Technical Characteristics and Reliable Performance
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Active Sensor Technology: The FTL41 uses a piezo-electrically excited tuning fork. When the fork is covered by liquid, its frequency changes; this shift is detected and converted into a switching signal. Because the sensor is “active,” it continuously verifies its own functionality, providing higher reliability than passive systems.
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Plug and Play Functionality: The device is designed for simplicity. It works out of the box without the need for calibration or specific media adjustment. This makes commissioning fast and cost-effective, even for varying liquid types.
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Superior Stability: Compared to mechanical float switches, the FTL41 offers significantly better long-term stability and repeatability of the switching point. With no mechanically moving parts, there is no wear and tear, making the device virtually maintenance-free.
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Versatile Installation: Featuring an extension tube, the FTL41 can be mounted in various positions to detect levels at specific heights. It is compatible with a wide range of process connections, from standard industrial threads and flanges to hygienic Tri-Clamp fittings.
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Robust Material Design: Constructed from 316L stainless steel, the sensor is capable of handling process pressures up to 40 bar and temperatures up to 150 °C, covering the majority of standard industrial process requirements.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Vibronic (Tuning Fork) |
| Device Design | Extension tube version |
| Process Temperature | -40 to +150 °C (-40 to +302 °F) |
| Process Pressure | -1 to +40 bar (-14.5 to +580 psi) |
| Sensor Material | 316L Stainless Steel |
| Output Signal | DC-PNP, AC/DC, Relay |
| Safety & Compliance | WHG Overfill Protection, ATEX, IECEx |
Primary Applications
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Pump Dry-Run Protection: Detecting the absence of liquid in suction lines to protect centrifugal or positive displacement pumps from catastrophic failure.
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Overfill Prevention: Acting as a reliable high-level alarm in storage tanks and process vessels to meet WHG environmental requirements.
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Industrial Cleaning Systems: Monitoring levels in tanks for detergents, solvents, or water-based cleaning agents.
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General Utilities: Level detection in cooling water loops, lubricant reservoirs, and wastewater collection pits.
