For Class I applications this system operates by forcing air or an inert gas through the enclosure for a specified time until all of the hazardous gas has been removed (purging). After purging, a constant pressure with the enclosure is maintained and the equipment with the enclosure can be energized. If pressure in the enclosure drops below its minimun, then power to the enclosure is disengaged and the purging sequence will begin.
For Type Y, Type Z, and Type nP applications.
Type nP- Class I, Div 2 / Zone 2 to non-hazardous area applications. ATEX, UL,cUL & FM classified.