Cts has made the certification of its free wheels according to Directive 94/9/CE about partially explosive atmosphere classified as "zone 22". Free wheels haven't be modified but we have set a usage limit about idle rotation speed in order to maintain the maximum working temperature within a specific value. The type of applied marking on the free wheels is the same of the photo and it's included the manufacturer name, the code of the free wheel and the reference to the Directive. Regarding the necessary documentation ( certification and mounting instructions) its distribution is associated to the item sale. Please contact us for defining the right use of free wheels in ATEX environment.