Â· 43 comments. in Facts. An intelligence quotient, or IQ, is a score derived from one of several standardized tests designed to assess intelligence. The abbreviation âIQâ comes from the German term Intelligenz-Quotient, originally coined by psychologist William Stern.
Lower explosive limit. Lower explosive limit (LEL): The lowest concentration (percentage) of a gas or a vapor in air capable of producing a flash of fire in presence of an ignition source (arc, flame, heat). The term is considered by many safety professionals to be the same as the lower flammable limit (LFL).
5. Indicated value will be based on LEL of calibration gas. 6. If a LEL meter is used to measure combustible gas LEL other than combustible gas used for calibration, the indicated value will be lower or higher than they should be.Manufacturer usually provides LEL correlation factors to calculate the measured gas LEL based on calibration gas.. The measured value that you see on LEL meter monitor is percentage of LEL of combustible gas. Meanwhile, LEL is declared as a percentage of combustible gas concentration in the atmosphere.