ATEX directives for products used in potentially explosive atmospheres

Explanation of ATEX Markings

ATEX is derived from ATmosphères EXplosibles and refers to the EU directive 2014/34/EU, which deals with equipment and protective systems used in potentially explosive atmospheres. The objectives are to prevent hazards and protect the health and safety of persons using these devices and protective systems.

Up-to-date ATEX markings help you to quickly and conveniently catch up on the various applications, protection concepts, equipment groups, and temperature classes of our ATEX load cells.

ATEX Directive 2014/34/EU

In April 2016, the European Commission published the ATEX Directive 2014/34/EU, which replaced Directive 94/9/EC.

It meant little change for the manufacturers of explosion-protected equipment, as the essential health and safety requirements for explosion-protected equipment remain unchanged and all certificates issued under the old ATEX Directive 94/9/EC remain valid without any further changes. The harmonised EN600xx standards will also continue to apply under the new Directive and the conformity assessment procedures will remain the same.

Extended Scope

The ATEX Directive 2014/34/EU extends the circle of economic operators by clarifying the concept of ‚making available on the market’. Besides ‚manufacturers’ or those ‚placing a product on the market’, the new definition also refers to importers and distributors, as well as to all operators who manufacture explosion-protected equipment from components or sub-assemblies for their companies.

ATEX markings at a glance

As components such as sensors and load cells are also covered by the ATEX directive, we would like to give you an overview of the various markings on this page. Based on the current ATEX markings, you can quickly and conveniently find information on the respective application areas, safety concepts, equipment groups and temperature classes.

Download the ATEX poster (PDF) download

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Equipment category and equipment protection level (EPL)
Groups
Electronic devices
Temperature classification
Zones
Types of protection for electrical equipment in explosive atmospheres

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EQUIPMENT CATEGORY AND EQUIPMENT PROTECTION LEVEL
Acc. to EU directive 2014/34/EU (ATEX)		Acc. to IEC and CENELEC
Equipment group	Equipment category	EPL	Adequate safety
Underground parts of mines likely to be endangered by firedamp
I	M1	Ma	With rare errors
I	M2	Mb	Until the device is turned off
Explosive gas atmospheres
II	1G	Ga	Zone 0 With rare errors
II	2G	Gb	Zone 1 With foreseeable errors
II	3G	Gc	Zone 2 In normal operation
Atmospheres with combustible dust
II	1D	Da	Zone 20 With rare errors
II	2D	Db	Zone 21 With foreseeable errors
II	3D	Dc	Zone 22 In normal operation
_{(1)G Related electrical equipment – installation in the safe area}

GROUPS
IEC / CENELEC / NEC 505 / NEC 506		NEC 500
Group I	Underground parts of mines likely to be endangered by firedamp		-
	Methane
Group II Subgroups	Explosive gas atmospheres: Typical gas		Class I Subgroups
IIA	Propane	Propane	Class I Group D
IIB	Ethylene	Ethylene	Class I Group C
IIC	Hydrogen	Hydrogen	Class I Group B
	Acetylene	Acetylene	Class I Group A
Group III Subgroups	Atmospheres with combustible dust Type of dust		Class II / III Subgroups
IIIA	Combustible lint	Fibers and lint	Class III
IIIB	Non-conductive dust	Non-conductive dust	Class II Group G
IIIC	Conductive dust	Carbonaceous dust	Class II Group F
IIIC	Conductive dust	Combustible metal dust	Class II Group E

	ELECTRONIC DEVICES
ATEX	II (1) 2G	Ex d [ia Ga] IIC	T4	Gb*
IECEx		Ex d [ia Ga] IIC	T4	Gb*
NEC 500
NEC 505		I (1) 1A	T4
NEC 506
	^{*If the alternative symbols are used, the EPL can be omitted.}

TEMPERATURE CLASSIFICATION
Maximum surface temperature	Gas temperature classes		Maximum surface temperature	Gas temperature classes
	Device marking			Device marking
	NEC 500	CENELEC / IEC /NEC 505		NEC 500	CENELEC / IEC /NEC 505
450°C	T1	T1	200°C	T3
300°C	T2	T2	180°C	T3A
280°C	T2A		165°C	T3B
260°C	T2B		160°C	T3C
230°C	T2C		135°C	T4	T4
215°C	T2D		120°C	T4A
^{Dust: maximum surface temperature specified in °C}			100°C	T5	T5
^{Dust: maximum surface temperature specified in °C}			85°C	T6	T6

ZONES
Hazardous explosive atmosphere		Continuously, frequently or long-term	Occasionally	Rarely and briefly
Gas	CENELEC/IEC/NEC 505	Zone 0	Zone 1	Zone 2
Gas	NEC 506 (Class I)	Division 1		Division 2
Dust	CENELEC/IEC/NEC 505	Zone 20	Zone 21	Zone 22
Dust	NEC 506 (Class II, III)	Division 1		Division 2

TYPES OF PROTECTION FOR ELECTRICAL EQUIPMENT IN EXPLOSIVE ATMOSPHERES
Degree of protection	Symbol	Zone	Depiction	Main application	Standard
General requirements					IEC 60079-0 EN 60079-0 UL 60079-0
Increased safety	e,eb, ec	1 2		Terminals and junction boxes, control cabinets for installation of Ex components (which have a different type of protection), cage rotor motors, light fittings	IEC 60079-7 EN 60079-7 UL 60079-7
Flameproof enclosure	da d, db dc	0 1 2		Switchgears, switch devices and systems, control stations, display devices, indicating equipment,control systems, motors, transformers, heating devices, light fittings	IEC 60079-1 EN 60079-1 UL 60079-1
Pressurization	px, pxb py, pxb pz, pzc	1 21 1 21 2 22		Switching and control cabinets, analysis devices, large motors	IEC 60079-2 EN 60079-2 UL 60079-2
Intrinsic safety	ia ib ic	0 1 2		Measurement and regulation systems, fieldbus systems, sensors, actuators [Ex ib] = Related electrical equipment – installation in the safe area	IEC 60079-11 EN 60079-11 UL 60079-11
					IEC 60079-25 EN 60079-25 UL 60079-25
Oil immersion	o, ob oc	1 2		Transformers, starting resistors	IEC 60079-6 EN 60079-6 UL 60079-6
Powder filling	q, qb	1		Sensors, indicators, electronic ballasts, transmitters	IEC 60079-5 EN 60079-5 UL 60079-5
Encapsulation	ma mb mc	0 20 1 21 2 22		Switch devices for low output levels, command and signaling devices, indicators, sensors	IEC 60079-18 EN 60079-18 UL 60079-18
Type of protection "n"	nA, nAc nC, nCc nR, nRc	2 2 2		All electrical equipment for Zone: 2 nA = non-sparking equipment nC = sparking equipment in which the contacts are protected in some suitable way nR = restricted breathing enclosures	IEC 60079-15 EN 60079-15 UL 60079-15
Optical radiation	op_, op_a op_, op_b op_, op_c	0 20 1 21 2 22		op is = intrinsically safe optical radiation op pr = protected optical radiation op sh = shielded optical radiation	IEC 60079-28 EN 60079-28 UL 60079-28
Protection by enclosure	ta tb tc	20 21 22		Switch devices and systems, control cabinets, junction and terminal boxes, motors, lights	IEC 60079-31 EN 60079-31 UL 60079-31

The following HBM products are available in certified ATEX versions

*Beam and RTN load cells also have EAC conformity. If you would like to find out about HBK products and EAC markings, or if you have have additional questions concerning ATEX, please contact us.

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ATEX directives for products used in potentially explosive atmospheres

Explanation of ATEX Markings

ATEX Directive 2014/34/EU

Extended Scope

ATEX markings at a glance

The following HBM products are available in certified ATEX versions

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