Endress+Hauser FTL31-AA4U3BAWSJ Vibrating Fork Point Level Switch for Liquids

The Endress+Hauser FTL31-AA4U3BAWSJ is a high-performance, compact vibrating fork level switch designed for precise and reliable point level detection in liquids. Part of the trusted Liquiphant series, this robust sensor is engineered for demanding industrial applications where safety, process efficiency, and minimal maintenance are critical.

Core Benefits & Features:

Unmatched Reliability: The tuning fork principle ensures highly reliable detection, independent of flow, bubbles, foam, turbulence, or changes in liquid properties (density, conductivity, viscosity). This makes it the perfect foam-proof level switch.

Compact & Versatile Design: With a small footprint and short fork length, the FTL31 is ideal for installation in narrow pipes, small vessels, and tight spaces. The model AA4U3BAWSJ typically features a 1" NPT process connection, a 316L stainless steel fork, and food-grade PEEK coating for compatibility with a wide range of liquids, including aggressive media.

Intuitive Operation & Safety: Features like Heartbeat Technology provides continuous on-site monitoring of sensor health and functional safety. Simple one-button calibration via Teach-in allows for quick commissioning and adjustment.

Robust & Maintenance-Free: No moving parts, solid-state electronics, and a high resistance to water hammer and material buildup ensure a long service life with zero required maintenance.

Global Certifications: The instrument carries important international approvals for hazardous areas, including ATEX, IECEx, and FM certifications, making it suitable for use in potentially explosive atmospheres (Zone 1/21).

Technical Specifications (Key Details):

Product Family: Liquiphant FTL31

Process Connection: 1" NPT (other connections like G1, clamp, or flange are available in the series)

Fork Material: Stainless steel 316L with PEEK coating

Output: SPDT relay (changeover contact)

Power Supply: Wide-range supply (e.g., 24-250V AC/DC)

Process Pressure: Up to 1450 psi (100 bar)

Process Temperature: -40 to +266 °F (-40 to +130 °C)

Applications: Perfect for pump control (dry-run protection, overflow prevention), leak detection, and level alarms in tanks, vessels, and pipelines.

Primary Applications:

Overfill Protection & Empty Tank Detection in storage and process tanks.

Pump Control: Dry-running protection and alternating pump control.

Level Alarm in Pipes & Small Vessels.

Interface Detection in some applications (e.g., water/oil).

Suitable Industries: Chemical, Petrochemical, Oil & Gas, Pharmaceutical, Food & Beverage (with hygienic options), Water & Wastewater, Power Generation.

Why Choose the FTL31-AA4U3BAWSJ?

For engineers and plant managers seeking a no-nonsense, fail-safe point level switch for liquids, the Endress+Hauser FTL31 is the industry benchmark. Its proven tuning fork technology eliminates false switching, reduces downtime, and protects expensive equipment.

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