Endress+Hauser FTL31-AA1U2AAWBJ Vibronic Liquiphant Level Switch

• Extended Product Type: Level Switch

• Product ID: FTL31-AA1U2AAWBJ

• E+H Type Designation: Level Switch

Description of Endress+Hauser FTL31-AA1U2AAWBJ Vibronic Liquiphant Level Switch

The Endress+Hauser FTL31-AA1U2AAWBJ Vibronic Liquiphant is a compact and highly reliable point level switch designed for precise liquid detection in industrial processes. Built with proven vibronic technology, this device ensures accurate level monitoring, overfill protection, and dry-run prevention in tanks, pipelines, and storage vessels.

The Endress+Hauser Liquiphant FTL31 operates using a vibrating tuning fork that changes frequency when immersed in liquid. This simple but highly effective principle allows the sensor to detect liquid presence independent of conductivity, density variations, turbulence, bubbles, foam, or viscosity changes.

Designed for hygienic and industrial environments, the FTL31 features a rugged stainless-steel construction, making it suitable for harsh process conditions while maintaining long-term stability and reliability. Its compact design allows easy installation even in tight spaces or small vessels.

The FTL31-AA1U2AAWBJ model is widely used in industries such as chemical processing, water treatment, food and beverage, pharmaceuticals, and industrial utilities where reliable liquid level detection is critical for process safety and efficiency.

With plug-and-play commissioning, minimal maintenance requirements, and fast response times, this vibronic level switch provides an ideal solution for continuous industrial operation.

Key Features of

E+H FTL31-AA1U2AAWBJ Vibronic Liquiphant Level Switch

• Compact vibronic point level switch for liquids
• Proven tuning fork measurement technology
• Reliable switching independent of liquid properties
• Robust stainless-steel construction for harsh environments
• Fast and accurate liquid detection
• Suitable for overfill protection and dry-run prevention
• Maintenance-free operation with long service life
• Easy installation and commissioning
• Resistant to foam, bubbles, turbulence, and viscosity changes
• High operational reliability in industrial processes

Technical Specifications for E+H FTL31-AA1U2AAWBJ Vibronic Liquiphant 

Parameter	Specification
Manufacturer	Endress+Hauser
Model	FTL31-AA1U2AAWBJ
Product Type	Vibronic Liquid Level Switch
Measurement Principle	Vibrating tuning fork
Application	Point level detection for liquids
Process Connection	Threaded process connection
Process Temperature Range	-40°C to +150°C (depending on configuration)
Process Pressure Range	Up to 40 bar
Output Signal	PNP switching output
Power Supply	10 – 30 V DC
Wetted Parts Material	Stainless Steel
Housing Material	Stainless Steel / Industrial polymer
Response Time	Rapid switching response
Protection Rating	IP65 / IP67 depending on installation
Installation Orientation	Any orientation
Maintenance	Maintenance-free
Certification	Industrial safety and compliance approvals

Applications for

Endress+Hauser FTL31-AA1U2AAWBJ Vibronic Liquiphant Level Switch

The Endress+Hauser FTL31 Vibronic Liquiphant is designed for reliable point level detection across a wide range of industrial sectors. Its robust design and accurate switching make it ideal for both simple and demanding applications.

Tank Overfill Protection

Prevents tanks and vessels from overfilling by triggering alarms or shutdown systems when liquid reaches a predefined level.

Dry-Run Protection for Pumps

Protects pumps and process equipment from damage caused by running without liquid.

Pipeline Monitoring

Detects liquid presence in pipelines to ensure proper process flow and system safety.

Chemical Processing Plants

Ensures safe liquid handling and process monitoring in chemical production environments.

Water and Wastewater Treatment

Provides dependable level monitoring in storage tanks, treatment basins, and pumping stations.

Food and Beverage Processing

Supports hygienic liquid level detection for processing tanks and storage vessels.

Pharmaceutical Manufacturing

Ensures reliable process control in sterile and regulated production environments.

Why Choose the Endress+Hauser FTL31 Liquiphant?

The Endress+Hauser Liquiphant FTL31 is one of the most trusted vibronic level switches in the process instrumentation industry. Its rugged design, fast switching capability, and independence from liquid characteristics make it a highly dependable choice for modern industrial automation systems.

By eliminating moving parts prone to wear and offering vibration-resistant construction, the FTL31 delivers long-term stability with minimal maintenance requirements.

For facilities seeking improved operational safety, process efficiency, and reliable level monitoring, the Liquiphant FTL31 is an ideal solution.

Frequently Asked Questions (FAQ)

What is the Endress+Hauser FTL31 used for?

The Endress+Hauser Liquiphant FTL31 is used for point level detection in liquid applications. It is commonly used for overfill protection, dry-run prevention, and liquid presence detection in tanks and pipelines.

How does the vibronic tuning fork technology work?

The sensor uses a vibrating tuning fork. When the fork comes into contact with liquid, the vibration frequency changes. The device detects this change and triggers a switching output to indicate the presence of liquid.

Can the FTL31 detect liquids with foam or bubbles?

Yes. Vibronic technology is largely unaffected by foam, bubbles, turbulence, conductivity, or viscosity variations, ensuring reliable switching.

What industries commonly use the Liquiphant FTL31?

It is widely used in chemical processing, water treatment, food and beverage production, pharmaceutical manufacturing, and industrial utilities.

Does the FTL31 require calibration?

No. The device is factory calibrated and operates reliably without additional calibration during installation.

Is the Liquiphant FTL31 suitable for harsh environments?

Yes. The stainless-steel construction and sealed housing make it suitable for demanding industrial environments with high vibration, temperature changes, and pressure conditions.