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How does ATEX apply downstream of a flame arrestor?

How does ATEX apply downstream of a flame arrestor?

How does ATEX apply downstream of a flame arrestor?

(OP)
If I am building an ATEX certified boiler assembly, how does ATEX apply to components such as valves and swtiches located within my boiler if they are downstream of a certified flame arrestor but also in close proximity of an ignition source (our burner)?  

RE: How does ATEX apply downstream of a flame arrestor?

You have an explosive atmopshere inside and outside? If so, I think ATEX applies to the switches and valves concerning the outside atmosphere and not concerning anything in contact with the internal gas and/or fluid due to the flame arrestor.  

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