Safety switches for potentially explosive atmospheres

The ATEX Directive 2014/34/EU sets the standards that are currently applicable for the preventive explosion protection design of equipment and protective systems intended for use in potentially explosive atmospheres. In April 2016, it replaced the earlier ATEX Directive 94/9/EC. All technical equipment that is a potential ignition source can trigger an explosion under certain circumstances. In order to reduce the risk of this happening, this equipment must comply with the ATEX Directive. The following prerequisites must be met for an explosion to occur: ► A potentially explosive mixture of -...

Equipment Categories Material groups groups II: All areas except Equipment categories mining (includes category and material group) Equipment groups Depending on the place of use, equipment is classified into the following groups according to the ATEX directive: ► Group I: Equipment for use in underground mining ► Group II: Equipment for all other potentially explosive The category describes the permissible application and the achieved safety level of equipment according to the ATEX directive. Equipment with equipment-related ignition sources must undergo an ignition hazard assessment to avoid...

Hazardous zones Equipment categories Area in which an explosive atmosphere comprising a mixture of air and combustible gases, vapors or mists is present continuously, for long periods or frequently. Area in which an explosive atmosphere comprising a cloud of combustible dust in the air is present continuously, for long periods or frequently. Equipment in this category is intended for use in areas in which an explosive atmosphere comprising gases (G) or dusts (D) is present continuously, for long periods or frequently. ► Requirements for the equipment Very high level of safety. The equipment remains...

Marking according to equipment characteristics ■ Marking according to standard Gases Marking for use in atmospheres with combustible gases (zones 0, 1, 2) according to EN IEC 60079-0 Explosion- protected Types of protection: Explosion i: Intrinsic safety groups: o: Oil immersion e: Increased safety ec: for equipment protection level Gc q: Powder filling p: Pressurization d: Flameproof enclosure n: Type of protection nR: Restricted breathing enclosure Temperature class: Equipment T1 to T6 protection Permissible surface level: temperature Ga/Gb/Gc Special conditions must be met (e.g. properly tightened...

The general requirements for electrical equipment are listed in the EN IEC 60079-0 standard. Classification occurs into various types of protection: The type of protection the manufacturer uses for a device (equipment) essentially depends on the device type and function, and it is included in the ATEX marking on the type label of the respective device. EUCHNER uses the following types of protection (Table 2) Explosion groups and temperature classes determine the media for which equipment may be used within the hazardous zones. The ignitability of an explosive atmosphere depends on the material....

Temperature classes Electrical equipment is classified into temperature classes T1 to T6. The temperature class relates directly to the ignition temperature of gases and dusts (temperature above which an explosive atmosphere ignites) and smoldering temperature of dusts (temperature above which a deposited dust layer begins to smolder) and thereby specifies the maximum permissible surface temperature of the equipment. The maximum surface temperature must always be less than the ignition/smoldering temperature of the explosive atmosphere in which the equipment is used. A safety clearance (maximum...

Electromechanical safety switches • optionally available O available on request - not applicable The specified data refer to the respective minimum and/or maximum values for the entire series.

• optionally available O available on request - not applicable The specified data refer to the respective minimum and/or maximum values for the entire series.

Transponder-coded safety switches © 2 pos. dr. + 2 NO © 2 pos. dr. + 2 NO © 3 pos. dr. + 1 NO Closed-circuit current principle circuit current principle Closed-circuit current principle circuit current principle Safety switches without guard locking Safety switches with guard locking with escape release Closed-circuit current principle Closed-circuit current principle Closed-circuit current principle circuit current principle 2 safety outputs (semiconductor) monitoring output OL 2 safety outputs (semiconductor) 2 safety outputs (semiconductor) 2 safety outputs (semiconductor) 1 monitoring output...

Further information Details about the various ATEX safety switches and accessories can be found on our homepage at www.euchner.com

EUCHNER GmbH + Co. KG Kohlhammerstraße 16 70771 Leinfelden-Echterdingen Germany Tel. +49 711 7597-0 [email protected] www.euchner.com 136805-07-04/25 Subject to technical modifications; no responsibility is accepted for the accuracy of this information. © EUCHNER GmbH + Co. KG · TA