As we all know, under normal circumstances, the gases that can be detected by the four-in-one gas detector include: H2S, hydrogen sulfide, CO, carbon monoxide, O2, and EX combustible gas. However, in the process of practical application, some friends found that there is no "EX" mark in some four-in-one gas detectors, but the "EX" mark will be seen on the label of explosion-proof electrical equipment, such as combustible gas detectors. What does "EX" mean on 4-in -1 gas detector ? The following is a brief introduction by yi yun Tian:

the" EX "on the four-in-one gas detector mainly refers to the lower explosive limit and is mainly used to measure combustible gas.

EX is expressed as combustible gas in gas, such as methane, acetylene, biogas, oil and gas, and ethanol.

If there is Ex on the label on the shell or package, it does represent explosion-proof. However, if it is displayed on the display screen, it means combustible gas, that is, combustible and explosive gas, and correspondingly, there will generally be% LEL lower explosive limit percentage as the unit of measurement.

because EX is expressed as combustible gas in gas, such as flammable and explosive methane, acetylene, biogas, oil and gas, ethanol gas, etc. (the concentration of flammable gas in air is dangerous to reach the lower explosion limit of explosive mixture). Therefore, the EX displayed on the label of some combustible gas detectors is the abbreviation of the English name of the detected combustible gas. The EX shown on the product housing package indicates that the equipment is explosion-proof.

and for some specific environments such as mines, underground, dust environment will not produce sparks and conductivity of equipment, thus causing gas explosion. The four-in-one gas detector shows the percentage of combustible gas per 1 cubic meters in the measured environment.