ATEX direktiva -osnove:
Marking of equipment used in potentially explosive atmospheres according to ATEX Directive 91/9/EC
(also known as ATEX 95 and ATEX 100a) and EN 13463 pt 1-8

1	2	3	4	5	6	7
		II	2 G	EEx ck	IIC	T4

The following information is intended as a general summary of the most common aspects of ATEX marking legislation relevant to Lightnin’s products and should be used as a guide only.

3. Classification of equipment
Equipment Group	Equipment Category	Atmosphere	Protection level	Required Protection Performance & Operation
I (Mines)	M1	Methane & Dust	Very High	Safe with two independent faults and must remain operational
II (Above Ground)	1	Gas, Vapour, Mist, Dust	Very High	Two independent means of protection or safe with two separate faults
II (Above Ground)	2	Gas, Vapour, Mist, Dust	High	Safe in normal operation and if common faults occur
II (Above Ground)	3	Gas, Vapour, Mist, Dust	Low	Safe in normal operation

3,4. Conditions in the Potentially Explosive atmosphere
Flammable Material	Temporary behaviour of the flammable material in the potentially explosive atmosphere	IEC Classification of the potentially explosive atmospheres	Required marking of the applied device per ATEX
			Equipment group	Equipment category
Gases, vapours	• Are present continuously, for long periods or frequently	Zone 0	II	1G
	• Are likely to occur	Zone 1	II	2G (1G equipment may be used)
	• Are unlikely to occur or, if they do occur, are likely to do so only infrequently and for a short period only	Zone 2	II	3G (1G or 2G equipment may be used)
Dusts	• Are present continuously	Zone 20	II	1D
	• Are likely to occur	Zone 21	II	2D (1D equipment may be used)
	• Are unlikely to occur in case of whirled dust or, if they do occur, are likely to do so only infrequently and for a short period only	Zone 22	II	3D (1D or 2D equipment may be used)
Methane, dust	-	Mining	I	M1, M2 or M3

5. Methods of Protection
Method of Protection	Marking	Protection Principle
Electrical equipment for gases, vapours & mists according to CENELEC
Flameproof enclosure	EEx d	Contain the explosion & prevent flame propagation
Increased safety	EEx e	No arcs, sparks or hot surfaces
Non Sparking	EEx n	No arcs, sparks or hot surfaces
Intrinsic Safety	EEx i	Limit the energy of the spark and surface temperature
Non-electrical equipment and machinery according to 13463-1 CEN
Constructional Safety	EEx c	Design to prevent ignition sources arising
Liquid immersion	EEx k	Keep the explosive atmosphere out by immersion in fluid

6. Classification of gases and dusts per CENELEC/IEC
Gas Group	Temperature Class
	T1	T2	T3	T4	T5	T6
I	Methane	-	-	-	-	-
IIA	Ammoniac Methane Ethane Propane	Ethyl alcohol Cyclohexane n-butane n-hexane	Fuel in general Aircraft fuel n-hexane Fuel oil	Acetaldehyde	-	-
IIB	Lighting gas Acrylonitrile	Ethylene Ethylene oxide	Ethylene glycol Hydrogen sulphide	Ethyl ether	-	-
IIC	Hydrogen	Ethine (Acetylene)	-	-	-	Coal disulphide

7. Temperature Classification
CENELEC/IEC (Group II) Classification	Max Surface Temperature	Comments
T1	450ºC (842ºF)	Temperature relates to all parts of equipment that can come into contact with the potentially explosive atmosphere
T2	300ºC (572ºF)
T3	200ºC (392ºF)
T4	135ºC (275ºF)
T5	100ºC (212ºF)
T6	85ºC (185ºF)
Tx	Maximum surface temperature not defined	Applied to closed tank units where transmission of temperature from the vessel to mixer parts cannot be controlled by Lightnin. Assessment of machine temperature class is the responsibility of the client.

EXAMPLE EQUIPMENT MARKING

   XXX XXX    II 2 G EEx ck IIC T4

ATEX Category 2 (gas) equipment designated for installation in Zone 1. Protection by constructional safety and liquid immersion, suitable for hydrogen atmosphere with maximum equipment surface temperature of 135ºC.