Constructed from GRP composite materials that are resistant to corrosion, pressurized Explosion Proof Cabinets are certified for use in Zone 1 and Zone 2 hazardous areas and are suited for housing forward-placed analyzer equipment in industrial process facilities. Control unit regulates flow of inert purging gas or compressed air, and then monitors pressure inside cabinet to ensure that it is maintained slightly above atmospheric pressure by automatically compensating for leakage losses.