The new Liquiphant FTL51 - digital, simple and safe

The new Liquiphant FTL51 with bluetooth module ©Endress+Hauser

The new Liquiphant FTL51 with Bluetooth® Technology

Preventive maintenance is possible with corrosion detection via Heartbeat Technology

Liquiphant with permanent function check is the safe choice for point level detection in liquids

Liquiphant FTL51B with LED mdoule ©Endress+Hauser

The new Liquiphant FTL51 with LED module

Liquiphant FTL51B with LED mdoule ©Endress+Hauser
Liquiphant FTL51B variants ©Endress+Hauser

A large selection of product variants for different applications is available

Liquiphant FTL51B with bluetooth module ©Endress+Hauser

IIoT ready point level switch for all liquid media

The new Liquiphant FTL51 is specialized for the process industry and already developed according to IEC 61508 to be used directly in SIL2 and SIL3 applications without big efforts. You conduct periodic proof tests according to SIL or WHG simply mobile with an intuitive wizard. At the end you receive an automated documentation.
Liquiphant measures reliably and is not affected by changing media properties, flow, turbulences, gas bubbles, foam, vibrations or build-up.

  • Benefits

    • Diagnostics: Permanent diagnostics increase the safety of the plant. You connect your device via the SmartBlue App and you easily have real-time diagnostics at hand 

    • Verification: The device can be verified without process interruption. You get...

  • Field of application

    Point level switch with extension tube for all liquids.

    • Process connections: Threads, flanges and hygienic process connection (Tri-Clamp)

    • Temperature: -50 to +150°C (-58 to +302°F)

    • Pressure: -1 to +100bar (-14.5 to +1450psi)

    • Sensor material: 316L, Alloy

    • ...

Features and specifications



  • Measuring principle

    Vibration Density

  • Measuring principle

    Vibration Liquids

  • Characteristic / Application

    Compact vibronic device with an optional pipe extension up to 6 m;

    Modular housing concept;

    Wide range of certificates

  • Specialities

    Heartbeat Technology,

    Bluetooth® Operation and maintenance SmartBlue App,

    SIL 2/3 according to IEC 61508,

    LED Module,

    RFID TAG for easy identification,

    Second line of defense,

    Ambient temperature down to -50°C (-60°C optional),

    Temperature spacer for high process temperature,

    Plug and play functionalities

  • Supply / Communication

    19...253V AC / 2-wire

    10...55V / DC-PNP 3-wire

    9...20V DC / relays

    19...253V AC or 19...55V DC / relays



  • Ambient temperature

    -60 °C...+70 °C

    (-51 °F...+158 °F)

  • Process temperature

    -50 °C...+150 °C

    (-58 °F...+302 °F)

  • Process pressure absolute / max. overpressure limit

    Vacuum...100 bar

    Vacuum...1450 psi

  • Min. density of medium

    0.5 g/cm³

    (0.4 g/cm³ optional)

  • Main wetted parts



  • Process connection


    G3/4A, G1A, R3/4", R1, NPT3/4, NPT1



    ASME 1"...4"

    JIS 25A...100A

  • Process connection hygienic

    Tri-Clamp ISO2852

  • Sensor length

    Up to 6 m

  • Communication

    2-wire direct load

    DC-PNP 3-wire




    Bluetooth® wireless technology

  • Certificates / Approvals

    ATEX, IEC Ex

  • Safety approvals

    Overfill prevention WHG


  • Design approvals

    EN 10204-3.1

    NACE MR0175, MR0103

    ASME B31.3


  • Options

    Heavy duty stainless steel housing

  • Components

    FTL325P/FTL375P Interface PFM

    FTL325N Interface NAMUR

Documents / Manuals / Software

Accessories / Spare parts

Order code
  • 30
    • Nr 30 Order code 71432518

      Electronics FEL61, 19-253VAC

      2-wire incl. test button. Usage: FTL51B.

    • Nr 30 Order code 71432519

      Electronics FEL62, PNP10-55VDC

      3-wire incl. test button. Usage: FTL51B.

    • Nr 30 Order code 71432549

      Electronics FEL64 DC, relay DPDT

      9-20VDC, contact 253V/6A incl. test button. Usage: FTL51B.

    • Nr 30 Order code 71432570

      Electronics FEL64, relay DPDT

      19-253VAC/19-55VDC, contact 253V/6A incl. test button. Usage: FTL51B.

    • Nr 30 Order code 71432573

      Electronics FEL67 PFM

      2-wire PFM incl. test button. Usage: FTL51B.

    • Nr 30 Order code 71432575

      Electronics FEL68 NAMUR

      2-wire, NAMUR H-L signal incl. test button. Usage: FTL51B.

    • Nr 30 Order code 71432577

      Electronics FEL60D,density/concentration

      Usage: FTL51B.

  • 40
    • Nr 40 Order code 71437381

      Bluetooth module VU121 with battery

      Usage: FEL68 NAMUR output, FTL51B.

    • Nr 40 Order code 71437383

      Bluetooth module VU121 w/o battery

      Excl. battery. Usage: FTL51B.