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The safety barrier adopts fast fuse, current-limiting resistor or voltage-limiting diode to limit the input electric energy, so as to ensure the energy output to the dangerous 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

There are Zener safety barriers and isolation safety barriers. The core components of Zener safety barriers are Zener diodes, current-limiting resistors and fast-fuse wires. The isolated safety barrier not only has a limited energy function, but also an isolation function. It is mainly composed of a loop energy limited unit, a signal and power isolation unit, and a signal processing unit. Pepperl+Fuchs Safety Barrier Isolation Barrier effectively isolates the on-site 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. With Pepperl+Fuchs isolated, there are many protective circuits, which are less likely to be accidentally damaged. On-site instrumentation is allowed to be overhauled with power, which can shorten the preparation time for engineering and reduce the parking time. Isolated safety barriers have strong signal processing capabilities. Pepperl+Fuchs series products include: Pepperl+Fuchs safety barriers, Pepperl+Fuchs encoders, P+F sensors, P+F Pepperl+Fuchs proximity switches, P+F photoelectric switches, P+F Pepperl+Fuchs ultrasonic sensors, etc.