Atex - Uni-Valve

1 Technical da Ta - Td 01 - PAGE 35 AtexAtex markings94/9 EC product markingstypical IEC/CENELEC product markingsII2G / DcT6gasEx d eIICT6 GbCE symbolexplosion protection markingequipment groupequipment categoryexplosive atmosphere suitabilityG: gas, vapor or mist D: dustprotection metodsurface temperature classexplosion markingtype of protection explosion grouptemperature classequipment protection level (EPL-gas)dustExtIIICT80 CDbexplosion markingtype of protection explosion groupmax surface temperatureequipment protection level (EPL-dust)type of restricting enclosurefrthe explosive atmosphere is prevented from reaching the ignition source by the tight seals of the enclosureflamepfroof enclosuredan ignition inside the equipment does not propagate the external atmosphereinherentsafetyglow potential energyconstructionalsafetycIgnition hazards are eliminated by the specification of the equipmentcontrol of ignition sourcebsources of ignition are only present in the event of a malfunctionpressurisationpthe enclosure is purged with a protective gas (air)

2 And pressurised to ensure that an external atmosphere cannot re-enter the enclosureliquid immersionkThe enclosure has a suitable liquid to prevent the explosive atmosphere reaching the ignition source or to cool a hot surfaceProtection metod (94/9 EC)type of applicationflame proof enclosuredpower apparatus, switchgears motors (all devices able to ignite flammable mixtures in normal operations)powder fillingqcapacitors, electronicspressurised apparatusppower apparatus (requires special measures to maintain safety features)oil immersionotransformersencapsulationmmeas uring and control systems (avoiding hot spots on printed boards)increased safetyeterminal and connection boxes, squirrel cage motors and loghting (no incendiary or hot surfaces in normal operations)intrinsic safetyiterminal and connection boxes, data processing (small electric values)Protection metod IEC/CENELEC<< INDExTechnical da Ta - Td 01 - PAGE 36 Atexmethodsymboltype of protectionexclusionEx tDdust-excluding ignition proofExmencapsulationExtnnon-sparking (hermetically sealed devices, sealed devices and restricted breathing)Exppressurised enclosure / RoomsExqSand-filled (powder filling)explosion containmentExdflameproof enclosureenergy limitationExiintrinsic safetydilution Exvventilationavoidance of ignition sourceExeExnincreased safetynon-sparking (inherit non parking)

3 Hazardous area equipmenthazardous mixturesperiod of presence of the flammable substances94/9/ECIEC 60079-0zone classificationequipmentgroupcategoryprot ectiongroupequipment protection levelprotectionlevelgas, mist, vaporcontinuous for long periods or frequentlyzone 0II1 GIIG avery highoccasional occurrencezone 1II2 GIIG bhighnot likely, but if it does occur only rarely and for a short periodzone 2II3 GIIG cincreaseddustcontinuous for long periods or frequentlyzone 20 III1 DIIID avery highoccasional occurrencezone 21 III2 DIIID bhighnot likely, but if it does occur only rarely and for a short periodzone 22 III3 DIIID cincreasedmethaneminingIM1 IMavery highcoal dustminingIM2 IMbhighZone classification / Equipment protection levelExplosion groupexplosive atmospherestypical hazardous materialexplosion groupgases and vaporsacetylenehydrogenethylenepropaneII CIIC / IIB+H2 IIBIIA dustmetal dustcoal dustgrain dustIIICIIICIIIB fibres and flyingswood, paper or cotton processingIIIA maximum surface temperatureIEC[ C][ F]450842T1300572T22805362605002304462154 16200392T3180356165329160320135275T41202 48100212T585185T6 Temperature classification<< INDExTechnical da Ta - Td 01 - PAGE 37zonetype of atmospherepresence of explosive atmospherecategory of devices0gas (G)continuous long period120dust (D)1gas (G)occasional221dust (D)2gas (G)

4 Seldom, short periods322dust (D)Group II - non mining areasExample area zonesAtexdust areazoneszone 21zone 20zone 22zone 21zone 20gas / vapourarea zoneszone 1zone 1zone 0zone 2 The class of an entire assembled system is the one of the lowest classified categoryII 2 GDT4 T150 CII 2 GDT5II 2 GDT4 T150 CII 2 GDT4 T150 CII 3 GDT150 CII 3 GDT4 T150 CII 2GT4II 2 GDT5II 2GT4II 2GT4II 2 GdIIC T6II 2 GDIIC T4 Hazardous area equipment<< INDEx