Transcription of Intrinsic Safety Modules Selection Guide
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Intrinsic Safety Modules Selection Guide
Selection GuideOriginal InstructionsIntrinsic Safety ModulesBulletin Numbers 937TS, 937TH, 937CS, 937CU, 937ZH, 937A2 Rockwell Automation Publication 937-SG001F-EN-P - May 2021 Intrinsic Safety Modules Selection GuideWhat s InsideTo p i cPageIsolated Barriers3 Converter Barriers43 Zener Barriers63 Accessories74 Rockwell Automation Publication 937-SG001F-EN-P - May 20213 Isolated BarriersIsolated BarriersWith galvanic optical or transformer isolation, these Modules provide an interface within the Intrinsic Safety circuit that is electrically separated from the control system. A key advantage of isolated barriers is that they do not require a ground between the module and the intrinsically safe device.
This isolated barrier is used for intrinsic safety applications. It transfers digital signals (NAMUR sensors/mechanical contacts) from a hazardous area to a safe area. The proximity sensor or switch controls a form C changeover relay contact for the safe area load. The normal output state can be reversed using switches
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