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A safety barrier is a current-limiting circuit located between the field devices and the equipment in the control room; it serves to limit the electrical energy supplied from the control room to the field instruments, so that neither sparks sufficient to ignite hazardous gases nor surface temperatures high enough to cause such ignition are generated, thereby eliminating potential sources of explosion. When selecting a safety barrier, it is necessary to consider that its model should be suitable for the type of instruments present on site. Additionally, it is important to ensure that the safety barrier is compatible with the requirements of intrinsically safe instruments, as well as to address the issue of impedance matching within the resulting intrinsically safe system. Changhui Instrument Selection: yunrun.com.cn/product/ Function of safety barriers: Safety barriers are used in intrinsically safe systems as safe interfaces for intrinsically safe circuits; they enable signals to be transmitted between the hazardous area and the safe area, as well as to handle hazardous signals. Safety barriers are usually installed in intrinsically safe circuits or non-intrinsically safe circuits. The safety barrier is located between the field devices and the equipment in the control room; regardless of the condition of the equipment in the control room, the safety barrier ensures that the signals transmitted are safe. The isolated safety barrier is a type of safety barrier whose design and construction are tailored to meet the requirements of intrinsically safe systems. Although it is more expensive than zener-type safety barriers, it offers excellent performance and brings many benefits to users. Safety barrier: yunrun.com.cn/product/list_85.html. Advantages of isolated safety barriers: 1. Isolated safety barriers use a three-way isolation method, and no grounding circuit is required, which makes them very convenient for construction and design. 2. It can be used in hazardous areas, reducing the requirements for instruments in such areas. Since the signal lines do not need to be grounded, interference to the signals can be minimized, thereby improving the reliability of the system. 3. Isolated safety barriers possess excellent signal processing capabilities, enabling them to handle signals of various types such as resistive, thermocouple, and frequency-based signals. 4. It is capable of outputting two signals, which are isolated from each other; this allows two devices to use the same signal source without any interference. Not only that, but isolated safety barriers can also enhance the safety and insulation of electrical equipment. Due to the use of measures such as voltage and current limiting as well as isolation, isolated safety barriers not only prevent dangerous energy from entering the hazardous area through intrinsically safe terminals, thereby enhancing the system’s intrinsically safe explosion-proof properties, but they also improve the system’s resistance to interference, **increasing the reliability of its operation. The 24VDC power supply, after going through a DC-AC-DC conversion, outputs various voltages required by the module circuit.