E+H Liquiphant FTL81 Vibronic Point Level Switch

Liquiphant FTL81 is a point level switch for use in hazardous areas with all international certificates. FailSafe overfill prevention in applications with functional safety up to SIL3 with one device. Reliable measurement values, not affected by: changing media properties, flow, turbulences, gas bubbles, foam, vibrations or build-up.

  • Use in safety systems requiring functional safety to SIL3 in accordance with IEC 61508 Ed.2.0/ IEC 61511-1/ISA 84-1 and DIN EN ISO 13849
  • Proof test: proof testing interval up to 12 years, Slave devices tested at the press of a button
  • Permanent self-monitoring/internal redundancy
  • 4-20mA interface (acc. to NAMUR NE 06/NE 43): easy integration via the switching unit (Nivotester FailSafe FTL825) with a two-channel output (safety contacts) and locking function or direct integration into a safety PLC
  • No adjustment: quick, low-cost startup
  • No mechanically moving parts: no maintenance, no wear, long operating life
  • Monitoring of fork for damage, corrosion, build-up and mechanical blocking

Point level switch for liquids up to SIL3.

  • Process connections: Threads and flanges
  • Temperature: -60 to +280°C (-76 to +540°F)
  • Pressure: -1 to +100bar (-14.5 to +1,450psi)
  • Sensor length: Extension pipe up to 3m (9.8ft)
  • Sensor material: 316L, Alloy C
  • International explosion protection certificates, overfill prevention WHG, SIL, marine approvals
  • Measuring principle

    Vibration Liquids

  • Characteristic / Application

    Reliable point level switch with extension pipe for MIN and MAX safety applications up to SIL3.
    Dual Sealing / Second line of defense

    Modular housing concept

  • Specialities

    Outstanding features: 
    – permanent LIVE signal 
    monitors function safety

    – failsafe design and

    – high availability of the measuring values

  • Supply / Communication

    2-wire 4…20 mA

  • Ambient temperature


  • Process temperature


  • Process pressure absolute / max. overpressure limit

    Vacuum…100 bar
    (1450 psi)

  • Min. density of medium

    Density from 0.4 g/cm3
    (0.4 SGU)

  • Main wetted parts


    Alloy C

  • Process connection



    ASME 1″…4″,

    JIS 10K…20K


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

  • Sensor length

    Extension pipe up to 3 m (9.8 ft)

  • Communication

    2-wire 4…20 mA

  • Certificates / Approvals


  • Safety approvals

    Overfill prevention WHG

    Leakage Detection


  • Design approvals

    EN 10204-3.1

    NACE MR0175, MR0103

    ASME B31.3


  • Marine approval

    GL/ ABS/ LR/ BV/ DNV

  • Options

    PWIS free

    Pressure tight feed through

    Weather protection

  • Components

    Nivotester FTL825, Transmitter

Datasheet: Weld-in adapter, process adapter and flanges

Liquiphant FailSafe FTL80, FTL81, FTL85 Technical Information


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