Explosion-Proof Camera Housings

An explosion-proof camera housing is the certified protective enclosure that allows a camera system to operate safely in classified hazardous locations where flammable gases, vapors, or combustible dusts may be present. The explosion-proof camera housing is not merely a weatherproof box—it is a precision-engineered pressure vessel that must contain any internal ignition and cool escaping gases through machined flame paths before they can reach the surrounding classified atmosphere.

How Explosion-proof camera Housings Work

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The protection concept for explosion-proof camera housings is defined under ATEX/IECEx protection type “Ex d” (flameproof enclosure) and NEC/UL “explosion-proof” designation. The housing works on the principle of containment:

• All joints, seams, threaded entries, and window interfaces are machined to precise gap tolerances defined in IEC 60079-1
• If an internal source (camera circuit fault, motor arc, LED driver failure) ignites a gas-air mixture that has entered the housing, the resulting pressure wave is contained
• Hot gases escape only through the long, narrow flame paths at joints, where they cool below the ignition temperature of the surrounding atmosphere before exiting
• The enclosure is rated for the maximum pressure generated by internal combustion of the applicable gas group, typically tested at 1.5x maximum overpressure

Types of Explosion-proof camera Housings

Explosion-proof camera housings are available in several configurations to match different camera types and installation requirements:

• Fixed camera housings (box style): Cylindrical or rectangular enclosures for fixed-focal-length or varifocal cameras. Front window (borosilicate glass or sapphire) provides the optical interface. Typical size: 150-250 mm diameter, 200-400 mm length. Suitable for Zone 1 / Division 1 perimeter and process area cameras.
• Dome camera housings: Hemispherical or full-dome flameproof enclosures with glass dome windows. Ceiling or pendant mounting. Discrete profile for indoor process areas, control rooms built in classified spaces, and pharmaceutical cleanrooms. IP66 rated standard.
• PTZ camera housings: The largest and most complex explosion-proof camera housing category, containing the entire PTZ mechanism (pan motor, tilt motor, gear train, slip rings) plus imaging assembly within a single Ex d enclosure. Typically 250-400 mm diameter, 400-600 mm length, 12-25 kg. Pan and tilt shafts are sealed with precision-machined flame path bushings.
• Miniature and compact housings: For space-constrained installations—junction areas, pipe racks, confined spaces—compact Ex d housings in 100-120 mm diameter are available for small fixed cameras with 2-4 MP resolution.

Materials and Construction

Explosion-proof camera housing materials must balance weight, corrosion resistance, and Ex d compliance:

• LM6 aluminum alloy: The most common material for standard explosion-proof camera housing construction. Lightweight, excellent machinability for precise flame path surfaces, and adequate corrosion resistance for most petrochemical environments. Not suitable for hydrogen sulfide, ammonia, or coastal marine environments without coating.
• 316L stainless steel: The preferred material for corrosive environments: offshore platforms, chemical plants with acid or chlorine exposure, pulp mills with H2S, and food-grade applications. 2-3x heavier than aluminum but provides excellent resistance to TRS compounds, chlorine, and saltwater corrosion.
• GRP (glass reinforced polymer): Available for specific IEC Ex applications where non-sparking and non-magnetic properties are required. Limited temperature range but excellent chemical resistance.

Selecting the Right Explosion-proof camera Housing

Choose an explosion-proof camera housing based on these criteria:

1. Gas group: IIC (hydrogen, acetylene) requires the tightest flame path tolerances. IIB covers ethylene, propylene. IIA covers propane, methane, and most petroleum vapors. Specify IIC housing for hydrogen environments; IIB or IIA is acceptable for most petroleum and chemical facilities.
2. Temperature class: T6 (85°C max surface) provides the widest coverage. Match to the minimum ignition temperature of the substances present.
3. Zone or Division: Zone 1 / Division 1 requires full Ex d or Ex e certification. Zone 2 / Division 2 allows additional protection methods at lower cost.
4. Ambient temperature range: Standard housings cover -20°C to +55°C. Extended-range models cover -50°C to +65°C. Heated window options available for arctic climates.
5. Conduit entry: NPT (3/4″ or 1″) for North American NEC installations; M20 or M25 metric for ATEX/European projects. Specify before ordering as conversion adapters must themselves be Ex-certified.

Veilux Explosion-proof camera Housings

Veilux manufactures a complete range of explosion-proof camera housings in aluminum and 316L stainless steel, certified to ATEX/IECEx Ex d IIC T6 and UL Class I Division 1 for the full range of Gas Groups A through D. Our housings are available in fixed, dome, and PTZ configurations, covering every standard IP camera form factor from 1 MP compact fixed to 4K PTZ with integrated 200 m IR illumination.

All Veilux explosion-proof camera housings include complete ATEX/IECEx and UL certification documentation, installation and maintenance manuals, and conduit entry seal fittings. Request a specification sheet and certificate package for your classified area project.

Explosion-Proof Camera Housing FAQ

Related Resources

• Hazardous Area Classification: Complete Guide
• ATEX Certification: Complete Guide
• Intrinsically Safe vs Explosion-Proof Cameras Explained
• Explosion-Proof PTZ Cameras

IEC 60079-1 is the governing standard for flameproof enclosure (Ex d) construction and testing, including explosion-proof camera housing requirements. See IEC.ch for the current edition.

For regulatory standards on explosion-proof camera, refer to the OSHA hazardous location standards and NFPA 70 National Electrical Code.