explosionproofradios
Engineering reference · updated Sep 2026

ATEX & IECEx certified
two-way radios for Zone 1 & Zone 2
hazardous areas.

Compare every ATEX/IECEx Zone 1 two-way radio (DMR, TETRA, NXDN and PoC) side by side, for HSE and procurement teams.

Seven radios from four vendors, checked against manufacturer certificates of conformity. All are certified IIC T4, covering Group II gases including hydrogen.

Browse radios → DMR vs TETRA vs PoC
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§ 01 — Certified radios

Every radio, one comparable layout.

Sorted by overall score. Each card carries the full Ex notation, zone coverage, and a deployment note — click to expand.
§ 02 — Why certification type matters

Three decisions that fail procurement review.

Selecting the wrong zone rating or gas group for your facility is not a compliance issue — it is an ignition risk. The distinctions below drive most HSE rejections.

01 · Zone Frequency of explosive mixture

Zone 1 vs Zone 2.

Zone 1
An atmosphere in which an explosive mixture is likely to occur in normal operation, occasionally. Requires category 2G equipment — typically Ex ib.
Zone 2
Explosive mixture not likely to occur, and only for short periods if it does. Category 3G equipment permitted (Ex nA / Ex ec).
Radio-specific consideration
Two-way radios transmit RF energy, which adds to the ignition risk calculation. All radios on this page are Zone 1 certified — safe for both Zone 1 and Zone 2 deployment.
02 · Scheme Where it's legally required

ATEX vs IECEx.

ATEX · 2014/34/EU
Mandatory CE-marking directive for equipment placed on the EU/EEA market. Requires a Notified Body-issued EU-Type Examination Certificate.
IECEx
Voluntary international scheme accepted in 30+ countries including UK, Australia, the Gulf, and much of APAC. Issued against the same IEC 60079 series.
Mutual recognition
An IECEx CoC is a valid technical basis for ATEX certification, but the IECEx mark alone is not sufficient for EU deployment. Dual-certified equipment is the safe procurement default.
03 · Gas group Apparatus group II

IIA, IIB, IIC.

IIA
Propane-like atmospheres. LPG, fuel storage.
IIB
Ethylene-like atmospheres. Most petrochemical downstream.
IIC
Hydrogen & acetylene. MIE ≈ 0.017 mJ — the hardest Group II target. IIC implies IIA and IIB by inclusion.
All radios on this page
Every radio listed is certified IIC T4 — covering the full range of Group II gases including hydrogen. No need to worry about gas group mismatch.
§ 03 — Radio technology

DMR vs TETRA vs PoC, honestly.

Three radio technologies dominate hazardous area communications, and Kenwood's NXDN is a fourth option on this page. The right choice depends on infrastructure, coverage requirements, and whether you need mission-critical voice.

DMR Digital Mobile Radio

The workhorse.

Open ETSI standard (TS 102 361). Two time slots per 12.5 kHz channel doubles capacity vs analogue. Tier II (conventional) and Tier III (trunked) modes.

  • Infrastructure — Own repeaters. No cellular dependency.
  • Coverage — Site-specific. Excellent in-building penetration on UHF.
  • Latency — Near-zero PTT latency (<300 ms).
  • Best for — Refineries, chemical plants, manufacturing sites with existing repeater infrastructure.
TETRA Trunked Radio

Mission-critical.

ETSI standard for public safety and critical infrastructure. End-to-end encryption, group calls, priority pre-emption, and direct mode operation.

  • Infrastructure — Dedicated TETRA base stations. Higher capex.
  • Coverage — Wide-area via national TETRA networks or private systems.
  • Reliability — Designed for 99.999% availability. Direct mode when network fails.
  • Best for — Large-scale oil & gas, emergency services, offshore platforms, national infrastructure.
PoC Push-to-Talk over Cellular

Cellular-based.

Uses 4G/5G mobile networks for PTT communication. No dedicated radio infrastructure required. Nationwide coverage where cellular exists.

  • Infrastructure — None. Uses public or private LTE/5G.
  • Coverage — Wherever there is cellular signal.
  • Latency — Higher PTT latency (1–3 sec) vs DMR/TETRA.
  • Best for — Distributed sites, mobile workers, organisations without radio infrastructure budget.
Criterion DMR TETRA PoC (LTE/5G)
StandardETSI TS 102 361ETSI EN 300 3923GPP MCPTT
InfrastructureOwn repeatersTETRA base stationsPublic/private LTE
PTT latency<300 ms<300 ms1–3 sec
EncryptionARC4 / AES-256TEA1–TEA3 / E2EETLS / app-layer
Group callsYes (Tier II/III)Yes (native)Yes (app-based)
Typical capexMediumHighLow
Cellular dependencyNoneNoneFull
§ 04 — Methodology

How this guide scores, and where the specs come from.

Score composition
Overall score is a weighted composite: zone & gas group coverage (25%), audio quality & power output (20%), ruggedness / IP rating (15%), safety features (15%), technology standard maturity (15%), battery life (10%).
Spec sourcing
Specifications are drawn from manufacturer datasheets, IECEx Online Certificate of Conformity records, and ETSI standards. Where a value was unverifiable at publication, "—" is shown.
Scope
Only radios from established, non-Chinese manufacturers with verifiable ATEX/IECEx Zone 1 certificates are listed. PoC radios are included where they represent the category's closest functional alternative. For a detailed breakdown of intrinsic safety certification and how to verify a radio's Ex certificate, see the intrinsically safe radios buyer's guide.
§ 05 — FAQ

Frequently asked questions

What is an explosion proof radio?

An explosion proof radio is a two-way communication device certified under ATEX or IECEx for use in explosive atmospheres. It limits electrical and thermal energy so it cannot ignite flammable gases, vapours or dust. Most ATEX radios use intrinsic safety (Ex ib): the circuits are designed so that no fault can produce enough energy to cause ignition.

What is the difference between DMR, TETRA, NXDN and PoC radios?

DMR (Digital Mobile Radio) is an open standard for digital two-way radio, widely used in commercial and industrial settings. TETRA (Terrestrial Trunked Radio) is a mission-critical standard used by emergency services and large industrial sites, with group calls, encryption and high reliability. NXDN, used by Kenwood NEXEDGE radios, is a narrowband digital standard similar in role to DMR. PoC (Push-to-Talk over Cellular) radios use 4G/5G mobile networks instead of dedicated radio infrastructure, giving wider coverage but depending on cellular availability.

Can I use a normal radio in a hazardous area?

No. Standard two-way radios are not certified for explosive atmospheres and can produce sparks or heat that ignite flammable gases or dust. Only ATEX or IECEx certified radios may be used in classified hazardous areas. Using unsuitable equipment in a Zone 1 or Zone 2 area breaches the ATEX Workplace Directive 1999/92/EC (EU) and DSEAR (UK).

What certifications are required for a radio in Zone 1?

A radio used in Zone 1 needs Equipment Group II Category 2G certification. In the EU/EEA, ATEX certification under Directive 2014/34/EU is mandatory. For international deployments, IECEx certification is accepted in over 30 countries. The protection concept is typically Ex ib (intrinsic safety). Radios certified under both ATEX and IECEx give the most deployment flexibility.

Which explosion proof radio is best for oil and gas?

DMR radios like the Motorola DP4401Ex or DP4801Ex are widely deployed in oil and gas for their DMR Tier II/III capabilities, GPS tracking and Man Down safety features. On sites with existing TETRA infrastructure, the Motorola MTP8550Ex or Sepura STP8X000 provide mission-critical voice with end-to-end encryption. All are Zone 1 IIC T4 certified, covering hydrogen-class atmospheres found in refineries.

§ 06 — Contact

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