ATEX certification for gas detectors based on IEC 60079-29-0:2025

Advantages of IEC 60079-29-0 (2025)

The 2025 publication of IEC 60079-29-0 introduces a single consolidated document that integrates general requirements and test methods for

point detectors;
open-path detectors; and
toxic gas monitoring.

In addition, the new standard presents the following special advantages:

an evolution toward a more holistic approach to gas detection is presented;
By merging point and open-path requirements into one document, the standard provides a unified baseline for safety and performance.
This consolidation ensures that as digital technologies and software-controlled features become more prevalent, the detection of flammable, toxic, and oxygen-related hazards remains consistent and reliable across the industry.

click here to download the conformity assessment checklist for IEC-60079-29-0-2025

Brief summary of main changes of the new IEC 60079-29-0

IEC 60079-29-0 supersedes the withdrawn IEC 60079-29-1 and IEC 60079-29-4.

Key changes and updates are including:

eliminated previous inconsistencies between different gas sensing technologies;
more rigorous requirements for software-controlled equipment;
specialized self-test routines;
a standardized sequential test plan to ensure hardware reliability under stress;
incorporated requirements for toxic gas safety monitoring (Type TX-SM), which were previously partially addressed in other standards like IEC 62990-1.

Scope of IEC 60079-29-0

The updated scope of IEC 60079-29-0 covers performance requirements and test methods for equipment intended to detect flammable, oxygen, and toxic gases in industrial and commercial applications.

Applicable equipment is now categorized into specific types:

Type "FL": Detectors for flammable gases, including those for mines (Group I) and industrial locations (Group II).
Type "FL-OP": Open-path (line of sight) detectors for flammable gases, which typically measure absorption over paths ranging from one meter to several kilometers.
Type "O2": Equipment for detecting oxygen deficiency, enrichment, or interstation (measuring function for explosion protection).
Type "TX": Toxic gas detectors, including those for safety monitoring (TX-SM) and open-path (TX-OP) detection.

This consolidated scope replaces the previous structure where point sensors were governed by Part 29-1 and open-path sensors by Part 29-4.

Which equipment groups are not applicable to IEC 60079-29-0?

IEC 60079-29-0 is specifically not applicable to several categories of equipment, even if they involve gas sensing. Exclusions include equipment used for:

Medical applications or purely for laboratory analysis.
The domestic environment or environmental air pollution monitoring.
Flue gas analysis and sampling systems external to the gas detection equipment.
Passive optical receivers that lack a dedicated optical source.
Equipment falling within the specific scope of IEC 60335-2-40 and IEC 60335-2-89.

What is the reason of applicability of new IEC 60079-29-0 to explosion-proof gas detectors?

While explosion proof gas detectors must comply with specific standards for their primary protection type (such as flameproof "d", intrinsic safety "i", or increased safety "e"), ATEX certification based on IEC 60079-29-0 (which is included in the explosion-proof field) is used to address functional safety and performance of the gas detectors.

A gas detector which is electrically safe in terms of explosion protection, but fails to indicate a gas hazard accurately, creates a safety risk;

therefore, the new IEC 60079-29-0 ensures the device provides a reliable indication or alarm to initiate manual or automatic protective actions before reaching a concentration of explosive gas, dust or vapors which cause an explosive atmosphere.

It ensures that the device's measuring function remains accurate under the same environmental stresses (vibration, temperature variation) expected in hazardous areas.

which areas are evaluated mainly in certification process?

The assessment of a gas detector based on IEC 60079-29-0 focuses on several critical control areas:

Constructional Integrity: Ensuring materials are resistant to corrosion and that adjustment mechanisms (like zero and sensitivity controls) do not compromise the equipment's explosion protection.
Signaling and Indicators: Strict color coding (Red for alarm, Yellow for fault, Green for power) and mandatory status signals that must be easily distinguishable.
Fault Detection Timing: New requirements state that fault signals must be indicated within 200 seconds unless specified otherwise.
Software and Data Reliability: Evaluation of program code modification controls, software versioning, and digital data transmission reliability between spatially separated components.
Sequential Testing: Equipment must undergo a specific test sequence (Table 2) that includes environmental tests, stability checks, and gas-specific performance requirements.

ATEX certification for gas detectors based on IEC 60079-29-0:2025

ATEX certification for gas detectors based on IEC 60079-29-0:2025

ATEX certification for gas detectors based on IEC 60079-29-0:2025

Advantages of IEC 60079-29-0 (2025)

The 2025 publication of IEC 60079-29-0 introduces a single consolidated document that integrates general requirements and test methods for

point detectors;

open-path detectors; and

toxic gas monitoring.

In addition, the new standard presents the following special advantages:

an evolution toward a more holistic approach to gas detection is presented;

By merging point and open-path requirements into one document, the standard provides a unified baseline for safety and performance.

This consolidation ensures that as digital technologies and software-controlled features become more prevalent, the detection of flammable, toxic, and oxygen-related hazards remains consistent and reliable across the industry.

click here to download the conformity assessment checklist for IEC-60079-29-0-2025

Brief summary of main changes of the new IEC 60079-29-0

IEC 60079-29-0 supersedes the withdrawn IEC 60079-29-1 and IEC 60079-29-4.

Key changes and updates are including:

eliminated previous inconsistencies between different gas sensing technologies;

more rigorous requirements for software-controlled equipment;

specialized self-test routines;

a standardized sequential test plan to ensure hardware reliability under stress;

incorporated requirements for toxic gas safety monitoring (Type TX-SM), which were previously partially addressed in other standards like IEC 62990-1.

Scope of IEC 60079-29-0

The updated scope of IEC 60079-29-0 covers performance requirements and test methods for equipment intended to detect flammable, oxygen, and toxic gases in industrial and commercial applications.

Applicable equipment is now categorized into specific types:

Type "FL": Detectors for flammable gases, including those for mines (Group I) and industrial locations (Group II).

Type "FL-OP": Open-path (line of sight) detectors for flammable gases, which typically measure absorption over paths ranging from one meter to several kilometers.

Type "O2": Equipment for detecting oxygen deficiency, enrichment, or interstation (measuring function for explosion protection).

Type "TX": Toxic gas detectors, including those for safety monitoring (TX-SM) and open-path (TX-OP) detection.

This consolidated scope replaces the previous structure where point sensors were governed by Part 29-1 and open-path sensors by Part 29-4.

Which equipment groups are not applicable to IEC 60079-29-0?

IEC 60079-29-0 is specifically not applicable to several categories of equipment, even if they involve gas sensing. Exclusions include equipment used for:

Medical applications or purely for laboratory analysis.

The domestic environment or environmental air pollution monitoring.

Flue gas analysis and sampling systems external to the gas detection equipment.

Passive optical receivers that lack a dedicated optical source.

Equipment falling within the specific scope of IEC 60335-2-40 and IEC 60335-2-89.

What is the reason of applicability of new IEC 60079-29-0 to explosion-proof gas detectors?

A gas detector which is electrically safe in terms of explosion protection, but fails to indicate a gas hazard accurately, creates a safety risk;

therefore, the new IEC 60079-29-0 ensures the device provides a reliable indication or alarm to initiate manual or automatic protective actions before reaching a concentration of explosive gas, dust or vapors which cause an explosive atmosphere.

It ensures that the device's measuring function remains accurate under the same environmental stresses (vibration, temperature variation) expected in hazardous areas.

which areas are evaluated mainly in certification process?

The assessment of a gas detector based on IEC 60079-29-0 focuses on several critical control areas:

Constructional Integrity: Ensuring materials are resistant to corrosion and that adjustment mechanisms (like zero and sensitivity controls) do not compromise the equipment's explosion protection.

Signaling and Indicators: Strict color coding (Red for alarm, Yellow for fault, Green for power) and mandatory status signals that must be easily distinguishable.

Fault Detection Timing: New requirements state that fault signals must be indicated within 200 seconds unless specified otherwise.

Software and Data Reliability: Evaluation of program code modification controls, software versioning, and digital data transmission reliability between spatially separated components.

Sequential Testing: Equipment must undergo a specific test sequence (Table 2) that includes environmental tests, stability checks, and gas-specific performance requirements.