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In the documentation related to instrument selection, people may be familiar with the concept of explosion protection for instruments, but they probably know very little about the specific principles behind it. Intrinsically safe instruments are also known as spark-safe instruments. Its explosion-proof performance is achieved not through external measures such as ventilation, inflation, oil filling, or flame isolation, but by the circuit itself, making it intrinsically safe. It can be used in all hazardous locations as well as with all explosive gas and vapor mixtures. It can also be maintained and adjusted while powered on. But. It cannot be used alone. It must form an intrinsically safe circuit together with intrinsically safe associated equipment (safety cabinets) and external wiring in order to exert its explosion-proof function. Its feature is that, whether in normal operation or in case of a fault, the sparks generated by the circuits and systems, as well as the temperatures reached, will not ignite explosive mixtures. So how are the explosion-proof measures for intrinsically safe instruments implemented? 1. The connection wires of the instrument should not create excessive distributed inductance and distributed capacitance, in order to reduce the energy stored in the circuits ； 2. Use safety barriers to separate the circuits in hazardous areas from those in non-hazardous areas, thereby limiting the energy that can be transmitted from non-hazardous areas to hazardous areas. 3. Utilize new types of integrated circuit components to construct the instrument circuits, allowing them to operate at lower voltages and lower currents.