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Hazardous-Location Computers: ATEX, IECEx & Class I Div 2 Explained
Teguar Editorial Team · April 4, 2026
In oil and gas, chemical, mining and grain-handling facilities, the air itself can be explosive — and an ordinary computer's tiny electrical sparks are a potential ignition source. Hazardous-location computers are certified to operate safely in these atmospheres. This guide explains the certifications, the zone system, and how to specify correctly.
Where flammable gases, vapours or combustible dust can be present, safety turns on a single question: could this device ignite the atmosphere? A normal computer, with its switching electronics and potential for sparks or hot surfaces, can. Hazardous-location certification is the rigorous, legally-backed answer that lets computing happen safely in these environments — and specifying it correctly is a safety and compliance matter, not just a feature choice.
Key takeaways
- Hazardous-location computers are certified so they can't ignite explosive gas, vapour or dust atmospheres.
- Key schemes: ATEX (Europe), IECEx (international) and the North American Class/Division system (e.g. Class I Div 2).
- Areas are classified by how often a hazardous atmosphere is present — Zones (0/1/2, 20/21/22) or Divisions (1/2).
- You must match the certified equipment to the specific zone/division and substance group of your site — verify with your safety authority.
The certification schemes
The European directive governing equipment for explosive atmospheres. ATEX-certified computers are marked with their equipment group and category and the zones they're approved for. Required for hazardous areas in the EU.
The international certification scheme for explosive atmospheres, widely recognised across many countries. Often aligned with ATEX, it eases global deployment of the same certified equipment.
The North American system classifies areas by Class (I gases/vapours, II dust, III fibres) and Division (1 = hazard present in normal operation, 2 = present only abnormally). Class I Div 2 — flammable gases present only under abnormal conditions — is the most common rating for hazardous-area computers.
Zones, divisions and why they matter
Hazardous areas are classified by how often an explosive atmosphere is present. The IEC/ATEX system uses Zones (0/1/2 for gases, 20/21/22 for dust — lower number, more frequent), while North America uses Divisions (1 = present in normal operation, 2 = only abnormally). Certified equipment is approved for specific zones/divisions and substance groups, so a computer rated for Zone 2 / Div 2 is not automatically safe in Zone 1 / Div 1.
This is a safety and legal domain — get the area classification from your facility's hazardous-area documentation and your safety authority, and match certified equipment to it exactly. Never substitute a lower-rated device or treat these ratings as marketing tiers.
How to specify
Start from your site's area classification (zone/division and gas/dust group and temperature class), then select a computer certified for that exact classification under the scheme your region requires (ATEX, IECEx or Class/Division). These units combine the certification with the rugged, sealed, often fanless design the environment also demands. Confirm the full marking string, not just "ATEX-rated."
The bottom line
Hazardous-location computers let you compute safely where the atmosphere can explode, by being certified — under ATEX, IECEx or the Class/Division system — not to become an ignition source. Because the ratings map to specific zones/divisions and substances, you must classify your area precisely and match certified equipment to it, verified with your safety authority. Explore rugged industrial computers and talk to us about hazardous-area requirements via a quote request.
Frequently asked questions
What is a hazardous-location computer?
A computer certified to operate safely in atmospheres where flammable gases, vapours or combustible dust may be present, so that its electronics cannot ignite the atmosphere. It's certified under schemes like ATEX, IECEx or the North American Class/Division system.
What is the difference between ATEX, IECEx and Class I Div 2?
ATEX is the European directive, IECEx is the international scheme, and Class/Division is the North American system. Class I Division 2 covers areas where flammable gases are present only under abnormal conditions — the most common rating for hazardous-area computers.
What are zones and divisions?
They classify how often an explosive atmosphere is present. IEC/ATEX Zones are 0/1/2 for gases (and 20/21/22 for dust), with lower numbers meaning more frequent presence; North American Divisions are 1 (present in normal operation) and 2 (present only abnormally).
Can I use a Division 2 computer in a Division 1 area?
No. Certified equipment is approved for specific zones/divisions and substance groups. A Division 2 or Zone 2 rating does not make a device safe in the more hazardous Division 1 or Zone 1 — you must match the certification to your area classification.
How do I specify a hazardous-location computer?
Obtain your site's area classification (zone/division, gas/dust group, temperature class) from your hazardous-area documentation and safety authority, then choose a computer certified for that exact classification under the scheme your region requires.