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The Endress+Hauser FTL31-AA4M2BAWDJ is a high-quality, tuning fork level switch designed for reliable point level detection of liquids in a wide range of industrial applications. This page provides detailed information for engineers, plant managers, and procurement specialists.
Product Overview: Tuning Fork Level Detection
The FTL31-AA4M2BAWDJ operates on the proven tuning fork principle. Two vibrating forks oscillate at their mechanical resonant frequency. When the forks are covered by liquid, the frequency changes dramatically. This change is detected by the integrated electronics, triggering a solid-state or relay switching output. The device is immune to product buildup, bubbles, foam, turbulence, and changes in liquid properties like conductivity, density, or viscosity.
Key Features & Benefits
Universal Application: Suitable for water, oils, chemicals, solvents, and aggressive liquids. The specific "AA4M2BAWDJ" model features a Hastelloy C22 wetted parts and a PTFE coating, making it ideal for highly corrosive and abrasive media.
Compact Design: The small tuning fork (size 1") allows for easy installation in tight spaces, such as small nozzles, pipes, or reactor vessels.
High Reliability & Safety: No moving parts, ensuring minimal wear and maintenance. Safe for use in hazardous areas (ATEX, IECEx certifications available depending on exact configuration).
Simple Installation & Setup: The device is pre-calibrated for most liquids. Plug-and-play installation with a variety of process connections (e.g., ¾" NPT, 1" NPT, G1, clamp). The robust design withstands high pressure and temperature.
Clear Output: Provides a clear PNP or relay switch signal for pump control, overfill protection, low-level alarm, or dry-run protection.
Technical Specifications (Highlights)
Model Variant: FTL31-AA4M2BAWDJ indicates Hastelloy C22 forks with PTFE coating, 1" fork length, and a specific process connection and cable/connector outlet.
Process Connection: Various options (specified by ordering code).
Output: SPDT relay or solid-state PNP.
Pressure Rating: Up to 1450 psi (100 bar).
Temperature Range: -40 to +266 °F (-40 to +130 °C).
Supply Voltage: 20-253 V AC/DC or 20-72 V DC (model dependent).
Approvals: Typically includes CE, SIL 2 according to IEC 61508, and options for ATEX/IECEx.
Typical Applications
Overfill & Dry-Run Protection: In tanks, vessels, and storage containers.
Pump Control: Automatic start/stop of pumps based on liquid level.
Leak Detection: In catch pans and containment areas.
Chemical Processing: Level monitoring in reactors, separators, and day tanks.
Water & Wastewater: Level control in filtrate tanks, dosing lines, and sumps.
Why Choose Endress+Hauser?
Endress+Hauser is a global leader in level measurement technology. The FTL31 series offers:
Proven Tuning Fork Technology: Millions of units in operation worldwide.
Expert Support: Global network of measurement specialists.
Long-Term Stability: Reduced maintenance and total cost of ownership.
Find More Information & Ordering Details
Looking for the exact datasheet, manual, or a quote for the FTL31-AA4M2BAWDJ? Contact your local Endress+Hauser sales center or authorized distributor. For detailed technical drawings, certificates, and the complete product portfolio, visit the official Endress+Hauser website.
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