4. Characteristics and influencing factors

4.1 Some theoretical elements

Most gas detection methods rely on the interaction between a gaseous medium and a solid (or liquid, in the case of electrochemistry). The gas to be detected must therefore come into contact with the solid: to do this, it must pass through a number of media protecting the sensitive element. The detection head assembly, as seen previously, comprises a filter, a sinter, a free space, and finally the sensitive element on which the gas will react, after adsorption (example figure 7 ). The species formed by the reaction then desorb and diffuse into the open air, crossing the previous barriers...

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Characteristics and influencing factors

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Installation, selection and maintenance of fixed detectors

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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