Hygienic level switch for liquids - Liquiphant FTL33

Hygienic level switch for liquids

Liquiphant FTL33

from ₩286,560
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    • 3-A and EHEDG certificates

    • Robust stainless steel housing, optionally available with M12x1 connector with IP69 protection

    • External function test with test magnet

    Specs at a glance

    Function Point level switch
    Product Liquids
    Mounting Vessels and pipes from DN50
    Product density >0.7 g/cm³ (opt. >0.5 g/cm³)
    Product temperature –40 to +100 °C/+150 °C (–40 to +212 °F /+302 °F)
    Viscosity to 10 000 mm2/s (cSt)
    Process pressure Max. 40 bar (580 psi)

    Liquiphant FTL33

    Product / VersionPrice / pcs. in KRWOrder code
    Electrical ConnectionPower Supply; OutputProcess Connection1 to 34 to 1011+
    M12 / ISO4400 M16 / NPT1/2; IP6510-30VDC; 3-wire PNP1/2 / 3/4 ASME / ISO318,400302,480286,560 FTL33-AA4x3ABxxx
    Thread ASME MNPT1, 316L333,000316,350299,700 FTL33-AA4x3ABVCJ
    Thread ISO228 G1, 316L, install > accessory weld-in adapter336,000319,200302,400 FTL33-AA4x3ABWSJ
    Tri-Clamp / DIN11851390,700371,165351,630 FTL33-AA4x3ABxxx
    Plug M12, IP66/68/69 NEMA Type 4X/6P Encl.10-30VDC; 3-wire PNP1/2 / 3/4 ASME / ISO353,600335,920318,240 FTL33-AA4N3ABxxx
    Thread ASME MNPT1, 316L368,200349,790331,380 FTL33-AA4N3ABVCJ
    Thread ISO228 G1, 316L, install > accessory weld-in adapter371,200352,640334,080 FTL33-AA4N3ABWSJ
    Tri-Clamp / DIN11851425,900404,605383,310 FTL33-AA4N3ABxxx
    ISO4400 M16 / NPT 1/2; IP6520-253VAC/DC; 2-wire / 10-30VDC; 3-wire PNP1/2 / 3/4 ASME / ISO318,400302,480286,560 FTL33-AAxx3ABxxx
    Thread ASME MNPT1, 316L333,000316,350299,700 FTL33-AAxx3ABVCJ
    Thread ISO228 G1, 316L, install > accessory weld-in adapter336,000319,200302,400 FTL33-AAxx3ABWSJ
    Tri-Clamp / DIN11851390,700371,165351,630 FTL33-AAxx3ABxxx


    Product / VersionPrice / pcs. in KRWOrder code
    Weld-in adapter G1, d=60, 316L52,200 52001051
    Weld-in adapter G1, d=53, 316L100,700 71258358
    Cable 4x0.34, box M12, 316L,LED,90o,L=5m29,700 52018763
    Test magnet18,500 71267011

    Prices valid until 31.03.2019 in EUR per unit (not including shipping and applicable sales tax). See
    Endress+Hauser Terms and Conditions

    Is this Liquiphant level switch not the perfect match for your application?

  • Application

    The Liquiphant FTL33 is a point level switch for universal use in all liquids. It is used preferably in storage tanks, mixing vessels and pipes, where the internal and external hygiene requirements are particularly stringent. The reliable switching function works independently from product characteristics such as conductivity and dielectric constant value.


    A piezoelectric drive causes the tuning fork of the Liquiphant FTL33 to vibrate at its resonance frequency. When the tuning fork is immersed in a liquid, its intrinsic frequency changes due to the change in density of the surrounding medium. The electronics system in the point level switch monitors the resonance frequency and indicates whether the tuning fork is vibrating in air or is covered by liquid. A signal is output via the DC-PNP or AC/DC electrical connection.

    Application Example

    Hygienic level switch for liquids Liquiphant FTL33 - Installation

    The point level switch can be installed in any position in a vessel, pipe or tank, e.g., as overfill prevention or upper level detection (1), lower level detection (2) or dry running protection for pump (3)

  • Technical Data

    DC-PNP version
    Supply voltage 10 to 30 V DC, 3-wire
    Switching capacity 200 mA
    Current consumption <15 mA
    Electrical connection M12 connector, valve plug, cable
    AC/DC version
    Supply voltage 20 to 253 V AC/DC, 2-wire
    Switching capacity 250 mA
    Current consumption <3.8 mA (in cut-off torque <1 mA for 100 ms)
    Electrical connection Valve plug, cable
    Output general
    Switching delay

    0.5 s when tuning fork is covered

    1.0 s when tuning fork is uncovered

    Hysteresis max. 3 mm
    Process connections

    Thread ISO 228 G½";

    Thread ISO 228 G¾" and G1" for flushmounted installation in weld-in adapter;

    Thread ASME MNPT ½"; ¾"; 1";

    Thread M24×1,5 for flush-mounted installation in weld-in adapter or process adapter;

    DIN11851 DN25 PN40 (dairy pipe);

    DIN11851 DN32 PN40 (dairy pipe);

    DIN11851 DN40 PN40 (dairy pipe);

    Tri-Clamp ISO2852 DN25-38 (1...1½");

    Tri-Clamp ISO2852 DN40-51 (2");

    Flush-mounting in weld-in adapter RD52, tuning fork can be aligned

    Operating conditions
    Orientation As required
    Switch point

    Vertical orientation: 13 mm (0.5)

    horizontal orientation: 10.5 mm (0.4)

    (water +25 °C (+77 °F), 1 bar (14.5 psi)

    Pipe extension Length depending on the selected process connection
    Surface roughness

    Metallic surface in contact with process:

    Ra ≤1.5 μm (59 μin), EHEDG Ra ≤0.76 μm (30 μin), EHEDG, 3-A

    Ambient temperature –40 to +70 °C (–40 to +158 °F)
    Process temperature

    –40 to +100 °C (–40 to +212 °F),

    optionally to +150 °C (to +302 °F)

    Process pressure –1 to +40 bar (–14.5 to +580 psi)
    Storage temperature –40 to +85 °C (–40 to +185 °F)
    Climate class DIN EN 60068-2-38/IEC 68-2-38: test Z/AD
    Density > 0.7 g/cm³ (optionally: > 0.5 g/cm³)
    Viscosity 1...10 000 mPa·s, dynamic viscosity
    Degree of protection

    IIP65/67 NEMA Type 4X Enclosure (M12 connector);

    IP66/68/69K NEMA Type 4X/6P Enclosure (M12 connector for metal housing cover);

    IP65 NEMA Type 4X Enclosure (valve plug);

    IP66/68 NEMA Type 4X/6P Enclosure (cable)

    Electromagnetic compatibility Electromagnetic compatibility in accordance with all relevant requirements of the EN 61326 series and NAMUR recommendation EMC (NE21). For details, refer to the EC Declaration of Conformity
    WHG approval Overfill detection system: Z-65.11-531 Leak detection system: Z-65.40-532
    3-A, EHEDG  depending on selected product configuration
    EAC mark  
    RCM-Tick marking  

    Dimensions in mm (inches)

    Hygienic level switch for liquids Liquiphant FTL33 - Dimensions

    A) Thread ISO 228 G ¾" for flush-mounted installation in weld-in adapter

    B) Thread ISO 228 G 1" for flush-mounted installation in weld-in adapter

    C) DIN11851 DN25; DN32; DN40

    D)Tri-Clamp ISO2852 DN25-38; DN40-51

    E) Flush-mounting in weld-in adapter RD52


    * Dimension for process temperature up to 100 °C (212 °F)

    ** Dimension for process temperature up to 150 °C (302 °F)

    Installation according to instruction manual

    Electrical connection

    Electronic version 3-wire DC PNP

    Hygienic level switch for liquids Liquiphant FTL33 - Wiring the 3-wire version

    A) M12 connector

    B) Valve plug

    C) Cable

    Electronic version 2-wire AC/DC

    Hygienic level switch for liquids Liquiphant FTL33 - Wiring the 2 wire version

    A) Valve plug

    B) Cable

  • More documents for FTL33
  • Previous model: FTL20H

    Price / pcs. in KRW
    Liquiphant T FTL20H1 to 34 to 1011+Liquiphant FTL33
    FTL20H-0GDJ1B318,400302,480286,560 FTL33-AA1U3ABW5J
    FTL20H-0GDJ2B318,400302,480286,560 FTL33-AA4U3ABW5J
    FTL20H-0GDJ2D318,400302,480286,560 FTL33-AA4M3ABW5J
    FTL20H-0GDJ2F353,600335,920318,240 FTL33-AA4N3ABW5J
    FTL20H-0GEJ1B336,000319,200302,400 FTL33-AA1U3ABWSJ
    FTL20H-0GEJ2B336,000319,200302,400 FTL33-AA4U3ABWSJ
    FTL20H-0GEJ2D336,000319,200302,400 FTL33-AA4M3ABWSJ
    FTL20H-0GEJ2F371,200352,640334,080 FTL33-AA4N3ABWSJ
    FTL20H-0TCJ1B390,700371,165351,630 FTL33-AA1U3AB3CJ
    FTL20H-0TCJ2B390,700371,165351,630 FTL33-AA4U3AB3CJ
    FTL20H-0TCJ2D390,700371,165351,630 FTL33-AA4M3AB3CJ
    FTL20H-0TCJ2F425,900404,605383,310 FTL33-AA4N3AB3CJ
    FTL20H-0TDJ1B390,700371,165351,630 FTL33-AA1U3AB3EJ
    FTL20H-0TDJ2B390,700371,165351,630 FTL33-AA4U3AB3EJ
    FTL20H-0TDJ2D390,700371,165351,630 FTL33-AA4M3AB3EJ
    FTL20H-0TDJ2F425,900404,605383,310 FTL33-AA4N3AB3EJ
    FTL20H-0UPJ2B390,700371,165351,630 FTL33-AA4U3AB5ZJ
    FTL20H-0UPJ2D390,700371,165351,630 FTL33-AA4M3AB5ZJ
    FTL20H-0UPJ2F425,900404,605383,310 FTL33-AA4N3AB5ZJ