What is the difference between FM intrinsically safe and ATEX intrinsically safe?

Different standards, mutual recognition among factories, and explosion-proof systems

The security probabilities of the tables themselves vary. FM’s Exd instruments can be used in Zone 1, Division 1 in the United States, whereas ATEX’s Exd can only be used in Zone 1; Zone 0 is reserved for intrinsically safe ia devices. For example: If the total time during which gas is present in a certain area of the same factory is the same, and that area is classified as Zone 0 in Europe, then the ATEX Exd table cannot be used ； In the United States, such modifications will necessarily be classified as Division 1, and FM Exd instruments can be used. There is a historical reason for this: the Americans do not consider intrinsically safe approaches to be the mainstream; instead, they focus on the development of flameproof products. To obtain an ATEX certificate for FM’s Exd instruments, it is generally not necessary to make any changes to the design. . . . This does not mean that FM labels indicate a preference for \"high-level safety\"; in China, selection is still based on ATEX standards, with the material groups corresponding directly to those standards, without the need to go through the FM process. @jiaguoyun