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Article | REF: R2380 V2

Gas detectors. Explosimeter – toximeter – oxygenometer

Author: Véronique DEBUY

Publication date: June 10, 2025 | Lire en français

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    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...

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