Dust Pressurization Products
From Expo Technologies

Pressurization is a method of protection used in Class II areas or Zone 21, 22 Hazardous Locations to prevent the ingress of dust into electrical enclosures.

Pressurization is generally used for electrical / instrument enclosures that are too large to be made explosion-proof or too high powered to use intrinsic safety.

"Good house keeping" is the key to all dust hazard applications where the inside of the enclosure should be clear of dust before closing the door of the enclosure and applying the pressure.

A pressure must be maintained within the enclosure to prevent any ingress of dust. Normally compressed air is used to maintain this over pressure. Once pressure has been applied the power can then be switched on.

North American standard for Dust Protection is NFPA 496. Equipment designed to this concept is suitable for use in Class II, Division 1 or 2 hazardous locations.

IEC and European standards for Dust Protection are IEC/En 61241-0 & 61241-4. Equipment designed to this concept is suitable for use in Zone 21 or 22 Hazardous Locations.

ATEX certified SmartPurge (microprocessor controlled) systems