I work in a refinery and am required to wear a 4 gas monitor. One thing it measures are LELs.
What is LEL, you may ask? LEL stands for “Lower Explosive Limit” and is the lowest concentration of a particular gas that has the potential to be flammable or combustible. In other words, it’s the minimum amount of gas that will catch fire or explode when an ignition source is present. If a gas concentration is less than the lower limit, there is insufficient gas for the mixture to ignite.
A couple weeks ago while sitting at my desk, I cut a large SBD (silent but deadly) and it set off my gas monitor in full alarm. Everyone in the office now knew what I had done.
I consider that as a high point in my now declining career.
