IEC 60079-29-2:2015

Overview

IEC 60079-29-2:2015 - "Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen" is an IEC international standard that provides guidance and recommended practice for the safe application of electrically operated gas detection equipment. It covers Group II equipment (industrial and commercial safety applications) and Group I equipment for underground coal mines, for detectors that comply with IEC 60079-29-1 or IEC 60079-29-4. Edition 2.0 (2015) supersedes the 2007 edition and constitutes a technical revision.

Key Topics and Technical Requirements

The standard focuses on practical, safety-oriented guidance rather than prescriptive test methods. Major technical topics include:

• Fundamental concepts and terminology for gases, vapours, sensors and detectors, sampling and alarms.
• Properties and behaviour of flammable gases and vapours (dispersion, density, flammable limits, ventilation effects) relevant to detector placement.
• Measurement principles and sensor technologies - catalytic, thermal conductivity, infrared (IR), semiconductor, electrochemical, flame ionization (FID), photoionisation (PID) and paramagnetic oxygen detectors - with notes on common applications, limitations, interferences and poisoning.
• Selection criteria for fixed, portable and transportable detectors (gas species, detection range, response time, environmental conditions, electromagnetic immunity, intended hazardous Zone).
• Design and installation of fixed detection systems including sensor siting, open-path vs point detection, sample lines, accessibility for calibration and maintenance, redundancy and power supply considerations.
• Commissioning, use, calibration and maintenance practices to ensure ongoing reliability and safety of gas detection systems.
• Behavior of gas releases and practical considerations for buildings, enclosures and outdoor installations.

Practical Applications

IEC 60079-29-2 is intended for any application where reliable detection of flammable gases, vapours or oxygen is essential to prevent explosions, fires or asphyxiation. Typical uses:

• Process plants, petrochemical and chemical facilities
• Oil & gas production, refining and loading terminals
• Utilities, storage warehouses and tank farms
• Confined-space monitoring and ventilation control
• Underground coal mine gas monitoring (Group I)
• Emergency response and safety system design

Who Should Use This Standard

• Safety engineers and HSE managers
• Instrumentation and control system designers
• System integrators and installers of gas detectors
• Facility operators, plant managers and maintenance teams
• Test/inspection bodies and regulators
• OEMs and procurement specialists specifying detector performance

Related Standards

• IEC 60079-29-1 - performance requirements for fixed detectors for flammable gases and vapours
• IEC 60079-29-4 - requirements for open-path gas detectors
• Other parts of the IEC 60079 series covering explosive atmospheres and equipment protection concepts

IEC 60079-29-2 helps organizations select, install and maintain effective gas detectors, reducing explosion and oxygen-deficiency risks while ensuring compliance with the IEC gas-detection framework. Keywords: gas detectors, flammable gases, vapours, oxygen, selection, installation, maintenance.