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In signal and control circuits that can operate with low currents and voltages, the intrinsic safety approach simplifies circuits and reduces installation cost over other protection methods. Areas with dangerous concentrations of flammable gases or dust are found in applications such as petrochemical refineries and mines.
Fieldbus Intrinsically Safe Concept (FISCO), which was first developed by PTB (Physikalisch-Technische Bundesanstalt, the national metrological institute of Germany) as a method to provide higher power to a Fieldbus segment in hazardous areas. The FISCO concept, considers the entire circuit of the Fieldbus segment.
Unlike ATEX which uses numbers to define the safety "Category" of equipment (namely 1, 2, and 3), the IEC continued to utilise the method used for defining the safe levels of intrinsic safety namely "a" for zone 0, "b" for zone 1 and "c" for zone 2 and apply this Equipment Level of Protection to all equipment for use in hazardous areas since ...
(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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For this reason, optional intrinsic safety is fully integrated into the definitions of the Ethernet-APL communication standard. In the technical specification 2-WISE [3] the 2-wire intrinsically safe Ethernet is defined. The intrinsic safety barrier is an electronic circuit at each output or input of a switch or instrument. It prevents ...
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