💡 3 Key Takeaways

Ordinary electronic devices can become ignition sources in hazardous areas.
Explosion-proof certified products differ entirely in enclosure, circuits, materials, and markings.
WANDI's EDW500 holds both IECEx and ATEX international explosion-proof certifications.

Why Is Explosion-Proof Certification So Critical?

Imagine turning on a gas detector at a gas-leak site — and the detector itself triggers an explosion. It sounds terrifying, but it can actually happen. A tiny static spark from a phone, friction heat from a motor, or an arc from a short circuit — all of these become lethal ignition sources in hazardous areas.

That's why hazardous industrial sites must use only specially designed and certified equipment. This certification is known as Explosion-Proof Certification.

Petrochemical refinery plant emergency flare — typical explosion hazardous area — Petrochemical plants, gas facilities, and chemical factories are typical hazardous areas classified as Zone 0/1/2 (Source: Unsplash / Chris LeBoutillier)

The 3 Elements of Explosion — Why Explosion-Proof Matters

An explosion requires three elements simultaneously:

Flammable substance — Methane, hydrogen, LPG, gasoline vapor, combustible dust, etc.
Oxygen (air) — 21% atmospheric oxygen is sufficient
Ignition source — Sparks, hot surfaces, static electricity, friction heat, arcs, etc.

Elements 1 (flammable substance) and 2 (oxygen) are difficult to control at industrial sites. Therefore, the core principle of explosion-proofing is to completely eliminate ignition sources. Explosion-proof products are designed from the ground up to prevent any ignition source from occurring.

Explosion-Proof vs. Standard Products — What's Actually Different?

They may look similar on the outside, but the internal design and certification structure are on an entirely different level.

Category	Standard Product	Explosion-Proof Certified Product
Enclosure	Standard plastic/metal	Certified explosion-proof enclosure meeting thickness/strength specifications
Circuit Design	Standard PCB	Current/voltage/energy-limited (Intrinsic Safety ia/ib)
Battery	Standard lithium-ion	Certified explosion-proof battery, fully encapsulated
Surface Temperature	No limit	Temperature class (T1–T6) limited — T4 is ≤135°C
Certification Tests	None	Explosion, mechanical strength, and ignition energy tests
Product Marking	Basic info	Ex marking (protection type, gas group, temperature class, EPL)
Permitted Locations	Non-hazardous areas only	Hazardous areas including Zone 0/1/2

How to Read Ex Markings

Ex da ia IIC T4 Ga

Symbol	Meaning	Description
Ex	Explosion-proof mark	Indicates an explosion-protected certified product
da, ia	Protection type	da = Flameproof, ia = Intrinsically Safe
IIC	Gas group	IIA (methane/LPG) → IIB (ethylene) → IIC (hydrogen/acetylene — strictest)
T4	Temperature class	Max surface temperature 135°C or below
Ga	EPL (Equipment Protection Level)	Ga = usable in Zone 0 (most dangerous areas)

International Certifications — IECEx and ATEX

While explosion-proof certification varies by country, the two most widely recognized global standards are IECEx and ATEX.

Certification	Full Name	Applicable Region
IECEx	IEC System for Certification (International Electrotechnical Commission)	Worldwide (mutual recognition across 30+ countries)
ATEX	EU Directive 2014/34/EU	European Union member states

Both certifications are based on the same IEC 60079 series of standards. A product holding both IECEx and ATEX certifications can be used in virtually all hazardous areas worldwide.

EDW500's Actual Explosion-Proof Certificates

The WANDI EDW500 portable multi-gas detector has been issued both IECEx and ATEX international explosion-proof certifications by the global testing body TÜV SÜD Product Service GmbH.

📜 IECEx Certificate (International)

Certificate No.	IECEx TPS 25.0057X
Status	Current (Valid)
Date of Issue	2026-04-10 (Issue No: 1)
Issuing Body	TÜV SÜD Product Service GmbH (Munich, Germany)
Product	Portable gas detector — EDW500a-bbcde series
Ex Marking	Ex da ia IIC T4 Ga
Standards	IEC 60079-0:2017, 60079-1:2014, 60079-11:2023
Technical Certifier	Gareth Liao

📜 ATEX Certificate (European Union)

Certificate No.	TPS 25 ATEX 114935 0006 X Rev. 01
Legal Basis	EU Directive 2014/34/EU
Date of Issue	2026-05-07 (Munich)
Issuing Body	TÜV SÜD Product Service GmbH (Notified Body No. 0123)
Equipment Category	Category 1G (usable in Zone 0 gas environments)
Ex Marking	II 1G Ex da ia IIC T4 Ga
Standards	EN IEC 60079-0:2018, 60079-1:2014, 60079-11:2012

✅ What These Certificates Guarantee

Zone 0 Usable — safe even in the most dangerous areas where explosive gas is continuously present
Gas Group IIC — covers the most sensitive gases including hydrogen and acetylene
Temperature Class T4 — surface temperature maintained at 135°C or below
EPL Ga — highest equipment protection level
4 Sensor Types Supported — EC, catalytic, NDIR, PID sensor combinations
NB-IoT + Bluetooth wireless communication — safe data transmission even in hazardous areas

🏆 IECEx + ATEX Dual-Certified EDW500

Usable in all hazardous zones (0, 1, 2) — rare in the Korean market

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Which Sites Require Explosion-Proof Equipment?

Zone	Condition	Typical Sites	EDW500
Zone 0	Explosive gas continuously present	Storage tank interiors, separator interiors	✅ EPL Ga
Zone 1	Gas possible during normal operation	Petrochemical/refinery processes, gas stations	✅ Usable
Zone 2	Gas only in abnormal conditions	Storage warehouses, pump rooms	✅ Usable

WANDI's Explosion-Proof Gas Detector Lineup

Portable — EDW500 Multi-Gas Detector

EDW500 portable multi-gas detector explosion-proof certified product — EDW500 portable multi-gas detector — deployed for confined-space asphyxiation prevention (Source: WANDI Case #275)

Dual International Certification: IECEx TPS 25.0057X + ATEX TPS 25 ATEX 114935 0006 X Rev. 01
Explosion-Proof Rating: Ex da ia IIC T4 Ga (usable in Zone 0–2)
Measurable Gases: Up to 4 sensor combinations — EC, catalytic, NDIR, PID
Communication: Bluetooth + NB-IoT wireless
Free IoT Cloud Monitoring included

Fixed Installation — GLD Series Gas Detectors

Fixed structure — 24/7 monitoring for chemical plants, LNG/LPG facilities, refineries
Explosion-proof enclosure — rugged metal housing with flameproof (Ex d) design
Multiple signal outputs — 4-20mA, Modbus RS-485

Related Guides for Hazardous Area Safety

📖 5-Gas Detector Complete Guide — Industrial Safety & Health Act

5-gas definitions, regulations, and 7 selection criteria

📖 5-Gas Detector TOP 5 Comparison

EDW500 · MicMeta · BW Ultra objective comparison + scenario recommendations

📖 Confined Space Definition, Hazards & Safe Work Procedures

Revised OSH Act requirements + EDW500 application guide

📖 EDW500 Free IoT Feature Complete Guide

DCMS cloud real-time monitoring guide

📖 Why Do Gas Detectors Need IoT?

Real accident cases demonstrating IoT importance

📖 Gas Sensor Pros & Cons — Complete Guide

EC · Pellistor · PID comparison and selection guide

Closing — Explosion-Proof Certification Is Not a Cost, It's Insurance

Explosion-proof products cost more than standard ones. However, the human casualties and property damage from a single explosion can be tens of thousands of times the price of a detector. When selecting a gas detector for use in hazardous areas, always verify the certificate number, issuing body, Ex marking, and EPL grade.