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Pepperl+Fuchs safety barriers use fast fuses, current-limiting resistors or voltage-limiting diodes to limit the input electrical energy, so as to ensure the energy output to the hazardous area. Pepperl+Fuchs safety barriers are simple in principle, easy to implement in circuits, and low in price. However, due to their own principle defects, their reliability in application is greatly affected.

Pepperl+Fuchs Safety Barrier

Pepperl+Fuchs safety barrier has two types: Zener barrier and isolation barrier. The most commonly used is isolation barrier. The isolated safety barrier has many protection function circuits, and the possibility of accidental damage is small. It allows on-site instrumentation to be repaired with power, which can shorten the preparation time of the project and reduce the parking time. Pepperl+Fuchs isolation barrier has strong signal processing capabilities. Such as switch input status control, mV, Pt100 change to 4-20mA and so on. This provides greater convenience, reasonableness and effectiveness to the application of field instruments and control systems. When users apply DCS and ESD at the same time, choose a safety barrier with one input and two output, which can effectively isolate the two systems and avoid mutual influence between the systems. The loop-powered isolated safety barrier not only maintains the advantages of active isolated safety barriers, but also has the same wiring convenience as Zener safety barriers. It does not require another 24V power supply. It is especially suitable for DCS systems that are directly powered by I/O cards. The P+F Pepperl+Fuchs safety barrier can effectively isolate the field loop signal in the hazardous area from the loop signal in the safe area. In this way, the intrinsically safe automatic control system does not need an intrinsically safe grounding system, which simplifies the construction when the intrinsically safe explosion-proof system is applied. The isolation barrier greatly enhances the anti-interference ability of the detection and control loop, and improves the reliability of the system.