Need help with fixed combustible gas alarms?
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I would like to ask the forum members: is the percentage displayed on the fixed alarm device the concentration of the premixed gas? (Unit of explosive limit: %)
When asking a question, you need to specify all the operating conditions – premixed gas? What device? What gas? That unit is expressed as a percentage of LEL; take another look at the unit – it should be %LEL.
This issue should be raised in the dashboard forum. The lowest concentration at which a combustible gas will explode when exposed to an open flame in air is the lower explosive limit – LEL. There is also an upper explosive limit. Generally, we refer to the lower limit of explosion control. Fixed combustible gas alarms are classified into two alarm levels in accordance with GB50493-2021: the first level is set at 25% LEL, and the second level at 50% LEL. LEL is not a unit but rather a value, which generally refers to the volume percentage of explosive gases in the air.