When the concentration of combustible gas in the air reaches its lower explosion limit, we call the explosion risk of the combustible gas environment in this place as 100%, that is, 100% LEL. If the content of combustible gas only reaches 10% of its lower explosion limit, we call the explosion risk of the combustible gas environment at this place as 10% LEL; the monitoring of combustible gas in the ambient air often directly gives the risk of combustible gas environment. Degree, that is, the percentage of the content of the combustible gas in the air to its lower explosive limit: [%LEL]
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