A spark plug is a simple, but important component of the system that allows instantaneous ignition of a burner in cooking hobs, built-in ovens and free-standing cookers. Moreover, in addition to the traditional functions, it can be exploited, combined with an electronic card, as a flame detector device too, especially on top-of-the-range hobs, in which it re-ignites the flame in case of unintentional switching-off.