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Vibronic Point level detection Liquiphant FTL31

Point level switch for liquids in compact design with stainless steel housing

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Vibronic Point level detection Liquiphant FTL31

Point level switch for liquids in compact design with stainless steel housing

This product is stocked in various preconfigured variants that usually ship within just 2 working days.
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Benefits

  • Designed according to highest requirements to quality and environmental sustainability. The self-monitoring Liquiphant offers safe switching also in case of power supply loss.
  • Independent of changing media properties an accurate switching point is offered. IO-Link reduces costs and complexity due to easy configuration of the devices via engineering tools
  • A real plug & play sensor is offered without any need for adjustment even with changing media. Measurement is unaffected by conductivity, build-up, turbulence, flows or air bubbles
  • No calibration is required, no specific know-how or tools (e.g. software) necessary
  • Robust design made of stainless steel (316L) assures highest durability
  • A modular design offers different process temperatures and the widest variety of process connections and accessories in the market to fit every application
  • No mechanically moved parts, free of maintenance

Integrated technologies

IO-Link digital communication technology
FLEXible answers to individual needs
Current product

Vibronic Point level detection Liquiphant FTL31

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  • Easy to select, install and operate

What is FLEX?

FLEX selections
Technical excellence
Simplicity
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Fundamental selection Meet your basic measurement needs
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Lean selection Handle your core processes easily
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Extended selection Optimize your processes with innovative technologies
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Xpert selection Master your most challenging applications
Variable
5-year warranty

Engineered for Confidence

Our Fundamental Selection instruments feature an extended 5-year warranty – a clear testament of our trust in their long-term reliability and performance.

Should a warranty case occur, you can count on a fast replacement process and minimal administrative effort – giving you peace of mind when it matters most and helping you keep your operations running smoothly.

Warranty terms apply

The extended warranty is subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

Services by your side

Right‑first‑time commissioning, worldwide

Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

Remote support you can trust wherever you operate

With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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Check prices and delivery times, save your favorite products, create quotes and place orders in just a few clicks and track deliveries at any time. With access to your complete order and quote history including all relevant documents you benefit from full transparency throughout the entire process.

Easy access to technical documentation

Select and download all technical documentation such as operating manuals, calibration certificates, approvals and CAD drawings conveniently bundled as a complete documentation package for your entire order or quote.

My Endress+Hauser – all in one place

My Endress+Hauser is your 24/7 connection to Endress+Hauser – in the office, in the field or on the go. It brings together transaction management, documentation and software downloads, knowledge base access, customer support, engineering tools and cloud‑based IIoT services helping you work easier, faster and more efficiently.

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Technology
IO-Link digital communication technology

IO-Link communication

IO-Link makes basic field devices digitally accessible and supports offline parameterization, data transparency and plug-and-produce device exchange.

Product information

Liquiphant FTL31 - Vibronic point level detection
Vibronic - Liquiphant FTL31
Specifications
Measuring / Application task Point Level / Liquids
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Description

Liquiphant FTL31 is a point level switch for liquids. The FTL31 is designed for industrial applications in all industries, mainly the machinery industry. The Liquiphant is used for overfill protection or pump dry-run protection in cleaning systems. The IO-Link capability allows easy parameter setting. Compact: - Smallest vibronic sensor in the market Safe: - Continuous self-monitoring -Reliable switching independent of media properties Easy: - No calibration - Plug & play - IO-Link connectivity

Field of application

Point level switch in compact design with stainless steel housing.

  • Process connections: Threads
  • Temperature: -40 to +150°C (-40 to +302°F)
  • Pressure: -1 to +40bar (-14.5 to 580psi)
  • Surface roughness: 3.2µm
  • Overfill protection and leakage detection WHG, marine approvals, final inspection report
Benefits
  • Designed according to highest requirements to quality and environmental sustainability. The self-monitoring Liquiphant offers safe switching also in case of power supply loss.
  • Independent of changing media properties an accurate switching point is offered. IO-Link reduces costs and complexity due to easy configuration of the devices via engineering tools
  • A real plug & play sensor is offered without any need for adjustment even with changing media. Measurement is unaffected by conductivity, build-up, turbulence, flows or air bubbles
  • No calibration is required, no specific know-how or tools (e.g. software) necessary
  • Robust design made of stainless steel (316L) assures highest durability
  • A modular design offers different process temperatures and the widest variety of process connections and accessories in the market to fit every application
  • No mechanically moved parts, free of maintenance
Predecessors
Downloads
Most downloaded
Technical Information (TI)
Liquiphant FTL31 Vibronic
English version - 07/2022
Download
Operating Instruction (BA)
Liquiphant FTL31 Point level switch for liquids
English version - 07/2022
Download
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
The CAD Drawings will be available after the configuration.
All downloads
62 Downloads
Technical Information (TI)
TI Weld-in adapter, process adapter and flanges Level, pressure, temperature
English version - 06/2026
Download
Technical Information (TI)
Most downloaded
Liquiphant FTL31 Vibronic
English version - 07/2022
Download
Technical Information (TI)
Liquiphant FTL31 IO-Link Point level switch for liquids
English version - 01/2021
Download
Operating Instruction (BA)
Liquiphant FTL31 IO-Link Point level switch for liquids
English version - 10/2020
Download
Operating Instruction (BA)
Most downloaded
Liquiphant FTL31 Point level switch for liquids
English version - 07/2022
Download
Short Instruction (KA)
KA Liquiphant FTL31 Level switch for liquids
English version - 08/2024
Download
Short Instruction (KA)
KA Liquiphant FTL31 Level switch for liquids
IO-Link
English version - 08/2024
Download
ZE (Certificate)
Liquiphant FTL31, FTL33 Allgemeine bauaufsichtliche Zulassung /
Allgemeine Bauartzulassung Z-65.40-532 (DIBt) für Liquiphant
Leckage
German version - 07/2019
Download
ZE (Certificate)
Liquiphant FTL31, FTL33 Allgemeine bauaufsichtliche Zulassung /
Allgemeine Bauartzulassung Z-65.11-531 (DIBt) für Liquiphant
German version - 07/2019
Download
Special Documentation (SD)
Valve plug Valve plug
English version - 03/2016
Download
Special Documentation (SD)
SD M12 socket Accessories for devices with M12 plug
English version - 01/2025
Download
Special Documentation (SD)
SD Endress+Hauser IO-Link devices Endress+Hauser IO-Link device function blocks
For Siemens TIA Portal
English version - 07/2026
Download
Special Documentation (SD)
Mounting hints for weld-in adapter Level and pressure measurement Special Documentation Mounting hints for weld-in adapter
English version - 04/2018
Download
Special Documentation (SD)
SD Endress+Hauser IO-Link devices Endress+Hauser IO-Link Add-On Instructions
for Rockwell Automation Studio 5000®
English version - 07/2026
Download
Fields of Activities (FA)
Misura di livello Misura di livello
Panoramica dei prodotti per
applicazioni in liquidi e solidi sfusi
Italian version - 06/2026
Download
Fields of Activities (FA)
Catálogo Medición y Detección de nivel Gama de productos para aplicaciones con líquidos y sólidos
Spanish version - 06/2022
Download
Fields of Activities (FA)
レベル計 総合カタログ 液体および粉体アプリケーション向けレベル計・レベルスイッチ
Japanese version - 12/2025
Download
Fields of Activities (FA)
Misura di livello Misura di livello
Panoramica dei prodotti per applicazioni in liquidi e solidi sfusi
Italian version - 03/2023
Download
Fields of Activities (FA)
Füllstandsmesstechnik Produktübersicht für Anwendungen in Flüssigkeiten und Schüttgütern
German version - 10/2022
Download
Fields of Activities (FA)
Level measurement Product overview for applications in liquids and bulk solids
English version - 03/2026
Download
Competence Brochure (CP)
レベルスイッチ(液体および粉体用) 選定およびエンジニアリングガイド
Japanese version - 07/2026
Download
Competence Brochure (CP)
Point level detection in liquids and bulk solids Selection and engineering guide
English version - 02/2025
Download
Competence Brochure (CP)
Grenzstanddetektion in Flüssigkeiten und Schüttgütern Auswahl- und Projektierungshilfe
German version - 02/2025
Download
Competence Brochure (CP)
Catálogo soluciones esenciales Alta calidad a precios competitivos
Spanish version - 01/2017
Download

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Vibronic Point level detection Liquiphant FTL31
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Spare parts and accessories

further parts
further parts

Valve Plug ISO4400 M16, 4-pole

further parts
further parts
Order code 71280307
further parts
further parts

Valve plug ISO4400 NPTF1/2, 4-pole

further parts
further parts
Order code 71280349
further parts
further parts

Valve plug ISO4400 QUICKON, 4-pole

further parts
further parts
Order code 71280350
further parts
further parts

Pressure ring f.weld-in adapt.G3/4" 316L

further parts
further parts
Order code 52027421
Spare parts and accessories
Liquiphant FTL31 - Vibronic point level detection
Vibronic - Liquiphant FTL31

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Spare parts and accessories

further parts
further parts

Valve Plug ISO4400 M16, 4-pole

further parts
further parts
Order code 71280307
further parts
further parts

Valve plug ISO4400 NPTF1/2, 4-pole

further parts
further parts
Order code 71280349
further parts
further parts

Valve plug ISO4400 QUICKON, 4-pole

further parts
further parts
Order code 71280350
further parts
further parts

Pressure ring f.weld-in adapt.G3/4" 316L

further parts
further parts
Order code 52027421
Spare parts and accessories