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Atex RefeRence Guide

This Hoffman ATEX Reference Guide explains European hazardous location protection methods and markings.

PROTECTION METHODS

Protection Method IEC

PROTECTION CONCEPTS

Protection Concepts Symbol How it Works Category

TEMPERATURE CLASSES Ex e Ex nA Ex d Ex nW Ex q Ex ia Ex ib Ex nL Ex p Ex nP Ex m Ex o Ex nR Ex s No arcs, sparks or hot surfaces Contain the explosion and quench flame Limit energy of sparks; limit the temperature Keep the flammable gas away from any hot surfaces and ignition capable equipment Any proven method 2&3 3 2&3 3 2&3 1, 2 & 3 2&3 3 2&3 3 2&3 2&3 3 1, 2 & 3

Max. Surface Temperature Fahrenheit T-Class

Intrinsic Safety Intrinsic Safety Flameproof Pressurization Increased Safety Encapsulation Oil Immersion Powder Filling Non-sparking General Requirement Inspection & Maintenance

ia ib d p e m o q n

60079-11 60079-11 60079-1 60079-2 60079-7 60079-18 60079-6 60079-5 60079-15 60079-0 60079-17

Increased Safety Non-sparking Flameproof Enclosed Break* Quartz/Sand Filled Intrinsic Safety Energy Limitation Pressurized Simplified Pressurization Encapsulation Oil Immersion Restricted Breathing Special

450° C 300° C 200° C 135° C 100° C 85° C

(842° F) (572° F) (392° F) (275° F) (212° F) (185° F)

T1 T2 T3 T4 T5 T6*

*Enclosed Break can also be noted as Ex nC

Fire Triangle

Flammable/ Combustible Substance Air/Oxygen

ATEX MARKING DIRECTIVE (94/9/EC) EX II 2 G D DUST GAS EQUIPMENT CATEGORY EQUIPMENT GROUP EUROPEAN EXPLOSIVE ATMOSPHERE SYMBOL EEx e II T6 TEMPERATURE CLASS GAS GROUP PROTECTION METHOD EUROPEAN EXPLOSIVE ATMOSPHERE PROTECTION CONCEPT

Ignition Source

ATEX

GAS GROUPS

Typical Material

All three elements of the fire triangle must be present for ignition to occur.

MODULES [ATEX (94/9/EC)] [ANNEX I (1)] Classification of Equipment Groups into Categories

Equipment shall be classified into the following categories Equipment Group: Equipment Category: Atmosphere: Protection Level: Required Protection Performance & Operation:

Methane Propane Ethylene Hydrogen Acetylene All Gases

I IIA IIB IIC IIC II

I (Mines) I (Mines) II (Above Ground) II (Above Ground) II (Above Ground)

M1 M2 1 2 3

Methane & Dust Methane & Dust Gas, Vapor, Mist, Dust Gas, Vapor, Mist, Dust Gas, Vapor, Mist, Dust

Very High High Very High High Low

Two faults, remain energized and functioning Severe normal operation, De-energize in exp. atm. Two faults One fault Normal operation

Highlighted items represent protection provided by Hoffman ZonEXTM Enclosures, certified to meet ATEX Directive 94/9/EC, EX II 2 G D, EEx e II, IP66 *Applies to component populated Hoffman ZonEXTM Enclosures only.

COMPARING DIVISIONS, ZONES, & CATEGORIES

Frequency of Occurrence CEC, NEC Editions Division System Zone System Class I, CEC, NEC Category System ATEX

Continuous Intermittent Periodically Abnormal Condition Class I, Division 1 Class II, Division 1 Class I, Division 2 Class II, Division 2

Zone 0, 20 Zone 1, 21 Zone 2, 22

Category 1 Category 2 Category 3

Zones and Divisions

Vent

Div 2 Zone 2

INGRESS PROTECTION (IP) CODES

First Number1 Second Number1

0 1 2 3 4 5 6

No Protection Objects Greater than 50mm Objects Greater than 12mm Objects Greater than 2.5mm Objects Greater than 1mm Dust Protected Dust Tight

0 1 2 3 4 5 6 7 8

No Protection Vertically Dripping Water 75° to 90° F Dripping Water Sprayed Water Splashed Water Water Jets Powerful Water Jets Effects of Immersion Indefinite Immersion

Div 1 Zone 0 Flammable Liquid or Dust

Div 1 Zone 1

Enclosure Types

Enclosure Type 2,3 Intended Use

1 2 3 3R 3S 4 4X 5 6 6P 7 8 9 10 12 12K 13 Note:

1 2 3

Indoor use, limited amounts of falling dirt Indoor use, limited amounts of falling water and dirt Outdoor use, rain, sleet, wind blown dust, external formation of ice Outdoor use, rain, sleet, external formation of ice Outdoor use, rain, sleet, wind blown dust, external mechanisms operable when ice laden Indoor or outdoor use, wind blown dust and rain, splashing water, hose directed water, external formation of ice Indoor or outdoor use, wind blown dust and rain, splashing water, hose directed water, corrosion, external formation of ice Indoor use, settling airborne dust, falling dirt, non-corrosive liquids Indoor or outdoor use, hose directed water, temporary submersion, external formation of ice Indoor or outdoor use, hose directed water, prolonged submersion, external formation of ice Indoor use, Class I, Division 1, Groups A, B, C, and D hazardous locations, air-break equipment Indoor use, Class I, Division 1, Groups A, B, C, and D hazardous locations, oil-immersed equipment Indoor use, Class II, Division 1 Groups E, F, and G hazardous locations, air-break equipment Mining applications Indoor use, circulating dust, falling dirt, dripping noncorrosive liquids Indoor use, circulating dust, falling dirt, dripping noncorrosive liquids, provided with knockouts Indoor use, lint, dust, spraying of water, oil, and noncorrosive coolant

Numbers can be replaced by 'X' when the characteristic number is not required Enclosure Types for US only Enclosure Type can be converted to IP code rating; however, IP classified enclosures cannot be converted to Enclosure Type

© 2007 Hoffman Enclosures Inc. Tech-00057

HoffmAn uSA

2100 Hoffman Way Anoka, Minnesota 55303-1745 U.S.A. Tel: 763-421-2240 Fax: 763-422-2178 Customer Service: 763-422-2211 http://www.hoffmanonline.com

canada

111 Grangeway Avenue, Suite 504 Scarborough, Ontario M1H 3E9 Tel: 416-289-2770 Fax: 416-289-2883 1-800-668-2500 (Canada only)

mexico

Hoffman Enclosures Mexico, S. de R. L. de C. V. Arquimedes No. 33 Piso 1 Col. Palmas Polanco Mexico, DF CP 11560 Tel: (55) 5280-1596 Fax: (55) 5280-8827 / 5280-8167

for additional international locations, see www.hoffmanonline.com

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