Working Principle of Magnetostrictive Linear Displacement Sensor

Magnetostrictive Linear Displacement Sensor

Magnetostrictive linear displacement (liquid level) transmitter (magnetic ruler for short) is a displacement transmitter with high precision and long stroke absolute position measurement manufactured by magnetostrictive principle. It can not only measure the linear displacement of moving objects, but also give the position and speed analog signal or liquid level signal of moving objects. According to the different output signals, it is divided into analog and digital types. Flexible power supply mode and extremely convenient multiple wiring methods and multiple output forms can meet various measurement, control and detection requirements; due to the non-contact measurement method, friction or wear caused by mutual contact of components is avoided, so it is very suitable for system engineering or occasions with harsh environment and no regular maintenance. Not only the performance of the sensor is excellent, but more importantly, it has a long working life, good environmental adaptability, reliability, and can work effectively and stably. Compared with conductive rubber displacement sensors, magnetic grid displacement sensors, resistive displacement sensors and other products, it has obvious advantages. Moreover, it is easy to install and debug, and has a very high performance-price ratio; timely and thoughtful after-sales service is enough to make users use it with more confidence.
Among them, the explosion-proof (flameproof) magnetic scale strictly complies with GB3836.1-83 "General Requirements for Explosion-proof Electrical Equipment for Explosive Environments", and has obtained the explosion-proof certificate issued by the National Explosion-proof Electrical Products Quality Inspection Center. Explosion-proof mark: EXdⅡBT5.

Working Principle of Magnetostrictive Linear Displacement Sensor
     The magnetostrictive linear displacement (liquid level) transmitter is mainly composed of a measuring rod, an electronic compartment and a non-contact magnetic ring (float) mounted on the measuring rod. The measuring rod is equipped with a magnetostrictive wire (waveguide wire). When working, a starting pulse is generated by the electronic circuit in the electronic compartment. When this starting pulse is transmitted in the waveguide wire, a rotating magnetic field that moves along the direction of the waveguide wire is simultaneously generated. When this magnetic field meets the permanent magnetic field in the magnetic ring (float), a magnetostrictive effect is generated, causing the waveguide wire to twist and generate a twisting pulse (or "return" pulse). This twisting pulse is sensed by the energy pickup mechanism installed in the electronic compartment and converted into a corresponding current pulse. The time difference between the start and return of the two pulses is calculated by the electronic circuit, and the position and displacement of the measured object can be accurately measured.III. Main technical performance indicators★ Measuring range (mm) 80 150 300 500 800 1000 1200 1500 2000 2200 2500 2800 3000 3500 4000 4500 5000 (customizable)★ Output form/working voltage (three-wire system)         Displacement signal: 0~5VDC/+24VDC±10%           0~10VDC/+24VDC±10%          (-5~+5)VDC/±15VDC±10%          (-10~+10)VDC/±15VDC±10%           4~20mADC/+24VDC±10%Speed ​​signal: 1V/25.4mm/s (maximum 10VDC) ★ Load capacity The maximum load of voltage signal output is 2mA.                The maximum load of current signal output is 600Ω.★ Non-linear error ±0.05%FS; the maximum error below 300mm is 150 μm.★ Repeatability error Better than 0.002%FS.★ Resolution Better than 0.002%FS.★ Hysteresis Better than 0.002%FS. ★ Temperature influence Better than 0.007%/FS/℃.★ Storage temperature -40～+100℃. ★ Working temperature 0～+70℃. -25～+80℃. -40～+85℃.★ Full scale adjustment range 20%FS.★ Zero adjustment range 20%FS.★ Ripple Less than 2mVrms in low noise environment                   Less than 6mVrms                   in servo working state (80～1600mm) Less than 10mVrms in servo working state (1600～300mm)★ Probe rod material 0Cr18Ni9（304）                   316 stainless steel (special customization)★ Electronic compartment shell material 1Cr18Ni9Ti★ Leading method PVC shielded cable (default length: 2.8m, can also be provided according to user requirements)                   Aviation plug (not suitable for explosion-proof products)                   Terminal block★ Explosion-proof mark EXdⅡBT5★ Shell protection grade IP65