Critical Technical Advantages
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Robust Ceramic Technology: The sensor is crafted from 99.9% high-purity Al2O3 ceramic (Ceraphire). This “dry” measuring cell is oil-free, eliminating the risk of process contamination, and is highly resistant to abrasion and chemical attack.
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Density-Compensated Accuracy: Using HART 6.0, the device can perform density-corrected level measurements. This ensures the highest level of accuracy (up to ±0.1% in the “Platinum” version) even when the liquid density changes due to temperature fluctuations.
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Climate-Proof Electronics: The electronics are completely potted to prevent moisture ingress, and the device features a unique 2-filter pressure compensation system. This makes the sensor virtually immune to the internal condensation that often plagues submersible instruments.
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Dual Measurement Capability: The FMX21 can optionally include an integrated Pt100 sensor. This allows the device to provide a 4-20mA signal for level while simultaneously outputting highly accurate temperature data via the HART protocol.
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Specialized Application Versions: The transmitter is available in three distinct configurations tailored for specific environments:
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Drinking Water: Certified with international approvals for clean water supply.
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Wastewater & Sewage: Designed to handle sludges and contaminated liquids.
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Saltwater: Built with materials resistant to the corrosive effects of seawater and brine.
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Slimline Design: With a 22mm (0.87″) outer diameter, the drinking water version is ideally suited for monitoring deep wells and small-diameter boreholes.
Technical Performance Matrix
| Feature | Details |
| Measuring Principle | Hydrostatic (Capacitive Ceramic) |
| Accuracy | ±0.2% (Standard) / ±0.1% (Platinum) |
| Measuring Range | 0 to 20 bar / 200m H2O (0 to 300 psi) |
| Process Temperature | –10 to +70°C (14 to 158°F) |
| Output | 4 to 20mA with HART 6.0 |
| Diameter | 22 mm (0.87″) or 42 mm (1.65″) depending on version |
Primary Applications
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Deep Well Monitoring: Precision level and temperature tracking in groundwater wells and observation boreholes.
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Wastewater Treatment: Monitoring levels in primary and secondary clarifiers, sewage lift stations, and sludge tanks.
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Desalination and Marine: Level measurement in seawater intake systems and ballast tanks on ships.
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Drinking Water Management: Ensuring the safe and accurate monitoring of water towers, reservoirs, and dams.
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Environmental Protection: Long-term surface water monitoring in lakes and rivers where high stability and temperature compensation are required.
