Introduction
The Endress+Hauser Liquiphant FTL51B is a digital vibronic point level switch designed for universal liquid media detection in process industry applications. Certified for SIL2/SIL3 safety use, it delivers reliable high/low level detection unaffected by flow, foam, gas bubbles, or buildup. Its modular design supports optional pipe extensions up to 6m, hygienic Tri-Clamp connections, and Heartbeat Technology for continuous diagnostics. With Bluetooth connectivity and the SmartBlue App, it enables simple on-site testing and documentation, making it ideal for safety-critical overfill protection and pump control tasks.
Key advantages
1. SIL2/3 Certified Safety Performance: Designed to IEC 61508 standards for SIL2/3 applications, providing reliable, third-party verified safety for overfill protection systems.
2. Extreme Operating Range Versatility: Handles process temperatures from -50°C to +150°C and pressures up to 100 bar, with optional compatibility down to 0.4 g/cm³ media density.
3. Smart Diagnostics & Testing: Heartbeat Technology enables continuous diagnostics without process interruption, while guided wizards simplify periodic SIL/WHG compliance testing.
4. Flexible Installation & Communication: Supports Tri-Clamp hygienic connections, pipe extensions up to 6m, and multiple outputs including HART, Bluetooth, NAMUR, and relays.
5. Universal, Media-Independent Detection: Reliable performance unaffected by flow, foam, gas bubbles, or buildup, eliminating false trips in challenging process conditions.
Specification
| Parameter | Specification |
|---|---|
| Measuring Principle | Vibronic (Tuning Fork) for Liquids |
| Process Temperature Range | -50 °C to +150 °C (-58 °F to +302 °F) |
| Process Pressure Range | Vacuum to 100 bar (Vacuum to 1450 psi) |
| Minimum Medium Density | 0.5 g/cm³ (0.4 g/cm³ optional) |
| Max. Sensor Length | Up to 6 m (19.7 ft) |
| Wetted Parts Material | 316L Stainless Steel, Alloy |
| Safety Approvals | SIL2/SIL 3 (IEC 61508), WHG Overfill Protection |
| Communication Protocols | HART, Bluetooth, NAMUR, PFM, Relay |
| Process Connections | Thread, Flange, Tri-Clamp hygienic connection |
| Certifications | ATEX, IECEx, CSA, NEPSI, Marine approvals (ABS/LR/BV/DNV) |