Combustible gas detectors are ones of the basic safety equipments required when there is combustible gas inside the plant site. Auto-ignition temperature and Lower Explosive Limit (LEL) describe the potential dangers of combustible gases. Auto-ignition temperature is the lowest temperature at which combustible gas could be ignited spontaneously (self-sustained combustion), without the presence of source of ignition. Meanwhile, Lower Explosive Limit or LEL is the lowest concentration of combustible gas in the air that will propagate flame when exposed to a source of ignition.
Electricity is the set of physical phenomena associated with the presence and flow of electric charge. Electricity gives a wide variety of well-known effects, such as lightning, static electricity, electromagnetic induction and electrical current. In addition, electricity permits the creation and reception of electromagnetic radiation such as radio waves.
In electricity, charges produce electromagnetic fields which act on other charges. Electricity occurs due to several types of physics: