How to convert LEL to PPM on a gas meter

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How to convert LEL to PPM on a gas meter
Gas meters have a lower explosive limit. (Comstock/Stockbyte/Getty Images)

LEL stands for the lower explosive limit of a gas. It is the minimal concentration of the gas required for the gas to ignite. It is normally expressed as a percentage of the total air. PPM stands for parts per million. It also is a measure of concentration, though it is often provided by gas meters.

Skill level:


  1. 1

    Multiply the LEL percentage number by 10,000 to get PPM.

  2. 2

    To convert from PPM to an LEL percentage, divide the PPM by 10,000.

  3. 3

    For example, ethylene has an LEL of 2.7 per cent. Multiplying this by 10,000 gives 27,000 PPM as the lower explosive limit, as it would be displayed on a gas meter.

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