ATEX - NB(Notification Body) No. :

ATEX Certification, Directive 94/9/EC (EN 60079) is mandatory to only certify by the Lab that is permit by European Commission.

Which can be verify in http://ec.europa.eu/enterprise/newapproach/nando/index.cfm?fuseaction=notifiedbody.main

*Note: All ATEX certification is mandatory to have this NB no. for verification purpose

 

ATEX Labeling:

ATEX Labeling is the most important information in the ATEX certification, it stated the level of protection the fixture provide and location that it can be use.

It is base off of ATEX Directive 94/9/EC, and is in specify order/arrangement.

 

Explain of ATEX Labeling Order/Arrangement:

 

ATEX - Equipment Category:

Category 1  :  Equipment may be used in zone 0, zone 1 or zone 2 areas.

Category 2  :  Equipment may be used in zone 1 or zone 2 areas.

Category 3  :  Equipment may only be used in zone 2 areas.

ATEX - Gas Group:

Group

Representative Gases

I

All Underground Coal MiningFiredamp (methane)

IIA

Industrial methanepropanepetrol and the majority of industrial gases

IIB

Ethylene, coke oven gas and other industrial gases

IIC

Hydrogenacetylenecarbon disulphide

Apparatus marked IIB can also be used for IIA gases. IIC marked equipment can be used for both IIA and IIB. If a piece of equipment has just II and no A, B, or C after then it is suitable for any gas group.

ATEX - Type of Protection:

 

Ex Code

Description

Standard

Location

Use

Flameproof

d

Equipment construction is such that it can withstand an internal explosion and provide relief of the external pressure via flamegap(s) such as the labyrinth created by threaded fittings or machined flanges. The escaping (hot) gases must sufficiently cool down along the escape path that by the time they reach the outside of the enclosure not to be a source of ignition of the outside, potentially ignitable surroundings.
Equipment has flameproof gaps (max 0.006" (150 um) propane/ethylene, 0.004" (100 um) acetylene/hydrogen)

IEC/EN 60079-1

Zone 1 if gas group & temp. class correct

Motors, lighting, junction boxes, electronics

Increased Safety

e

Equipment is very robust and components are made to a high quality

IEC/EN 60079-7

Zone 2 or Zone 1

Motors, lighting, junction boxes

Oil Filled

o

Equipment components are completely submerged in oil

IEC/EN 60079-6

Zone 2 or Zone 1

switchgear

Sand/Powder/Quartz Filled

q

Equipment components are completely covered with a layer of Sand, powder or quartz

IEC/EN 60079-5

Zone 2 or Zone 1

Electronics, telephones, chokes

Encapsulated

m

Equipment components of the equipment are usually encased in a resin type material

IEC/EN 60079-18

Zone 1 (Ex mb) or Zone 0 (Ex ma)

Electronics (no heat)

 

Pressurised/purged

p

Equipment is pressurised to a positive pressure relative to the surrounding atmosphere with air or an inert gas, thus the surrounding ignitable atmosphere can not come in contact with energized parts of the apparatus. The overpressure is monitored, maintained and controlled.

IEC/EN 60079-2

Zone 1 (px or py), or zone 2 (pz)

Analysers, motors, control boxes, computers

Intrinsically safe

i

Any arcs or sparks in this equipment has insufficient energy (heat) to ignite a vapour
Equipment can be installed in ANY housing provided to IP54.
A 'Zener Barrier' or 'opto isol' or 'galvanic' unit may be used to assist with certification.
A special standard for instrumentation is IEC/EN 60079-27, describing requirements for Fieldbus Intrinsically Safe Concept (FISCO) (zone 0, 1 or 2)

IEC/EN 60079-25
IEC/EN 60079-11
IEC/EN60079-27

'ia': Zone 0 &
'ib': Zone 1
'ic: zone 2

Instrumentation, measurement, control

Non Incendive

n

Equipment is non-incendive or non-sparking.
A special standard for instrumentation is IEC/EN 60079-27, describing requirements for Fieldbus Non-Incendive Concept (FNICO) (zone 2)

IEC/EN 60079-15
IEC/EN 60079-27

Zone 2

Motors, lighting, junction boxes, electronic equipment

Special Protection

s

This method, being by definition special, has no specific rules. In effect it is any method which can be shown to have the required degree of safety in use. Much early equipment having Ex s protection was designed with encapsulation and this has now been incorporated into IEC 60079-18 [Ex m]. Ex s is a coding referenced in IEC 60079-0. The use of EPL and ATEX Category directly is an alternative for “s” marking. The IEC standard EN 60079-33 is made public and is expected to become effective soon, so that the normal Ex certification will also be possible for Ex-s

IEC/EN 60079-33

Zone depending upon Manufacturers Certification.

As its certification states

ATEX - Temperature Class

T1  - Highest surface temperature not greater then 450 degree C.

T2  - Highest surface temperature not greater then 300 degree C.

T3  - Highest surface temperature not greater then 200 degree C.

T4  - Highest surface temperature not greater then 135 degree C.

T5  - Highest surface temperature not greater then 100 degree C.

T6  - Highest surface temperature not greater then 85 degree C.

ATEX - Equipment Protection Level (EPL):

EPL

Ex risk

Ma

energized

Mb

de-energized in presence of Ex atmosphere

Ga

explosive atmosphere > 1000 hrs/yr

Gb

explosive atmosphere between 10 and 1000 hrs/yr

Gc

explosive atmosphere between 1 and 10 hrs/yr

Da

explosive surface > 1000 hrs/yr

Db

explosive surface between 10 and 1000 hrs/yr

Dc

explosive surface between 1 and 10 hrs/yr

ATEX - IEC/European   VS  North American Classification

European and IEC Classification

Definition of zone or division

North American Classification

Zone 0 (gases / Vapors)

An area in which an explosive mixture is continuously present or present for long periods

Class I Division 1 (gases)

Zone 1 (gases / Vapors)

An area in which an explosive mixture is likely to occur in normal operation

Class I Division 1 (gases)

Zone 2 (gases / Vapors)

An area in which an explosive mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time.

Class I Division 2 (gases)

Zone 20 (dusts)

An area in which an explosive mixture is continuously present or present for long periods

Class II Division 1 (dusts)

Zone 21 (dusts)

An area in which an explosive mixture is likely to occur in normal operation

Class II Division 1 (dusts)

Zone 22 (dusts)

An area in which an explosive mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time.

Class II Division 2 (dusts)