Technical Characteristics and Environmental Focus
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Condensate-Resistant Contite Cell: The sensor is completely protected against moisture ingress, which is critical for measurements in damp environments such as water basins or wells. This design ensures minimal temperature effects and long-term stability.
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Foam-Independent Measurement: Because the device measures the hydrostatic pressure (weight) of the liquid column, the accuracy remains unchanged even if a thick layer of foam forms on the surface of the medium.
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Rigid Rod Construction: The rod version is ideal for applications where the sensor must be positioned at a specific depth and maintained in a stable orientation, preventing the sensor from moving due to moderate agitation or flow.
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High Reference Accuracy: With a standard accuracy of ±0.2% and a high-precision option of ±0.1%, it provides reliable data for both process control and inventory management.
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Safety and Drinking Water Approvals: The FMB51 is certified for use in SIL2 safety systems and carries specific approvals for drinking water applications, ensuring it meets the stringent safety and purity standards of the environmental sector.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Hydrostatic Pressure |
| Probe Design | Rigid Rod with fixed connection |
| Measuring Range | 0.1 to 10 bar / 100 m $H_2O$ (1.5 to 150 psi) |
| Accuracy | ±0.2% (Standard); ±0.1% (Optional) |
| Process Temperature | -10 to +85 °C (14 to 185 °F) |
| Output | 4…20mA HART, PROFIBUS PA, FF |
| Approvals | SIL2, WHG, Drinking Water (e.g., NSF, KTW) |
Primary Applications
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Water and Wastewater Treatment: Monitoring levels in storage basins, filtration tanks, and clear water reservoirs.
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Environmental Monitoring: Measuring water levels in wells, shafts, and dams where the probe must reach deep into the medium.
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Aggressive Media: Reliable level tracking for chemicals and paste-like media in the environmental industry.
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Open and Pressurized Tanks: Accurate measurement in vented tanks or vessels with internal pressure up to the limit of the measuring cell.
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Safety-Critical Systems: Serving as an overfill prevention or dry-run protection sensor in systems requiring functional safety up to SIL2.
