Endress+Hauser FTL31-AA4M3AAW5J Compact Fork Level Switch for Liquids

The Endress+Hauser FTL31-AA4M3AAW5J is a compact, tuning fork level switch designed for reliable point level detection of liquids in various industrial applications. Utilizing the proven tuning fork principle, it offers maintenance-free operation and high process safety, independent of liquid properties such as conductivity, dielectric constant, density, or viscosity.

Key Features & Benefits:

Universal Application: Suitable for a wide range of liquids, including water-based, conductive, aggressive, and viscous media.

Highly Reliable & Maintenance-Free: No moving parts, ensuring long service life and reduced operating costs. The tuning fork is self-monitoring, providing a high degree of fail-safety.

Process-Safe Detection: Insensitive to flow, bubbles, turbulence, vibrations, or buildup due to its robust mechanical design and optimized vibration characteristics.

Compact Design: The "AA4M3" housing variant with a ¾" NPT process connection is ideal for installations in tight spaces or small vessels/pipes.

Simple Installation & Setup: Quick startup via teach-in or direct push-button adjustment. No calibration required.

Hygienic Options & Robust Construction: The tuning fork is available in 316L stainless steel, making it suitable for hygienic and aggressive media. Protection class up to IP66/IP68.

Clear Status Indication: Integrated LED display for clear diagnostic and status information at a glance.

Technical Specifications (FTL31-AA4M3AAW5J):

Product Family: Levelflex FTL31

Function: Point level detection (overflow, dry-run, or intermediate level)

Operating Principle: Tuning fork (piezoelectric)

Process Connection: ¾" NPT ("AA4M3")

Fork Length: Standard (37mm)

Fork Material: Stainless Steel 1.4404 / 316L

Process Temperature Range: -50 … +150 °C (-58 … +302 °F)

Process Pressure Range: Up to 40 bar (580 psi)

Electrical Connection: M12 x1 connector

Output Signal: PNP or NAMUR (2-wire) switching output (specifics depend on ordering code)

Approvals: Typically carries CE, ATEX, IECEx, SIL for use in hazardous areas.

Typical Applications:

Overflow protection or dry-run protection in tanks, vessels, and pipelines

Pump control

Level monitoring in process technology, water/wastewater, chemical, food & beverage, and pharmaceutical industries.

Why Choose Endress+Hauser FTL31?

Endress+Hauser is a global leader in measurement instrumentation. The FTL31 series combines decades of experience in level measurement with a simple, robust design. It ensures maximum process availability, safety, and cost-efficiency.

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