Endress+Hauser FTL31-AA4U2AAWBJ Compact Fork Level Switch for Liquids

The Endress+Hauser FTL31-AA4U2AAWBJ is a high-quality, compact fork level switch designed for reliable point level detection of liquids in a wide range of industrial applications. This page provides a detailed product overview, key features, and technical specifications to help you understand its capabilities.

Product Overview & Applications

The FTL31 is a versatile tuning fork level sensor that detects the presence or absence of liquids at a specific point. The model FTL31-AA4U2AAWBJ is a specific configuration featuring a 1" NPT process connection, Hastelloy C22 wetted parts, and a compact housing. Its robust design makes it ideal for:

• Tanks, Containers, and Small Vessels: Overfill protection, dry-run protection, and pump control.

• Chemical & Petrochemical Industry: Reliable detection of aggressive media thanks to Hastelloy construction.

• Pharmaceutical & Food & Beverage: Hygienic design options and suitability for CIP (Cleaning-in-Place) processes.

• Water & Wastewater: Level control in sumps, basins, and treatment tanks.

• General Industrial Liquids: Reliable switching for oils, fuels, coolants, and more.

Key Features & Benefits for Your Operation

• Universal Liquids Detection: Unaffected by flow, bubbles, turbulence, foam, or changes in liquid properties (density, conductivity, viscosity).

• Compact and Robust Design: The "Compact" housing is ideal for installations with limited space. The Hastelloy C22 forks provide excellent corrosion resistance.

• Maintenance-Free Operation: No moving parts, ensuring long service life and reduced maintenance costs.

• Simple Installation and Calibration: The tuning fork is self-adjusting upon first immersion. No calibration required; it is essentially plug-and-play.

• High Reliability & Safety: Proven tuning fork technology with high switching repeatability. SIL 2 capable according to IEC 61508.

• Process-Specific Adaptations: The "WBJ" option indicates Viton seals and a food-grade certificate, making it suitable for applications with stricter hygiene requirements.

Technical Specifications at a Glance

• Model: FTL31-AA4U2AAWBJ

• Product Family: FTL31 Compact Fork Level Switch

• Process Connection: 1" NPT (AA4)

• Wetted Parts Material: Hastelloy C22 (U2)

• Housing: Compact, Aluminum (AA)

• Seal Material: Viton (W)

• Special Option: Food-grade certificate (J)

• Operating Pressure: Up to 145 psi (10 bar)

• Operating Temperature: -40 to +248 °F (-40 to +120 °C)

• Output: SPDT electromechanical relay

• Power Supply: 24-250 VAC/DC (wide range)

• Protection Rating: IP66/IP67, NEMA 4X