What is the difference between a safety barrier and an isolation barrier?
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Safety barrier: It limits the energy entering the area by regulating voltage and current, ensuring that no sparks are generated in the wiring there under any circumstances, thereby preventing explosions. This type of explosion prevention method is known as intrinsically safe. Isolation barrier: 1. An isolated safety barrier incorporates an isolation function on top of the standard safety barrier capabilities; it prevents ground loop currents from interfering with signals and simultaneously protects the system from hazardous energies present in the field. For example, if a large current flows into the circuit on site, it will damage the isolation barrier without affecting the IOs. 2. It can sometimes also be understood as an isolator that lacks safety barrier functionality; in other words, it has only isolation capabilities to prevent signal interference and protect the system’s IOs, but it does not provide an intrinsically safe circuit. For use in non-explosion-proof environments. Safety barriers and isolation barriers protect both the field equipment and the system.
I remember it being classified in this way: safety barriers are divided into Zener safety barriers and isolated safety barriers. Zener safety barriers are rarely used these days; isolated safety barriers are the ones that are more commonly used. It is also known as a signal isolator, and its functions may vary.
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Since the character for fence is used, it should generally be a safety fence. Those with only isolation functionality are generally called signal isolators or signal isolation cards, and cannot be used in intrinsically safe circuits.