Technical Characteristics and Ease of Use
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Conductive Medium Specialist: The FMI21 is optimized for liquids with a conductivity of at least 30 $\mu S/cm$. As long as this threshold is met, the measurement is entirely independent of the liquid’s dielectric constant ($dc$), ensuring a stable signal even if the liquid composition changes slightly.
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Factory Preconfigured: To simplify installation, the device is preconfigured at the factory from 0% to 100% based on the probe length ordered. This means the sensor is ready to use immediately upon installation without the need for complex on-site calibration.
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On-Site Adaptability: The carbon fiber rod is designed to be easily shortened on-site. This allows you to adjust the probe length to the exact dimensions of your tank, reducing the need for precise pre-ordering and allowing for flexible storage.
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Robust and Maintenance-Free: With no moving parts, the FMI21 is not subject to mechanical wear or jamming. The use of carbon fiber and 316L stainless steel ensures high resistance to corrosion in harsh environments.
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Inventory Integration: When used with Fieldgate FXA320, the FMI21 becomes part of a remote monitoring system, allowing you to check inventory levels via the internet for logistical optimization.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Capacitance (Continuous) |
| Medium Conductivity | $\geq$ 30 μS/cm |
| Probe Length | Up to 2.5 m (8 ft) |
| Process Temperature | -40 to +100 °C (-40 to +212 °F) |
| Process Pressure | Vacuum to 10 bar (145 psi) |
| Materials (In-process) | 316L, Carbon Fiber (CFR), PP |
| Output | 4…20 mA |
Primary Applications
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Water and Wastewater: Monitoring levels in cisterns, rain basins, and utility water tanks.
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Chemical Storage: Reliable level tracking for smaller tanks containing acids, lye, or cleaning agents.
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Agricultural Tanks: Level monitoring for liquid fertilizers or water troughs.
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Small Process Vessels: Cost-effective continuous level measurement in industrial skids and small-scale manufacturing.
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Overfill Prevention: Certified with WHG (German Water Resources Act) for use as a reliable overfill prevention system.
