Technical Characteristics and Chemical Defense
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Specialized Protective Coatings: The FTL62 offers a variety of high-performance coatings to ensure longevity in corrosive processes. Options include ECTFE (Halar), PFA (Edlon™, Ruby Red, or conductive versions), and Enamel. These coatings provide a seamless barrier between the aggressive media and the sensor hardware.
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SIL 2/3 Functional Safety: Developed according to IEC 61508, the FTL62 is 3rd-party approved for use in high-integrity safety loops. It includes a gas-tight feedthrough—the “Second Line of Defense”—which prevents toxic or corrosive process media from escaping into the electronics housing even if the primary sensor is compromised.
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Reliable Vibronic Technology: The tuning fork principle is unaffected by changing media properties like density, conductivity, or dielectric constant. It handles high viscosities up to 10,000 $mm^2/s$ ($cSt$), making it suitable for thick chemical slurries and pastes.
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Heartbeat Technology: This integrated suite allows for continuous internal self-diagnostics. It can specifically monitor the condition of the sensor coating and detect buildup or corrosion in real-time, enabling predictive maintenance without process interruption.
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Guided Digital Proof Testing: Periodic safety tests required by SIL or WHG are simplified via the SmartBlue App. Guided wizards lead the operator through the test, and the device automatically generates the required documentation, ensuring compliance with API 2350 standards.
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Extreme Temperature Range: The FTL62 remains operational in a wide thermal window from -60 °C to +150 °C, covering both cryogenic storage and high-temperature chemical reactions.
Technical Specification Matrix
| Feature | Technical Details |
| Measuring Principle | Vibronic (Tuning Fork) |
| Device Design | Coated extension tube version |
| Coating Options | ECTFE (Halar), PFA, Enamel |
| Process Temperature | -60 °C to +150 °C |
| Process Pressure | -1 to +40 bar (-14.5 to 580 psi) |
| Max. Viscosity | 10,000 mm2/s(cSt) |
| Output Signal | FEL61 (AC), FEL62 (DC-PNP), FEL64 (Relay), FEL68 (NAMUR), IO-Link |
| Safety & Compliance | SIL 2/3, WHG, API 2350, ATEX, IECEx |
Primary Applications
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Acids and Alkalis Storage: Reliable overfill prevention in tanks containing hydrochloric acid, sulfuric acid, or sodium hydroxide.
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Chemical Reactors: Point level detection in aggressive process vessels where turbulence and changing concentrations are common.
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Toxic Media Handling: Utilizing the second line of defense to protect personnel and the environment from hazardous chemical leaks.
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High-Viscosity Liquids: Monitoring levels of resins, polymers, or heavy chemical pastes that would stall other sensor types.
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Safety-Instrumented Systems (SIS): Serving as a critical high-level alarm in safety loops requiring SIL-rated, chemically resistant instrumentation.
