TC Fluid Control Magnetostrictive Level Sensor

TC Fluid Control Magnetostrictive 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 Applications

  • 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

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TC Fluid Control Magnetostrictive Options

  • 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 model Description Materials Temperature range
Stainless steel Stainless steel Titanium 1.4571 (316Ti)    1.4404 (316L)     3.7035 Stainless steel PP 1.4435 (316L) PVDF (process)
(grade 2)
FLM-S Magnetostrictive sensor, standard x x x -60 … +185 °C
FLM-ST Magnetostrictive sensor, x x x -90 … +400 °C
high temperature
FLM-SP Magnetostrictive sensor, x x -10 … +100 °C
FLM-H Magnetostrictive sensor, x x -40 … +400 °C
sterile version
Sensor model Approval
without    Ex i Ex d NEPSI NEPSI 3A
Ex d nL
FLM-S x x x x x
FLM-H x x

Ex approvals

Explosion Ignition protection Model Zone Approval number protection  Type
ATEX Ex i FLM-ST-Ex i Zone 0 IBExU 02 ATEX 1124 X II 1/2G Ex ia IIC T3 … T6
Ex i FLM-S-Ex i Zone 0 ZELM 10 ATEX 0439 II 1/2G Ex ia IIC T3 … T6
Ex d FLM-S-Ex d Zone 1 ZELM 13 ATEX 0508 X II 1/2G Ex d IIB T3 to T6 Ga Gb
NEPSI Ex d FLM-S-Ex d Zone 1 GYJ101053 Ex d II CT3-T6
NEPSI nL FLM-S-Ex i Zone 1

Type approval

Explosion protection Model Approval number
GOST FLM-S 0959333
3A FLM-H 3-A Sanitary Standards 74-06

Download Datasheet: TC Fluid Control Magnetostrictive Level Sensor


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