Lightnin Mixer Standards- ATEX Marking
Published with permission from Lightnin 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.
Table Scrolls Horizontally
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 |
Table Scrolls Horizontally
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 |
Table Scrolls Horizontally
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
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.