E+H Liquiphant FTL31 Vibronic Level Switch

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 prevention or pump dry-run protection in cleaning systems. The IO-Link capability allows easy parameter setting.
– Smallest vibronic sensor in the market
– Continuous self-monitoring
-Reliable switching independent of media properties
– No calibration 
– Plug & play
– IO-Link connectivity

  • 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

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 prevention and leakage detection WHG, marine approvals, final inspection report
  • Measuring principle

    Vibration Liquids

  • Characteristic / Application

    Level switch for liquids and is used in tanks, vessels 
    and pipes.

  • Supply / Communication

    20 … 253V AC/DC, 2-wire
    10 … 30V DC-PNP 3-wire

  • Ambient temperature

    -40 °C … 70 °C
    (-40 °F … 158 °F)

  • Process temperature

    -40 °C … 150 °C
    (-40 °F … 302 °F)

  • Process pressure absolute / max. overpressure limit

    Vacuum … 40 bar
    (Vacuum … 580 psi)

  • Min. density of medium

    (>0,5g/cm³ optional)

  • Main wetted parts


  • Process connection


    G1/2, G3/4, G1, MNPT1/2, MNPT3/4, MNPT1, R1/2, R3/4, R1

  • Communication


  • Certificates / Approvals


  • Safety approvals

    Overfill prevention WHG


  • Design approvals

    EN 10204-3.1

  • Marine approval

    ABS/ LR/ BV/ DNV

  • Options

    Adjustment switching delay

    Cleaned from oil+grease,

    PWIS free

Datasheet: Liquiphant FTL31 IO-Link Technical Information

Liquiphant FTL31 Technical Information

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