本欧洲标准涉及使用易燃清洁液体或清洁液混合物的工业物品（称为“清洁机器”）在表面清洁和预处理中的重大危害，即使是乳液形式也可能产生，甚至暂时的可燃性条件。 本欧洲标准适用于EN 12921-1。这两个部分一起使用液体或蒸气的工业物品的清洁机器，在制造商预期使用的条件下（见第4条），可以涵盖与清洁机相关的所有重大危险。本欧洲标准中规定的具体要求优先于EN 12921-1的各自要求。 在本文件的范围内，术语可燃材料和易燃物质和爆炸物等同使用。 注1:只有当流体的分子与空气中的氧气紧密接触时，才能产生可​​燃性条件。当以下情况发生点火:流体在空气中产生蒸汽浓度，或者:易燃液体以细小液滴悬浮在空气中（气溶胶）的形式存在。 注2:在实践中，火灾和爆炸与反应的大小和强度以及速溶剂不同

This European Standard deals with the significant hazards of machines for surface cleaning and pre-treatment - in the following called "cleaning machines" - of industrial items using flammable cleaning liquids or a mixture of cleaning liquids, even in emulsion form, which can potentially create, even temporarily, a condition of flammability. This European Standard applies in combination with EN 12921-1. Both parts together cover all significant hazards relevant for cleaning machines of industrial items using liquids or vapours, when they are used as intended and under the conditions foreseen by the manufacturer (see Clause 4). The specific requirements specified in this European Standard take precedence over the respective requirements of EN 12921-1. To the extent of this document the terms combustible materials and flammable substance and explosive are equivalently used. NOTE 1 The condition of flammability can be generated only when molecules of the fluid are in intimate contact with oxygen from the air. Ignition is possible when: the fluid generates a concentration of vapour in air, or: the flammable fluid is present as a suspension of fine droplets in air (aerosol). NOTE 2 In practice, fires and explosions differ by the size and intensity of the reaction, and by the instantaneous effects on the environment. This European Standard does not apply to machinery and related equipment excluded from the scope of EN 12921-1. This European Standard is not applicable to cleaning machines of industrial items using flammable cleaning liquids which are manufactured before the publication of this European Standard by CEN.