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Combustible, Explosive, or Toxic Gas Detection Gas detection standards provide guidance on the selection, installation, use, and maintenance of hazardous gas detectors. Detectors signal when concentrations of toxic, or combustible gases reach unacceptable levels. The independent watchdog group and regulator, HSE, in Great Britain, has published a guide for The Selection and Use of Flammable Gas Detectors and the gas monitoring equipment supplier, RKI Instruments has a series of application briefs for gas detection in specific applications (ANSI is not responsible for content on external websites).

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ANSI/ISA 12.13.01-2013
Explosive Atmospheres - Part 29-1: Gas detectors - Performance requirements of detectors for flammable gases
This part of ANSI/ISA-60079-29 specifies general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed apparatus for the detection and measurement of flammable gas or vapour concentrations with air. The apparatus, or parts thereof, are intended for use in explosive gas atmospheres (see 3.1.3) and in mines susceptible to firedamp.

ANSI/ISA 12.13.02-2012
Explosive Atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen
This part of ISA-60079-29 gives guidance on, and recommended practice for, the selection, installation, use and maintenance of electrically operated group II apparatus intended for use in industrial and commercial safety applications for the detection and measurement of flammable gases complying with the requirements of ISA-60079-29-1 and ANSI/ISA-12.13.04.

ANSI/ISA TR12.13.03-2009
Guide for Combustible Gas Detection as a Method of Protection
Combustible gas detection used for process safety management may also be used to provide protection from explosion or fires by minimizing the possibility of an accumulation of combustible gases reaching ignitable levels. Criteria are developed to establish combustible gas levels to initiate alarms, initiate increase in ventilation rates and to initiate shutdown of processes to shutoff the flow of combustible gas that has breached containment. It is the intent of this document to compile and refine techniques for the use of combustible gas sensors and controllers to monitor and control sources of combustible gas release into the atmosphere within designated spaces. It is also the intent that these products and techniques be adapted by industries and used with processes that have historically not employed combustible gas detection as a method of protection.

BS EN 50402:2005+A1:2008
Electrical apparatus for the detection and measurement of combustible or toxic gases or vapours or of oxygen. Requirements on the functional safety of fixed gas detection systems (British Standard)

This standard is also available from: ON


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