Barrier isolator is a general term that includes two types of devices: isolators and restricted access barriers (RABS). Both are devices that provide a physical and aerodynamic (air overpressure) barrier between the external clean room environment and a work process.

Is barrier vs galvanic isolator?

Intrinsic safety barriers increase workplace safety by limiting the energy available in the process. Galvanic isolators protect field devices from external electrical currents and corrosion.

Is zener a barrier?

A zener barrier is a simple device where the voltage & current (Power, Energy) is limited into the hazardous area. The voltage is limited/clamped by a zener diode and the current limited by an output resistor. The fuse is there to protect the zener diode. … This is achieved by duplication (Zener diodes).