All those areas where flammable and hazardous materials are processed (oil and fuel refineries, offshore drilling platforms, paint and varnish chemical industries etc.) and considered potentially explosive atmosphere and require special caution. For these specific employments, Eltra has developed several lines of incremental and absolute explosion-proof encoders, which comply with the ATEX standard (according to the directive 94/9/EC, in matter of equipment and protective systems intended for use in potentially explosive atmospheres) and guarantee at the same time an optimal resolution and output frequency for a high precision on speed and position control.