L.E.L.

Abbreviation L.E.L. means "Lower Explosive Limit" or "Lower Explosive Limitation", which translates as "Lower Explosive Limit" or "Lower Explosive Limit". This value indicates the lowest concentration of flammable gas or vapor in air at which an explosion can occur in the presence of an ignition source. Below this concentration level, the gas/air mixture is too "lean" to explode. L.E.L. is expressed in percentages of the volume representation of flammable gas in a mixture with air.