Process Engineering Division – Instrumentation and Automation Section – Daily Question – Question dated 2020-08-28

“LEL” refers to the lower explosive limit, which is a technical term used for flammable gases. The lowest concentration of a combustible gas in air at which it explodes when exposed to an ignition source is called the lower explosive limit—abbreviated as “LEL”. When the concentration of flammable gases in the air reaches its lower explosive limit, we say that the explosion hazard in that area is 100%, or 100% LEL. If the concentration of combustible gas reaches only 10 percent of its lower explosive limit, we refer to the explosion hazard level of the combustible gas environment in that location as 10% LEL ； The monitoring of combustible gases in ambient air often directly provides an indication of the environmental hazard posed by those gases, expressed as a percentage of the concentration of the gas in the air relative to its lower explosive limit ； Therefore, this type of monitoring is sometimes also referred to as “detonation detection,” and the instruments used for it are called “detonation detectors.” Generally, the low explosion value is set at 25% and the high explosion value at 50%.

“LEL” refers to the lower explosive limit, which is a technical term used for flammable gases. The lowest concentration of a combustible gas in air at which it explodes when exposed to an ignition source is called the lower explosive limit—abbreviated as “LEL”. When the concentration of flammable gases in the air reaches its lower explosive limit, we say that the explosion hazard in that area is 100%, or 100% LEL. If the concentration of combustible gas reaches only 10 percent of its lower explosive limit, we refer to the explosion hazard level of the combustible gas environment in that location as 10% LEL ； The monitoring of combustible gases in ambient air often directly provides an indication of the environmental hazard posed by those gases, expressed as a percentage of the concentration of the gas in the air relative to its lower explosive limit ； Therefore, this type of monitoring is sometimes also referred to as “detonation detection,” and the instruments used for it are called “detonation detectors.” Generally, the low explosion value is set at 25% and the high explosion value at 50%.

The lowest concentration of a flammable gas that can cause an explosion is known as the Lower Explosion Level (LEL)

“LEL” refers to the lower explosive limit, which is a technical term used for flammable gases. The lowest concentration of a combustible gas in air at which it explodes when exposed to an ignition source is called the lower explosive limit—abbreviated as “LEL”.

“LEL” refers to the lower explosive limit, which is a technical term used for flammable gases. The lowest concentration of a combustible gas in air at which it explodes when exposed to an ignition source is called the lower explosive limit—abbreviated as “LEL”.

Lower Explosive Limit, the minimum level at which an explosion can occur.

“LEL” refers to the lower explosive limit, which is a technical term used for flammable gases. The lowest concentration of a combustible gas in air at which it explodes when exposed to an ignition source is called the lower explosive limit—abbreviated as “LEL”.

Lower explosive concentration limit. Finally, I’ve come across a simple question that I can answer. As a newcomer, I really like the “One Question per Day” section; it’s great for learning.

“LEL” refers to the lower explosive limit, which is a technical term used for flammable gases. The lowest concentration of a combustible gas in air at which it explodes when exposed to an ignition source is called the lower explosive limit—abbreviated as “LEL”. When the concentration of flammable gases in the air reaches its lower explosive limit, we say that the explosion hazard in that area is 100%, or 100% LEL. If the concentration of combustible gas reaches only 10 percent of its lower explosive limit, we refer to the explosion hazard level of the combustible gas environment in that location as 10% LEL ； The monitoring of combustible gases in ambient air often directly provides an indication of the environmental hazard posed by those gases, expressed as a percentage of the concentration of the gas in the air relative to its lower explosive limit ； Therefore, this type of monitoring is sometimes also referred to as “detonation detection,” and the instruments used for it are called “detonation detectors.” Generally, the low explosion value is set at 25% and the high explosion value at 50%.