Consult for ATEX certification for low power PCBs & more

I am looking for a consultant who can assist me with obtaining ATEX certification for my low power PCBs (< 5VDC, 25 mA or so) or some way we can safely and have insurance co acceptance in hazardous C1D2 areas. The purpose of this certification is to ensure compliance with hazardous environmental regulations. Specifically, I need the whole PCB to be certified, so I am seeking someone with experience in certifying entire PCBs or helping get 'official ok' for use in those areas. Some of the PCB components will need to be exposed to open environment as these are sensors holding PCBs. We also will need some other support consultative work done. I have all the technical specifications for the parts that need to be certified, so the ideal candidate should be knowledgeable in interpreting and applying these specifications. Will need NDA to sign before sharing confidential info. More details will be shared with short-listed persons. Please submit your relevant experience with 1st response after reading in entirety. the budget figures given are place-holders only. Respond if you can honor and take the work for over a month after this posting. we shall seek fixed price best bids for this work eventually.