What is the meaning of LEL in combustible gas alarm?

Combustible gas alarm is a very common alarm instrument in industrial places. The lower explosion limit of combustible gas is 100%LEL, so what does “LEL” mean? The following Hirep xiaobian introduces you in detail:

LEL refers to the lower explosion limit of gas. When combustible gas and combustible liquid vapor (or combustible dust) are mixed with air and reach a certain concentration, it will explode when it meets a fire source. This concentration range that can explode is called explosion limit. The lower explosive limit of each gas is different.

For example, the explosion limit of hydrogen: the lower limit is 4.0%, and the upper limit is 74.2%. When it meets air and open flame, it will burn and explode. 4.0% is the lowest volume fraction of hydrogen when it meets an open flame, which is less than this bottom line. When it meets an open flame, it will not burn and it will not explode. 74.2% is the highest limit (or upper limit) of the highest volume fraction. When the volume fraction is higher than this upper limit, it can be safely burned when it meets air and open flames, and there will be no explosion. In short, when the volume fraction is below or below the explosion limit, it will not explode when it meets an open flame.

Catalytic combustion gas alarm is used to monitor the change of combustible gas in the surrounding air from 0 to 0~100%LEL. The sensor adopts catalytic combustion technology, and the sensor can be replaced in the field. The catalytic combustion sensor has a keen response to a wide variety of flammable gases. This technology has universal applicability to combustible gases.

Catalytic combustible gas alarms are mainly used in factories, restaurants, hotels, and industrial places that emit combustible gases and vapors.

The meaning of LEL in combustible gas alarm is shared here for everyone. Therefore, when the combustible gas alarm alarms (troubleshooting), it does not mean that it will explode immediately. Measures should be taken immediately, such as ventilation and exhaust. If an explosion-proof fan is linked, it will automatically turn on.

See for more lel knowledge:

what is a safe lel level?

what does lel mean on a gas monitor?

what does lel stand for in gas detection