Ex Ex Ex Electric actuators and valve gearboxes according to ATEX Directive 94/9/EC for use in potentially explosive atmospheres Information

Applications Explosion-proof actuators are used in industrial plants with potentially hazardous atmosphere where valve automation is required. Oil & gas : : : : : 2 | Exploration, offshore plants Refineries Distribution Gas tanks Tank farms The AUMA product range includes multi-turn, part-turn, linear, and lever actuators with a comprehensive torque and thrust range allowing automation solutions for virtually every valve application.

Explosion protection - international 4 Explosion protection in general 5 Explosion protection within AUMA 12 Actuators with fireproof housing 16 Actuators with integral controls 17 Solutions for a world in motion This brochure will provide both beginners and experts with a perfect overview of explosion protection in general and in particular its implementation within AUMA prod- ucts. It is used to determine the general suitability of devices with a potential explosion hazard. The separate data sheets and price lists must be used for detailed device definition. For more than 30 years, AUMA has...

Explosion protection - international [2] [4] [3] [1] APPROVED Ex Qualification systems from various historical developments exist worldwide. The recent years were marked by an increased effort to harmonize the national Directives. This allowed the unity of technical measures taken on the device in spite of differing classifications and terminology. [1] European Union Since July 2003, the ATEX Directive 94/9/CE has been mandatory for all explosion-proof equipment used within the European Union. This brochure takes a deeper look at this Directive. Notified testing and certification bodies are for...

Explosion protection in general What is an explosion? What is explosion protection? A flammable substance and oxygen, in a certain mixture, must be available to set off an explosion. With a suit- An explosion hazard can safely be prevented if one of the three mentioned components are successfully eliminated on site. Ignitable mixtures cannot be avoided at many installations. Therefore the occurrence of an ignition source must be prevented. able source of ignition it then leads to a chemical reaction. If the reaction velocity exceeds the acoustic velocity, this is defined as an explosion. The...

Explosion protection in general ATEX Directive 94/9/EC Classification of potentially explosive atmospheres The Directive 94/9/EC is the European Directive for equipment in potentially explosive atmospheres. It defines the general protection objectives (protection of persons and property). Exact knowledge of the conditions under which the devices are to be operated is important for the selection of the electrical equipment. The description is designated by the following terms: One of the most significant differences to the previous regulation is that non-electrical equipment has to be certified...

Zone/equipment category Explosion group/temperature class Potentially explosive areas are divided into zones according to the presence of potentially explosive atmospheres. The gases are classified into explosion groups and temperature classes according to their hazardous level. The classification into equipment categories was introduced with the ATEX Directive 94/9/EC. It marks the equipment approved for the use in the respective zone. The temperature class defines the permissible maximum surface temperature of the equipment. Zones 0, 1, and 2 apply to explosive atmospheres consisting of gases...

Explosion protection in general How to achieve explosion protection? There are different possibilities to qualify electrical equipment and non-electrical equipment for the use in potentially explosive atmospheres. These measures are called protection types. They are described in the European Standards EN 50014 et seqq. for electrical equipment and EN 13463-1 et seqq. for non-electrical equipment. Explosion-proof AUMA actuators are designed to protection types “Increased safety” (EEx e) “Flameproof enclosure” (EEx d), and “Constructional safety” (c). The protection type “Constructional safety”...

Flameproof enclosure (EEx d) Constructional safety (c) The protection type “Flameproof enclosure” allows an explosion inside the electrical equipment. Flameproof joints of housing parts are designed in such a way that a flame or burning particles cannot reach the outside. This is achieved by accurate sizing of the gaps and widths of the flameproof joints. The housing is of a rigid design so that it can withstand the pressure developing during an internal explosion without damage. This type of protection applies to non-electrical equipment or non-electrical parts of electrical equipment. It was...

Explosion protection in general Who tests what? Electrical equipment The conformity assessment of the electrical equipment for equipment categories 1 and 2 has to be performed by notified European bodies. AUMA actuators are mainly tested and approved by the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, Germany. In addition to the assessment of the explosion protection measures for the electrical equipment, the in-house quality assurance and production are regularly audited by the PTB. AUMA explosion-proof devices are subjected to a 100 % test, i.e. a pressure test and a dimension...

Marking All essential information, from the explosion group to the type of protection and the number of the EC-type-examination certificate, must be included in the equipment marking. In addition to the name plate, an approval plate is fixed to the actuator. This contains all information regarding the explosion protection. [1] [2] [3] [4] [1] Approved mark of the applicable standard here: CENELEC (responsible for the EU) [2] Explosion protection classification electrical explosion protection [a] [c] [b] [e] [g] [d] [f] [h] [a] Equipment group (mining industry I, other areas II) [b] Category 2...