WIKA FFG 高分辨率磁致伸缩液位水平传感器

可防爆 法兰连接

Level Sensors Magnetostrictive, high-resolution measuring principle
Model FFG

   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

   Special Features
    ■ Process and system-specific solutions possible
    ■ Operating limits:
       - Operating temperature: T = -200 ... +200 °C
       - Working pressure: P = Vacuum to 100 bar
       - Limit S. G.: ρ ≥ 400 kg/m3
    ■ Wide variety of different electrical connections, process connections and materials
    ■ Explosion-protected versions

   Debion
    The WIKA Model FFG sensor acts as a measured value transmitter for high-accuracy, continuous level measurement of liquids and is based on identifying the b of a magnetic float following the magnetostrictive measuring principle.

   Further special features
    ■ Large scope of application due to the simple, proven functional principle
    ■ Process connection, guide tube material and float made of stainless steel 1.4571 or plastic
    ■ For harsh operating conditions, long service life
    ■ Continuous measurement of the liquid levels irrespective of physical or chemical changes of state of the measured media, such as: foaming, conductivity,
dielectric constant, pressure, vacuum, temperature, vapour, condensation, blistering, effects of boiling, density changes
    ■ Signal transmission over large distances
    ■ Simple installation and commissioning, onetime calibration only, no recalibration necessary.
    ■ Volume-proportional or depth-proportional display of the filling level
    ■ Interface layer measurement and overall level from Δ-density 50 kg/m3

   Options
    ■ Customer-specific solutions
    ■ Process connection, guide tube material and float made of stainless steel 1.4435, 1.4539, titanium, Hasbloy (others on request)
    ■ In combination with limit switch, stepless setting of the limit values over the entire measuring range

   Illustration of the principle

   

   Design and operating principle
    ■ The measuring process is initiated by a current impulse.This current generates an axial magnetic field (3) along the length of a wire (1) made of magnetostrictive material,which is held under tension inside the guide tube.
    ■ At the point being measured (liquid level) is a float with permanent magnets (4) acting as a b transducer.
    ■ The interb of both magnetic fields generates a mechanical torsion wave (5) in the wire.
    ■ This is converted into an electrical signal by a piezoceramic transber in the sensor housing (2) at the end of the wire.
    ■ The measured propagation delay enables the origination point, and thus the float b, to be determined with high accuracy.

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