TC Fluid Control Magnetostrictive Level Sensor

 The model FFG-P, FFG-T, FFG-TP and FLM-H sensors are used for the high-accuracy, continuous level measurement of liquids and are based on determining the position of a magnetic float according to the magnetostrictive measuring principle.

TC Fluid Control Magnetostrictive Level Sensor

TC Fluid Control Magnetostrictive Level Sensor | Features


  • High-accuracy level measurement for almost all liquid media
  • Chemical industry, petrochemical industry, natural gas, offshore, shipbuilding, machine building, power generating equipment, power stations
  • Process water and drinking water treatment, food and beverage industry, pharmaceutical industry


  • Process and system-specific solutions possible
  • Operating limits: Operating temperature: T = -90 ... +400 °C, Working pressure: P = Vacuum to 100 bar, Limit S. G.: ρ ≥ 400 kg/m3
  • Resolution < 0.1 mm
  • Wide variety of different electrical connections, process connections and materials
  • Explosion-protected versions
  • Large scope of application due to the simple, proven functional principle
  • Process connection, guide tube and float from stainless steel 1.4571, 1.4435, 1.4539 or plastic
  • For harsh operating conditions, long service life
  • Continuous measurement of levels, independent of physical and chemical changes of the media such as: Foaming, conductivity, dielectric constant, pressure, vacuum, temperature, vapours, condensation, bubble formation, boiling effects, density change
  • Signal transmission over long distances
  • Simple installation and commissioning, onetime calibration only, no recalibration
  • Level displayed proportional to volume or height
  • Parallel measurement of interface layer and overall level possible via HART® interface


  • Customised solutions
  • Process connection, guide tube material and float from special steel, titanium, Hastelloy (others on request)
  • In combination with limit switch, stepless setting of the limit values over the entire measuring range

Design and operating principle

  • The measuring process is triggered by a current impulse. This current produces a circular magnetic field (3) along a wire (1) made of magnetostrictive material fixed in the guide
  • At the point being measured (liquid level) there is a float with permanent magnets (4) acting as a position
  • The interaction of both magnetic fields generates a mechanical torsion wave (5) in the
  • This is converted into an electrical signal at the end of the wire in the sensor housing (2) by a piezoceramic converter.
  • The measured propagation delay enables the origination point, and thus the float position, to be determined with high

Model Overview

Sensor modelDescription


Stainless steel Stainless steel Titanium 1.4571 (316Ti)    1.4404 (316L)     3.7035

(grade 2)


Stainless steel PP 1.4435 (316L)

Temperature range

PVDF (process)

FLM-SMagnetostrictive sensor, standardxxx   -60 ... +185 °C

Magnetostrictive sensor,

high temperature

xxx   -90 ... +400 °C

Magnetostrictive sensor,


    xx-10 ... +100 °C

Magnetostrictive sensor,

sterile version

 x x  -40 ... +400 °C


Sensor model


without    Ex i


Ex d



Ex d






FLM-Hx    x


Ex approvals

Explosion      Ignition protection   Model                  Zone                  Approval number protection     type
ATEXEx iFLM-ST-Ex iZone 0IBExU 02 ATEX 1124 X II 1/2G Ex ia IIC T3 ... T6
 Ex iFLM-S-Ex iZone 0ZELM 10 ATEX 0439 II 1/2G Ex ia IIC T3 ... T6
 Ex dFLM-S-Ex dZone 1ZELM 13 ATEX 0508 X II 1/2G Ex d IIB T3 to T6 Ga Gb
 NEPSI Ex dFLM-S-Ex dZone 1GYJ101053 Ex d II CT3-T6
 NEPSI nLFLM-S-Ex iZone 1-

Type approval

Explosion protectionModelApproval number
3AFLM-H3-A Sanitary Standards 74-06


Download Datasheet : TC Fluid Control Magnetostrictive Level Sensor