P+F Pepperl+Fuchs safety barrier, the elite of explosion-proof products

The P+F multiplier Zener safety barrier is generally composed of a current-limiting resistor that limits the output current of the intrinsically safe side, a voltage-limiting zener diode (zener diode) that limits the output voltage of the intrinsically safe side, and a protection element ( Fast fuse, current limiting resistor). According to different protection components, it is divided into resistance protection type safety barrier and fuse protection type safety barrier.

The P+F Pepperl+Fuchs resistor-protected safety barrier current-limiting resistor R2 is used to limit the output current to meet the intrinsic safety performance requirements, and the voltage-limiting components D1 and D2 are used to limit the output voltage when the safety barrier is in normal operation. D1 and D2 are not conducting. When the safety barrier fails, such as the non-intrinsically safe input terminal, the voltage rises above the normal operating voltage and reaches the conduction voltage of D1 and D2, D1 or D2 conducts and limits the voltage to its Within the regulated value range, as long as D1 and D2 are not damaged, the intrinsically safe output terminal voltage will not increase, and it is guaranteed to be within the regulated voltage range of D1 or D2. The resistance R0 is used to protect the voltage regulator tube through D1 and D2 when a large current flows. The resistance value of R1 is very small, which is used to judge the failure of D1 or D2 when the safety barrier is in use. The principle of the fuse protection safety barrier is similar to the resistance protection safety barrier, except that the R0 resistor is changed to an RF fuse, and the protection performance is more safe and reliable.