Purge Wizard for Enclosure Purge & Pressurization Units
Expo’s Purge Wizard identifies the appropriate Expo Purge & Pressurization unit for your enclosure, given your requirements.
Just enter the appropriate regulation- IECEx, NEC, ATEX; the Hazardous area class or zone; the Enclosure volume; Currents and Mounting Type.
Motor and Room Purge is more complex. We’d like to discuss your requirements in detail. For complete enclosures with purge & pressurization units, please see Purge & Pressurization for Enclosures
Our engineering team will offer to double-check your desired Purge & Pressurization unit is appropriate, before quoting.
For an immediate response, please phone our UK headquarters at +44 208 398 8011 or US Headquarters at (888) NFPA-496.
Purge Wizard Terminology
Regulation: Governing body or agency responsible for final approval of equipment in the hazardous area.
Hazardous Area Classification: The area rating where you’ll install the electrical equipment.
- Class I = Gas
- Class II = Dust
- Division 1 = Present under normal circumstances
- Division 2 = Present under abnormal circumstances
- Zone 1 = Gases are present under normal circumstances
- Zone 2 = Gases are present under abnormal circumstances
- Zone 21 = Dusts are present under normal circumstances
- Zone 22 = Dusts are present under abnormal circumstances
Enclosure size up to: The enclosure’s volume. Usually, the enclosure’s Length x Width x Height = Volume
Current to be isolated: When purging in a Division 1 or Zone 1 area all voltage entering the enclosure must be isolated in order to avoid having power in the enclosure with the hazardous gas or dust. You can provide your own isolation and connect to our PO (pneumatic output bulkhead) interface or use one of our standard units or IS (intrinsically safe dry contacts). If you are working in an ATEX only area the PA (power and alarm) increased safety output can be used.
Signals to be isolated: When purging in a Division 1 or Zone 1 area all voltage including signals (such as Ethernet) entering into the enclosure must be isolated. You can provide your own isolation unit and connect to our PO (pneumatic output bulkhead) interface or IS (intrinsically safe dry contacts) or use one of our standard units.
Mounting Type: This is the way in which you want our system to be configured for mounting on to your enclosure or surrounding area.