep.
-
Large Bulk Solids Silos: Measuring levels of grain, cement, or ores in tall industrial silos.
-
Open Channel Flow: High-accuracy flow measurement in very large-scale municipal flumes and weirs.
-
High-Altitude Stockpiles: Monitoring the height of coarse materials in mining and aggregate stockpiles from a safe mounting distance.
