About the application of the newly designed explosion-proof circuit in the electromagnetic flow meter

Abstract: The application information of the newly designed explosion-proof circuit in the electromagnetic flow meter is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. For mining electrical products, its explosion-proof safety is very important. At present, the types of explosion-proof electrical products in my country are mainly flameproof and intrinsically safe; and only the intrinsically safe equipment can be used in dangerous places. Mine intrinsically safe products must be intrinsically safe. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the application of the newly designed explosion-proof circuit in the electromagnetic flowmeter. For mining electrical products, its explosion-proof safety is very important. At present, the types of explosion-proof electrical products in my country are mainly flameproof and intrinsically safe; and only the intrinsically safe equipment can be used in dangerous places. Mine intrinsically safe products are subject to intrinsic safety performance inspection, of which intrinsically safe spark test is one of the most important inspection items. When a circuit is switched on and off, energy is released in the form of sparks. When the energy is above a certain critical value, the explosive gas mixture will ignite, causing an explosion. The intrinsic safety design is to control the spark energy generated by the circuit, so as to realize the intrinsic safety of the circuit. Intrinsically safe circuits are required to be safe under normal working and fault conditions, and the sparks generated are not sufficient to ignite the explosive gas mixture in the surrounding environment. Intrinsically safe excitation circuit of electromagnetic flowmeter The excitation current of the electromagnetic flowmeter sensor is a dangerous source of electric sparks. To use the electromagnetic flowmeter underground, the excitation circuit must first meet the requirements of intrinsic safety. The electrical part of the electromagnetic flowmeter sensor consists of 2 coils, and its electrical parameters are mainly resistance and inductance, and the resistance value is 40-60Ω(two coils are connected in series), the inductance is 100-300mH, and the inductance is the source of danger. When the current flows through the inductive coil, a magnetic field will be generated inside the coil, and the magnetic field will store energy. When the circuit is disconnected, the energy stored in the coil will be released in the form of sparks. Therefore, the stored energy of the coil must be absorbed or discharged. To meet the requirements of intrinsic safety. A current branch is connected in parallel at both ends of the coil to discharge the magnetic field energy stored in the coil and reduce the spark energy during switching. In normal state, it does not affect the work of the circuit. When the circuit is disconnected, it forms a bleeder loop with the coil to clamp the voltage at the forward voltage drop of the diode (about 0.7V). However, simple current-flow diodes are only suitable for DC circuits, i.e. the case of unidirectional current flow. In order to avoid electrode polarization and eliminate mains noise interference, electromagnetic flowmeters need to use low-frequency rectangular wave excitation, so the excitation signal is a periodic bidirectional current, so traditional ordinary diodes cannot meet the application. Here, we use a new type of transient voltage suppressor for the electromagnetic flowmeter, which is a new type of electronic component developed on the basis of the Zener tube technology. The speed suddenly reduces the impedance to the on state, absorbing current and discharging energy. Its characteristics are: fast response, accurate clamping, and strong discharge energy. The most important point is that it can realize two-way clamp and discharge, meet our requirements for two-way excitation, without affecting the normal operation of the electromagnetic flowmeter. Suppresses sparking effect. Effectively inhibit the leakage of energy. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'About the application of the newly designed explosion-proof circuit in the electromagnetic flow meter'
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