The world of intrinsic safety is divided into two zones: the intrinsically safe zone where dust and gas create hazardous conditions, and the rest of the world (the non-IS zone). While this is the common way to approach insulation safety, the safety margins chosen were much more conservative than is typical in IEC standards. The standard approaches the safety side by mandating insulation properties such as thickness or distance along the surface. All of the testing and design guidelines laid out in IEC 60079-11 are really to achieve those two goals. The primary concept is that the design cannot be capable of creating a spark or flame with the energy available to it so that under every conceivable fault scenario, the insulation will remain intact. It is all about safety around flammable atmospheres and dust. Let’s review the primary concepts behind IS isolator components. It tends to be a world apart from the rest of electronic design and takes a while to come to terms with the terms and world view (pun intended). If you are new to the world of intrinsic safety (IS), you might be a little overwhelmed by the terminology and concepts. New technologies are available that have tantalizing properties that would make a design smaller, simpler, lower power, faster, or all four, but it is not clear if or how you can use them because of the requirements of the IS safety standard. Digital Isolators Can Be Used in Intrinsic Safety ApplicationsÄesigners of intrinsic safety (IS) equipment know the challenges of getting signals in and out of your equipment.
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