I’m asking if there are experts in intrinsically safe instrument design and intrinsically safe testing.

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Are there any experts in intrinsically safe instrument design and intrinsically safe testing? Please give me your guidance. Especially regarding the testing of intrinsically safe circuits: First, when there is an intrinsically safe circuit board (sometimes along with a circuit design schematic), how does one determine which points or circuits are hazardous? And what areas are typically tested for intrinsically safe spark testing as part of the explosion protection certification process? Secondly, after knowing how they conduct experiments, I understand how to design intrinsically safe instruments. In a few words, I will explain how the spark ignition test for intrinsically safe circuit boards is carried out, and how I should design intrinsically safe instruments to achieve intrinsically safe explosion protection. I hope the experts here will be kind enough to offer their guidance! ! ! ! !