Hazardous gas detection systems
We come into contact with gases in virtually every environment – from domestic gas installations to industrial gases. The air that we breathe contains 21% O2, 78% N2 and other components. These components may be of natural or artificial origin. In certain situations, the level of contaminants may be sufficiently high to pose a risk to living organisms. Therefore, it is necessary to use devices for their detection and measurement.
Division of volatile substances:
- gases – gaseous state under normal conditions,
- vapour – evaporated part of liquid substances,
For our purposes, gases can also be classified as follows:
- flammable gases – we measure them for fire-extinguishing reasons,
- toxic gases – we measure them for health and safety reasons (poisonous or oxygen-displacing),
- measurements for technological reasons.
Summary of the most important definitions related to gasometry:
- potentially explosive atmospheres: Space in which explosive gas atmospheres may occur (there is a potential hazard).
- explosive gas atmosphere: Mixture of combustible substances in the form of gas, vapour or mist with air under atmospheric conditions in which, when ignited, the combustion spreads over the entire unburned mixture.
- lower explosive limit (LEL): Volumetric concentration of a combustible gas or vapour in the air below which no explosive gas atmosphere may be expected to occur.
- upper explosive limit (UEL): Volumetric concentration of a flammable gas or vapour in the air above which no explosive gas atmosphere may be expected to occur.
- self-ignition temperature of an explosive gas atmosphere: The lowest heated surface temperature at which, under the conditions laid down in accordance with IEC 79-4, flammable substances may ignite in the form of a mixture of gas, vapour or mist and air.
- explosion proof enclosure type: Specific countermeasures applied to electrical equipment to avoid ignition of the surrounding explosive gas atmosphere.
- occupational exposure limit (OEL): The weighted average value of concentration, the impact of which, on an employee during an 8-hour daily and average weekly working time specified in the Labour Code, during his/her professional activity, should not cause negative changes in his/her health condition and in the health condition of future generations.
- short-term exposure limit (STEL): Average concentration value that should not cause adverse effects on workers' health if it occurs in the working environment for no more than 15 minutes and no more than twice during a shift, with an interval of no less than one hour.
- ceiling exposure limit (C): A concentration value which, due to risk to the health or life of a worker, may not be exceeded at any time in the working environment.
The implementation of projects usually takes place from the initial design phases through delivery, installation, commissioning to post-warranty services.