Technical Characteristics and Safety Features
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Functional Safety (SIL2/SIL3): Developed according to IEC 61508 and IEC 61511-1, the FTL50 is certified for use in safety instrumented systems. It is an ideal choice for high-integrity overfill prevention and pump dry-run protection.
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Second Line of Defense: For maximum environmental and operational safety, the FTL50 is available with a gas-tight feedthrough. This secondary containment barrier protects the electronics and prevents media leakage even if the sensor diaphragm is damaged.
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Reliable Vibronic Technology: The piezo-electrically excited tuning fork operates at a specific resonance frequency. When covered by liquid, the frequency shifts, triggering the switch. This principle is unaffected by density, conductivity, or the presence of heavy build-up.
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High-Pressure Capability: The FTL50 is designed to operate safely in process pressures up to 64 bar, making it suitable for a wide range of pressurized tanks and industrial vessels.
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Material Versatility: While 316L stainless steel is standard, the sensor can be manufactured from high-corrosion resistant alloys for use in aggressive chemical environments.
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Continuous Health Monitoring: The device actively monitors the condition of the tuning fork for mechanical damage or corrosion, ensuring the safety function remains active and reliable throughout its service life.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Vibronic (Tuning Fork) |
| Device Design | Compact version |
| Process Temperature | -50 to +150 °C (-58 to +302 °F) |
| Process Pressure | -1 to +64 bar (-14.5 to +928 psi) |
| Sensor Material | 316L Stainless Steel, Alloy (e.g., C22) |
| Output Signal | FEL51 (AC), FEL52 (DC-PNP), FEL54 (Relay), FEL58 (NAMUR), PFM |
| Safety & Compliance | SIL2/SIL3, WHG, ATEX, IECEx, Marine Approvals |
Primary Applications
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Overfill Protection: Serving as a reliable SIL-rated high-level alarm in chemical and fuel storage tanks.
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Pump Dry-Run Protection: Detecting the absence of liquid in pipes to protect pumps from overheating and damage.
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Hazardous Area Level Control: Reliable operation in Zone 0, 1, and 2 environments with international explosion protection certifications.
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High-Pressure Vessels: Level monitoring in industrial reactors and pressurized storage tanks up to 64 bar.
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Marine Applications: Certified for use on ships and offshore platforms for fuel and bilge level monitoring.
