The "X" suffix is perhaps the most important part of this code for an onsite technician. It signals that the general ATEX rules are not enough for this specific device. Common "special conditions" found in such schedules might involve:
: It ensures that the equipment complies with the relevant Atex directives and is suitable for use in potentially explosive atmospheres within the European Union. lcie 13 atex 3069 x
The device is built with Flameproof "d" protection to contain internal explosions and Protection by Enclosure "tb" to prevent dust ignition. The "X" suffix is perhaps the most important