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Meaning for PPM, %LEL and %VOL
1. PPM: Refers to the one in a million.
Generally refers to the high precision products.
For gas detection, normally it is a toxic gas, such as carbon monoxide, general detection range is 0-1000ppm, chlorine gas is 0-50ppm etc.
2. %LEL: Refers to the low explosion limit.
The combustible gas easily explode when reaches 100%LEL
So 0-100%LEL generally refers to the measurement range of combustible gas.
3. %VOL: Refers to the volume ratio.
Generally refers to the oxygen, combustible gas.
For example, how much oxygen exsits in a space.
Oxygen is very important especially in the hospital.
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