Nowadays, we can see gas detectors everywhere in petrochemical, chemical manufacturing, pharmaceutical microbiology and other industries, whether it is to detect gas concentration or gas composition, or to detect gas micro-leakage, 1 easy-to-use gas detector can provide a safe environment for our production and life. However, when we use the gas detector in our daily life, the detection range of the liquid crystal label of the gas detector often appears in the words similar to 0-100LEL. So do you know what Gas Detector LEL means? The following is a brief introduction by yi yun Tian:

LEL in gas detector actually refers to the concentration value of gas alarm.

The lowest content of combustible gas that can cause an explosion is called the lower explosive limit Low Explosion - Level(LEL).

LEL is not a unit, it refers to a numerical value, generally refers to the volume ratio of explosive gas in the air. LEL this value is not detected by the instrument, it is the national standard for different gases have different values. The data displayed by the gas detection instrument only indicates the concentration of combustible gas in the air to make an alarm. Generally, there is a mark on the quantitative analysis instrument to detect what gas. If it is a qualitative analysis instrument, it cannot show what kind of gas it is.

when the concentration of combustible gas in the air reaches its lower explosion limit, we call the explosion risk of the combustible gas environment in this place 100%, I .e. 100 LEL. If the content of combustible gas only reaches 10% of its lower explosion limit, we call the explosion risk of combustible gas environment in this place 10% LEL; The monitoring of combustible gas in ambient air often directly gives the risk of combustible gas environment, that is, the content of combustible gas in air and the percentage of its lower explosion limit are expressed:[%LEL]

In other words, when the detector value reaches the "100%LEL" alarm point, it is equivalent to the methane content at this time being "5%" volume ratio. When the value of the combustible gas detector reaches the "25% LEL" alarm point, it is equivalent to the "1.25%" volume ratio of methane at this time. However, you don't have to worry about whether there will be danger at any time after the combustible gas detector alarms, it is still a certain distance from reaching the explosion. Take appropriate measures immediately, such as opening the exhaust fan or cutting off some valves or opening the spray system, the danger of explosion will not appear.There is still a big gap from the lower explosion limit where danger is really possible to give an alarm, so that it will play the role of alarm prompt.