Technical Characteristics and Enhanced Power
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High-Performance Three-Phase Motor: Despite using a simple single-phase supply voltage, the FMM50 utilizes an internal converter to power a three-phase engine. This provides up to 500N of traction power, ensuring the sensing weight can be retracted even if it becomes partially buried or encounters resistance.
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Robust Fail-Safe Control: To protect downstream equipment like screw conveyors or rotary valves, the FMM50 includes a digital minimum fail-safe control. This prevents the sensor weight from descending into the silo outlet if the material level is dangerously low.
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Precision in Dust: Unlike optical or radar sensors that may struggle with extreme dust blankets during filling, the FMM50’s mechanical principle ensures a physical touch-point with the material, providing a safe measurement regardless of air clarity.
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User-Friendly Local Operation: Setup and diagnostics are performed via a 4-line plain text display with menu-guided operation, allowing for easy configuration of measuring intervals and silo dimensions.
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Certified for Hazardous Zones: The FMM50 is available with specialized certifications for dust explosion hazard zones (ATEX/IECEx Zones 20, 21, and 22), making it suitable for volatile materials like flour, coal dust, or fine chemicals.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Electromechanical (Weight and Tape/Rope) |
| Application | Powdery to coarse bulk solids, liquids |
| Measuring Range | Up to 70 m (230 ft) |
| Traction Power | Up to 500 N |
| Process Temperature | -20 to +230 °C (-4 to +446 °F) |
| Process Pressure | 0.8 to 1.1 bar (11.6 to 15.9 psi) |
| Output | 0/4-20mA, Relay (Counting pulses / Active) |
Primary Applications
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Deep Mining and Ore Silos: Measuring level in tall shafts or bunkers containing heavy, coarse minerals where high traction is required to retrieve the sensor weight.
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Large Grain Terminals: Reliable monitoring in massive silos where the measuring range can extend up to 70 meters.
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Cement and Clinker Storage: Operating in extremely dusty and abrasive environments where non-contact sensors might fail or require constant cleaning.
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Chemical Powder Processing: Managing inventory of fine-grained chemical powders that create dense dust clouds during pneumatic filling.
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Power Plants: Level detection in coal or fly ash bunkers where reliability is critical for continuous boiler operation.
