The magnetostrictive level gauge consists of three parts: a probe, a circuit unit and a float. With HART protocol, zero and span can be adjusted remotely. It can also adjust various parameters through the three keys in the chassis and the LCD. The configurable parameters include unit, display upper and lower limits, damping, translation correction, calibration upper and lower limits, digital-analog fine-tuning correction, and factory reset settings.
Magnetostrictive working principle:
The pulse generator gives the copper wire a pulse current of about 10 Hz, which is called the current interrogation pulse. Generates a pulsed magnetic field around the waveguide. This magnetic field interacts with the magnetic field of the magnet and changes the magnetic field distribution. The junction forms a spiral magnetic field. Instantaneous torque on soft magnetic waveguides causes the waveguide to expand and contract. A tension pulse wave was generated on the waveguide and propagated up and down along the waveguide at a fixed speed (approximately 2830 m/s).
As the waveguide propagates upwards and downwards in the tension pulse wave, the expansion and contraction of the waveguide will “carry†the axial component of the spiral magnetic field along the axial direction of the waveguide. The returned tension pulse wave magnetic field will generate an induced voltage pulse on the detection coil, ie Return pulse. The return pulse signal is processed by the detection circuit. The measured fluid level is accurately determined by measuring the time difference between the current interrogation pulse and the return pulse. The tension pulse wave propagating downward in the current direction is damped by the damper to ensure that no reflection occurs at the end of the waveguide. Interference with normal "return pulses". Because measuring the interval between two pulses can be very precise. Therefore, high-precision (general resolution is less than 1mm), low repeatability (general reproducibility is less than or equal to 0.002% of full scale) wide range (up to 30m) and other excellent performance. Such as the permanent magnet carried by a float. The level can be measured. The disadvantage of the sensor is that there is a large blind area. Generally, the breeding area is less than or equal to 80mm, and the lower blind area is less than or equal to 10mm.
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