Jan 24, 2020LEL stands for "Lower Explosive Limit" and is the lowest percentage concentration of a particular gas that has the potential to be flammable. Most gases have a lower explosive limit (LEL) and an upper explosive limit (UEL). Below the lower limit, there is insufficient gas for the mixture to ignite.
[email protected]6.2.1.1 Alternative Number 1. Use rotameters to inject into the system's sample probe equal flow rates of a mixture of the upper range NO oxide calibration gas and the NO2 calibration gas having a concentration that is 50 percent (+/-10 percent) of the NO calibration gas, or …
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