Thanks to everyone for their help and advice. I am now much wiser and educated in the ways of intrinsically safe devices and hazardous areas, not to mention staring down the barrel of $20,000 of extra cost on the job
For those I communicated with:
Pushbuttons and indication - Using a EXe rated box from NHP which holds the button and LED. At $500 each they're expensive but the upside is I don't need a barrier for them.
Siren/Beacon - Have found an E2S unit for $700 but I need a barrier.
Temp/RH sensor - Still looking but finding one that has a current IEC Ex or ANZ Ex certification is proving an issue. Vaisala have one for ~$3000+ a 2 channel barrier.
Barriers - Got an "Engineering guide book" from Pepperl + Fuchs which is fantastic; explains the lot. Certification is again an issue but galvanic barriers seem to be plentiful so I should be ok there.
Thanks again.




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+ a 2 channel barrier.
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