Technical Characteristics and Measuring Performance
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Flexible Rope Design: The rope sensor allows for precise measurement in tall vessels where a rigid rod would be impractical or impossible to install. This design also simplifies transportation and installation in facilities with limited overhead space.
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Conductivity Independence: In liquids with a conductivity of 100 μS/cm or higher, the measurement becomes independent of the dielectric constant ($dc$). This enables the FMI52 to accurately measure different liquids without the need for on-site recalibration when the medium changes.
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Extreme Process Resilience: The FMI52 is built to endure demanding conditions, operating reliably in temperatures from -80 °C up to +200 °C and handling pressures from vacuum to 100 bar.
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Build-up Immunity: The high-quality PFA or FEP insulation ensures that the sensor remains accurate even if sticky or viscous liquids coat the rope, focusing the measurement on the true liquid surface.
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Safety and Digital Readiness: Certified for SIL2 safety systems and WHG overfill prevention, the device also features two-stage overvoltage protection. When paired with Fieldgate technology, it integrates seamlessly into global inventory management systems via the internet.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Capacitance (Continuous) |
| Probe Length | 0.42 to 10.0 m (1.38 to 33 ft) |
| Medium Conductivity | Independent of dc if > 100 μS/cm |
| Process Temperature | -80 to +200 °C (-112 to +392 °F) |
| Process Pressure | Vacuum to 100 bar (1,450 psi) |
| Materials (In-process) | 316L, PFA, FEP (Corrosion-resistant) |
| Output | 4…20mA HART, PROFIBUS PA |
Primary Applications
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Large Liquid Storage: Continuous level tracking in tall bulk storage tanks for fuels, oils, and water-based chemicals.
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Deep Process Vessels: Monitoring levels in chemical reactors or large mixing tanks where high temperatures and pressures are present.
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Wastewater Management: Level measurement in deep collecting basins or lift stations where aggressive media are handled.
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Inventory Management: Remote monitoring of stock levels in large distributed tank farms to optimize logistics and replenishment.
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Marine and Offshore: Certified for use in the deep fuel and ballast tanks of ships and offshore platforms.
