1. Definitions

The definitions given below have been drawn up by an international commission (source: IEC Electropedia, also known as IEV online) or defined in international (IEC) and European (EN) standards for the evaluation of flammable, oxygen and toxic gas detectors. Additional information is provided in the form of comments.

Explosive gas atmosphere

Mixture of flammable substances in gas or vapor form with air, which, under atmospheric conditions and after ignition, allows self-sustained propagation.
Lower explosive limit, LEL

Concentration of flammable gases and vapors in air, below which an explosive gaseous atmosphere will not form.
Upper explosive limit, UEL

Concentration of flammable gases, vapors...

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Definitions

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page Gas detectors. Explosimeter – toximeter – oxygenometer

Detection principles

Bibliography

(1) - DRÄGER - Livre de poche Tubes Réactifs Dräger & MicroTubes - (2022). PDF disponible en ligne https://www.draeger.com/Content/Documents/Products/tubes-hb-9092086-fr.pdf
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Standards and norms

Electrical oxygen detection and measurement devices – Fitness-for-purpose requirements and test methods. - NF EN 50104 - 2019
Electrical equipment for the detection of flammable gases in domestic premises – Part 1: Test methods and suitability requirements - NF EN 50194-1 - 2023
Electrical equipment for combustible gas detection in domestic premises – Part 2: Electrical equipment for continuous operation...

Regulations

ATEX Directive 2014/34/EU 2014 Applies in the same way as Directive 94/9/EC to equipment and protective systems intended for use in potentially explosive atmospheres.

Directive 98/24/EC 1998 Concerning the protection of the health and safety of workers from the risks related to chemical agents at work (14th individual Directive within the meaning of Article 16(1) of Directive 89/391/EEC)

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