Flameproof fixed detector (Ex) can be converted as intrinsically safe (IS) detector?

If I have a flameproof fixed detector (Ex) can I make it “intrinsically safe” (IS) by using a zener barrier or galvanic isolator?

No, a flameproof detector “safety protection” cannot be changed by using a zener barrier or galvanic isolator of any sort. It can only be used as a flameproof device

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