The classification of the burners is not unique; in fact there are many classification criteria, such as the power, the structure, the type of fuel used, which can be solid, liquid or gaseous.
In industrial burners a series of measures are adopted in order to obtain adequate safety standards during operation. In particular, the control electronics perform a series of checks during the ignition cycle and during combustion.
In industrial burners the combustion triggering is not carried out with an electrode, but with another burner, which is called "pilot burner". It has no function for the purposes of the process but its flame serves only to light the main burner and to fuel the combustion. Usually the pilot is first turned on (obviously equipped with a metal ignition electrode), the flame is detected, and, if present, the fuel is introduced after a few seconds and the main burner ignites.