This European Standard contains requirements, test and assessment methods, marking, labelling and packaging applicable to overfill prevention devices without a closure device. The overfill prevention device without a closure device is usually composed of — overfill prevention sensor consists of — sensor, — electrical interface, — mechanical interface, — overfill prevention controller according to EN 16657. These overfill prevention devices are intended to be used in/with underground or above ground, non-pressurized, static tanks designed for liquid fuels. NOTE 1 Liquid fuel means liquids for internal combustion engines, heating/cooling boilers and generators. NOTE 2 In further text, for liquid fuels the term liquid is used.