2. Detection principles

Measuring the concentration of a gas (or vapour) is based on its physical or chemical properties, usually the property that is particularly sensitive to the presence and variation of the concentration of this gas, or specific to this gas.

For example, oxygen is a paramagnetic gas, and some detectors use this property to measure oxygen concentration.

The main properties used in commercial devices are :
- physical properties :
  - thermal conductivity,
  - absorption of light radiation,
  - adsorption on a material,
  - sound level of an ultrasonic leak ;
- chemical...

You do not have access to this resource.

Exclusive to subscribers. 97% yet to be discovered!

You do not have access to this resource.
Click here to request your free trial access!

Already subscribed? Log in!

The Ultimate Scientific and Technical Reference

A Comprehensive Knowledge Base, with over 1,200 authors and 100 scientific advisors

+ More than 10,000 articles and 1,000 how-to sheets, over 800 new or updated articles every year

From design to prototyping, right through to industrialization, the reference for securing the development of your industrial projects

This article is included in

Physical measurements

This offer includes:

Knowledge Base

Updated and enriched with articles validated by our scientific committees

Services

A set of exclusive tools to complement the resources

Practical Path

Operational and didactic, to guarantee the acquisition of transversal skills

Doc & Quiz

Interactive articles with quizzes, for constructive reading

Subscribe now!

Ongoing reading
Detection principles

Previous
page Definitions

Construction of the various devices

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
...

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)

...