Gas concentration have mass concentration and the volume concentration of two kinds of representation. Gas detection instrument is measuring the volume of a gas concentration, commonly used Vol %, PPM and % LEL as concentration detection unit.
Vol % is the percentage volume unit, the PPM is PPM volume unit. The conversion relationship between the two is:
1% Vol = 104 PPM
% LEL is the concentration of combustible gas commonly used unit, the volume concentration of combustible gas explosion lower limit (usually expressed in Vol %) one hundred divisions, each corresponding is 1% LEL. Such as the lower explosive limit of 5% vo l methane, the methane 100% LEL = 5% Vol.
In addition, mg/m3 is also a kind of common gas concentration unit, it is the mass concentration. Can convert each other between mg/m3 and PPM, formula is as follows:
1 mg/m3 = 22.4 * 1 PPM * M / 273 / (273 + T] [Ba / 101325], which is suitable for gas molecular weight M, T is temperature, Ba for pressure.
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