Heating Chambers - Explosion protection
Classification and marking acc. to ATEX 95The manufacturer commits itself to keep the EC-guidelines, e.g. RL94/9/EG resp.. DIN EN 500 13 A1
Accredited Bodies (in extract)| Accred. Bodies
|
Country | Ident |
| PTB | Germany
|
0102 |
| EXAM | Germany | 0158 |
| DOS | Germany | 0297 |
| BAM | Germany | 0589 |
| EECS | GB | 0600 |
| SIRA | GB | 0518 |
| Accred. Bodies | Country | Ident |
| INERIS | France | 0080 |
| LCIE | France | 0081 |
| LOM | Spain | 0163 |
| UL | USA | - |
| FM | USA | - |
| CSA | Canada | - |
Standardized sign for free merchandise movement within the EU/EC
Standardized sign for free merchandise movement within the EU/ECGROUP 2: other explosion endangered areas (over ground)
Explosion groups| Category Gas | Zone |
| 1 G | 0 (Gas) |
| 2 G | 1 (Gas) |
| 3 G | 2 (Gas) |
| M 1 | Coal Mining |
| M 2 | Coal Mining |
| Category Staub | Zone |
| 1 D | 20 (Dust) |
| 2 D | 21 (Dust) |
| 3 D | 22 (Dust not conductible) |
| 2 D | 22 (Dust conductible) |
| 2 D | 22 (Dust conductible) |
MarkingEX = Explosion protected
Kennzeichnung| Type of protection
|
Scheme/
Image |
Main application | Standard |
| e - increased safety
(especially mechan. constructions) |
 |
terminal and junction boxes, control boxes for installing Ex-components
(with a different type of protection), squirrel-cage motors, light fittings |
EN 50 019
|
| d - flame proof
enclosure |
 |
switchgear and control station and indicating equipment,
control systems, motors, transformers, heating equipment, light fittings |
EN 50 018
|
| p - pressurized
apparatus |
 |
switchgear and control cabinets, analysers, large motors
px = for use in Zone 1, 2 py = for use in Zone 1, 2 pz = for use in Zone 2 |
EN 50 016
|
| i* - intrinsic safety
|
 |
instrumentation technology,
fieldbus technology, sensors, actuators |
EN 50 020
|
| o - oil immersion
|
 |
transformers, starting resistors
|
EN 50 015
|
| q - powder filling
|
 |
transformers, capacitors, terminal boxes
for heating conductors |
EN 50 017
|
| m - encapsulation
|
 |
switchgear with small capacity, control and
signalling units, display units, sensors ma = for use in Zone 0, 1, 2 mb = for use in Zone 1, 2 |
EN 50 028
|
| n - non-sparking
(simplified application) |
Zone 2
summarized |
all electrical apparatus for zone 2,
less suitable for switches |
EN 50 021
|
ia = ia = for use in Zone 0, 1, 2 and ib = for use in Zone 1, 2 [EEx ib] = associated electrical apparatus – installation in the safe area
Admitted for use in areas of following substances (among others)| typical Gases | ignition energy /mJ | Europe Atex | USA UL |
| Methane
|
280 | I | Mines |
| Propane | > 180 | II A | D |
| Ethylene
|
60 - 180 | II B | C |
| Hydrogen | < 60 | II C | B |
| Acetylene | - | II C | A |
Temperature classification| Max. permitted
surface temperature |
T1 | T2 | T3 | T4 | T5 | T6 |
| 450°C | 300°C | 200°C | 135°C | 100°C | 85°C |
Mechanical Explosion Protection ATEX 95(e.g. danger of explosion by friction or abrasion of mechanical parts, e.g. bearing or brakes are overheating)
Ignition preventive measures| -fr- = protection by cloud-restraining encapsulation
|
-b- = ignition source monitoring
|
| -d- = pressurized encapsulation
|
-p- = overpressure encapsul.
|
| -g- = intrinsic safety
|
-k- = liquid encapsulation
|
| -c- = protection by safe construction
|
EEx-Marking example:
fr II T4 ignition enclosure (mechanically)
EEx II 3 G application (zone 2)
Examples for classification of gases and vapours in explosion groups and temperature classes| T1 | T2 | T3 | T4 | T5 | T6 | |
| I | Methan
|
- | - | - | - | - |
| II A | Acetone
Ethan Ethylacetat Ammoniac Benzene(pure) Acetic acid Carbon monoxid Methane Methanol Propane Tuluene |
Ethyl alcohol
i-Amylacetat n-Butane n-Butyl alcohol |
Benzene
Diesel- Kerosene- Heating oil n-Hexane |
Acetyl aldehyde
Ethylether |
- | - |
| II B | City gas
(illuminating gas) |
Ethylene
|
- | - | - | - |
| II C | Hydrogen
|
Acetylene
|
- | - | - | Sulphur hydro-
carbon |
Classification for the definition of explosion endangered zones| explosive
atmosphere existing |
Europe | USA/Canada | |||
| gases
Zone |
dust
Zone |
gas
Cl./Div. |
dust
Cl./Div. |
fibres
Cl./Div. |
|
| continuously (> 1000 h/year)
|
0 | 20 | I/1 | II/1 | III/1 |
| likely to occur (10-1000 h/Jahr)
|
1 | 21 | I/1 | II/1 | III/1 |
| infrequently (> 10 h/year)
|
2 | 22 | I/2 | II/2 | III/2 |
Marking of the IP-protection classes (acc. to EN 60529)0 = no protection
1 = foreign body> 50 mm
2 = foreign body> 12 mm
3 = foreign body> 2,5 mm
4 = foreign body> 1 mm
5 = dust protectedt
6 = dust tight
-
-
0 = no protection
1 = water droplets falling vertical
2 = water droplets falling at an angle (75-90°)
3 = protected against spraying water
4 = protected against splashing water
5 = protected against water jets
6 = protected against flooding
7 = temporary immersion
8 = continuous immersion
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