Key Identification Points for Explosion-Proof Handsets: Stop Mistaking “Protective Covers” for Explosion-Proof Capabilities!

In the industrial communications field, many customers fall into a

common misconception when selecting equipment: assuming 

that any device with a protective cover and thick housing is 

explosion-proof.

However, this understanding is entirely incorrect.

A genuine explosion-proof phone is not merely about “looking 

sturdy”; it must undergo authoritative certification and professional 

explosion-proof processing. This article systematically analyzes 

the core identification criteria for explosion-proof phones to 

help you avoid pitfalls.

I. What Constitutes a Genuine Explosion-Proof Phone?

Explosion-proof phones are industrial communication devices 

specifically designed for flammable and explosive hazardous 

environments. 

They are widely used in:

Petrochemical plants

Underground coal mines

Natural gas stations

Tunnels and utility tunnels

Dust explosion risk workshops

In these environments, even a single electrical spark can trigger

major accidents. Therefore, explosion-proof radios must eliminate

ignition risks from the design stage.

II. Core Identification Standard 1: EX Certification Mark 

(The Sole Authoritative Standard)

The first step in determining whether a device is a genuine 

explosion-proof radio is to check for the EX certification mark.

International mainstream explosion-proof certifications include:

ATEX (EU Explosion-Proof Certification)

IECEx (International Explosion-Proof System Certification)

Why is the EX Mark so crucial?

✔ It signifies the device has passed rigorous explosion-proof testing

✔ It provides clear classification of explosion-proof ratings

✔ It enables legal use in hazardous gas or dust environments

Devices without the EX Mark cannot be considered 

explosion-proof telephones, even if they have protective covers.

This point is critical.

Many ordinary industrial phones merely add metal casings or rain

covers without undergoing explosion-proof electrical certification. 

Their internal circuits may still generate arcs or sparks.

Rugged housing ≠ Explosion-proof safety

III. Core Identification Standard 2: Dual Protection Processes

Genuine explosion-proof phones require not only certification

but also specialized processing techniques.

1️⃣ Surface Protection Process — Anti-static Coating

In flammable environments, static electricity buildup can also

serve as an ignition source.

Therefore, explosion-proof phones typically employ:

Specialized anti-static spraying process

Corrosion-resistant industrial-grade coating

Surface resistance control treatment

This not only prevents rust and corrosion but, more 

importantly, avoids the risk of static sparks.

2️⃣ Internal Structure Treatment — Explosion-Proof 

Circuit Design

The true explosion-proof core lies within.

This includes:

Intrinsically safe circuit design (limiting energy output)

Explosion-proof circuit board treatment

Flameproof encapsulation of critical components

Strict control of electrical clearances and creepage 

distances

Professional inspection and factory explosion-proof 

testing procedures

Every step directly impacts whether hazardous 

electrical sparks may occur.

IV. Common Industry Misconceptions

❌ Protective cover ≠ Explosion-proof

❌ Thick metal housing ≠ Explosion-proof

❌ High waterproof rating ≠ explosion-proof

❌ IP65/IP67 ≠ explosion-proof

These represent protective performance, not 

explosion-proof certification.

Waterproofing, dustproofing, and impact resistance 

fall under environmental protection ratings, while 

explosion-proofing pertains to electrical safety 

ratings—two entirely distinct categories.

V. The True Value of Explosion-Proof Handsets

Explosion-proof handsets are more than 

communication devices; they are:

A vital component of industrial safety systems

A fundamental safeguard for corporate 

production safety

A lifeline for personnel safety in hazardous 

environments

It achieves this through:

✔ Authoritative EX certification

✔ Surface anti-static treatment

✔ Intrinsically safe internal circuit design

✔ Rigorous testing protocols

Eliminating ignition risks at the source to ensure

intrinsic safety.

VI. Summary: Three-Step Quick Authentication 

for Explosion-Proof Handsets

1️⃣ Verify presence of EX certification markings

2️⃣ Confirm anti-static coating treatment

3️⃣ Ensure use of intrinsically safe circuit design

Any absence of these elements disqualifies the 

device as a genuine explosion-proof handset.