Technical Characteristics and Design
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Extended 30m Measuring Range: The FMR20B provides the power needed for larger storage tanks, tall silos, and deep lift stations. Its 80 GHz technology maintains a narrow beam angle across this entire range, preventing interference from narrow vessel walls or internal obstructions.
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Heartbeat Technology: A significant upgrade for the basic segment, Heartbeat Technology enables on-demand device verification and advanced diagnostics. Operators can verify the sensor’s accuracy and health according to quality standards without interrupting the process, significantly reducing maintenance downtime.
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Bluetooth Remote Access: With an encrypted Bluetooth connection, the device can be configured and monitored from a smartphone or tablet via the SmartBlue app. This is particularly valuable for sensors installed in hazardous areas or hard-to-reach locations like sewer shafts or atop tall silos.
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It’s Me-Function: To ensure the correct device is being configured in a plant with multiple sensors, the “It’s me-function” triggers a flashing LED on the connected device. The integrated LED also provides immediate visual feedback on the device status (e.g., normal operation, maintenance required, or error).
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Guided Setup Wizards: Complexity is minimized through step-by-step setup sequences. These wizards guide the user through commissioning and even the Heartbeat verification process, ensuring high-quality installation without the need for extensive manual study.
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Versatile Solids and Liquids Handling: Beyond standard liquids, the FMR20B is capable of measuring powdery and granular bulk solids, even in pneumatic conveying systems where dust and air movement are present.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Free-space Radar (80 GHz) |
| Measuring Range | Up to 20 m (66 ft) / 30 m (98 ft) options |
| Accuracy | ±2 mm (0.08″) |
| Process Temperature | -40 to +80 °C (-40 to +176 °F) |
| Process Pressure | -1 to +3 bar (-14.5 to +43 psi) |
| Communication | 4-20 mA HART, Modbus, Bluetooth |
| Protection Class | IP66 / IP68 / NEMA 4X/6P |
Standard Applications
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Sewer and Lift Station Management: Reliable level tracking in humid and corrosive environments where ultrasonic sensors often fail due to condensation or foam.
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Open Channel Flow: Measuring the head level in flumes and weirs to calculate flow rates in wastewater treatment plants.
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Large Stockpiles and Bunkers: Continuous level monitoring of minerals, sand, or coal in mining and construction sites.
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IBC and Chemical Storage: Monitoring levels in intermediate bulk containers, even through the plastic wall of the vessel.
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Food and Beverage Utilities: Managing silos for dry ingredients like flour or sugar, and liquid storage for auxiliary fluids.
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River and Flood Monitoring: Long-range measurement of water levels for environmental safety and early warning systems.
