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A 'Zener Barrier', opto-isolator or galvanic unit may be used to assist with certification. A special standard for instrumentation is IEC/EN 60079–27, describing requirements for Fieldbus Intrinsically Safe Concept (FISCO) (zone 0, 1 or 2) (This special standard has been withdrawn, and has been partially replaced by: IEC/EN60079-11:2011 and ...
Intrinsic safety (IS) is a protection technique for safe operation of electrical equipment in hazardous areas by limiting the energy, electrical and thermal, available for ignition. In signal and control circuits that can operate with low currents and voltages, the intrinsic safety approach simplifies circuits and reduces installation cost over ...
The barrier in the isolator allows 350 mA to be run through the segment up to the Spur/junction Box through trunk cable. Since infallible resistors are used, devices from Zone 0/1 or 2 can be direct connected. Having 350 mA, now allows users to power up to 16 Fieldbus devices (20 mA each) at 500 m while retaining intrinsic safety.
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.
(Kletz originally used the term intrinsically safe in 1978, but as this had already been used for the special case of electronic equipment in potentially flammable atmospheres, only the term inherent was adopted. Intrinsic safety may be considered a special subset of inherent safety). In 2010 the American Institute of Chemical Engineers ...
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