Pressurization systems for use in hazardous locations

Using standard automation components spends the user considerable advantages:

• Easy installation and implementing
• Hard- and software compatibility and -flexibility
• Verified function modules, „All from one source“
• Standard configuration programming
• Standard user interfaces
• Standard service

In many production facilities occur explosive gas or dust atmospheres were standard devices are not suitable.

In most cases special Ex- hardware must be used, followed with high acquisition and life time costs.

The pressurized enclosure technology represents in most causes an interesting alternative to use verified "Non Ex- " systems even in hazardous areas.

Pressurized enclosure systems (Ex p): Concept

The use of pressurized enclosures provides the operation of ‘non Explosion protected’ devices in hazardous areas of Zone 1, 21, 2 and 22. The protection type ‘pressurization’ is based on the principle of maintaining a constant pressure using air or a protective gas to prevent an explosive mixture forming near the apparatus inside the pressurized enclosure.

This is achieved by placing and operating the non Ex- devices inside of an Ex p- housing. This housing has a small but constant overpressure of air or protective gas and prevents the infiltration of combustible gases or dusts.