Magnetostrictive liquid level gauge principle and analysis of advantages and disadvantages

1 Composition and principle of magnetostrictive liquid level gauge 1.1 Composition The magnetostrictive liquid level gauge is a high-precision measuring instrument that can perform continuous liquid level and interface measurement, and provide analog signal output for monitoring and control. It consists of three parts: (A) 360-degree inner magnetic float; (B) sensor (piezomagnetic sensor and magneto-sensing tube); (C) plastic-encapsulated fully intelligent electronic device. It can be programmed intelligently, with liquid crystal display, which can display the overall liquid level, the interface liquid level, and the electrical signal of the temperature output, the actual liquid level value, the temperature value, the actual liquid level value with offset, etc. 1.2 Working principle A magnetostrictive wire is installed in a non-magnetic sensing tube, and a piezomagnetic sensor is installed at one end of the magnetostrictive wire. The piezomagnetic sensor sends 10 current pulse signals to the magnetostrictive wire every second. Timing, the current pulse interacts with the magnetic field of the magnetic float to generate a torsional stress wave on the magnetostrictive wire, which is transmitted from the position of the float to both ends along the magnetostrictive wire at a known speed. Until the piezomagnetic sensor receives the torsional stress signal, the piezomagnetic sensor can measure the time interval between the initial pulse and the return torsional stress wave, and judge the position of the float according to the size of the time interval. Since the float is always suspended on the liquid surface , and the position of the magnetic float changes with the change of the liquid level, that is, the size of the time interval is the height of the liquid level, and then the signal of the size of the time interval is converted into a 4-20 m proportional to the measured liquid level through a fully intelligent electronic device. A signal (HART) is output. 2 Features 2.1 Advantages (1) Simple structure, consisting of only three parts; (2) High precision, 0.01% of full scale, and the maximum error does not exceed 1.27mm; (3) The calibration is extremely simple, no real standard, just press the button Or use the HART protocol; (4) For re-calibration or forgetting the calibration value, there is no need to re-calibrate; (5) The measurement range is large, 0 ~ 22m; (6) The overall liquid level and interface liquid level can be measured simultaneously, as well as temperature output; (7) The pressure range is large, the maximum is 207Bar, and the standard is 66Bar; (8) The temperature range is large, from -196℃ to 427℃; (9) Differential pressure type, capacitive type, ultrasonic type, radar type, external float can be replaced on site type, steel belt or servo motor type and other liquid level transmitters. 2.2 Disadvantages (1) It cannot measure high-viscosity liquids and slurries. The antenna is immersed in the measured liquid or its saturated vapor and is not suitable for the measurement of pressured, self-aggregating, corrosive, toxic, and high-viscosity liquids. (2) The float moves up and down along the protective tube outside the waveguide, and sometimes gets stuck. 3 Example analysis and comparison 3.1 Differential pressure transmitter and magnetostrictive liquid level meter measurement interface analysis and comparison Figures 1 and 2 are schematic diagrams of a typical compound reactor liquid level measurement in a chemical plant. Above is the oil (benzene and its compounds) and below is the liquid catalyst. Since the catalyst is denser than oil, the two materials are automatically separated. The process operator ensures the rate of formation of the compounding reaction by controlling the catalyst, oil interface (LT1 measurement) and oil level (LT2 measurement). The two liquid level values ​​must be precisely controlled within a certain range, which is the system stop interlock point.
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