ATEX Hazardous Zone equipment protection concepts

ATEX,hazardous zone

The ATEX directive controls the manufacturing and import of electrical equipment used in hazardous zone. Hazardous zone are areas with the presence of flammable gases, vapors and liquids in sufficient quantities to cause an explosion or fire. ATEX requires equipment to be safe and provided with labels/CE markings.
Atex refers to two European Union (EU) directive, these are 94/9/EC and 1999/92/EC. Both of these are related to one another, 94/9/EC is the equipment directive and 1999/92/EC is the use directive. The equipment directive concerns with the manufacturers and Ex equipment while use directive relates to the classification of hazardous area.
ATEX covers electrical equipment with following criteria:
• Electrical equipment must have an ignition source.
• Equipment’s should be specifically designed for use in an explosive atmosphere at normal temperature and pressure.
• The atmosphere can have gas, vapors, mist or dust as fuel but should be based on air as oxidizers.

Mandatory information on the label required by ATEX 94/9/EC is mentioned below

1. Name and address of the manufacturer(s)
2. The CE marking
3. Serial number, type and model reference
4. Manufacturing year
5. The ATEX marking
6. Any other markings and comments

Product Classification:
Group I: Products to be used in gassy mines.
Mining products are divided into two categories
Category M1: Equipment or system with maximum level of protection
Category M2: Equipment or system with high level of protection. They should be able to disconnect in the presence of gas.
Group II: Equipment’s intended for use on the surface, directive 94/9/EC classified products in categories and relation to the level of protection, installation environment etc. Divided into three categories:
Category 1: Equipment or protective systems with a maximum level of protection.
Category 2: Equipment or protective systems with a high level of protection.
Category 3: Equipment or protective systems with a normal level of protection.

Explosion Classification
Each product will have will have atleast one explosion classification indicating protection concepts and approved environments. If equipment falls under more than one ATEX group, the explosion classification will differ. If equipment is certified with ATEX and IECEx there are additional explosion classification from IECEx scheme which are not part of ATEX system.

Below are the explosion classification codes and their meaning:

EEx– Product complies with an EN standard.
Q-“protection concept” is “power-filled”.
IIA– Suitable for use with Gas Group II1 (propane)
T5– Maximum surface temperature 100°C
Ga– Very high equipment protection level

Temperature Classes
The maximum surface temperatures for equipment in ATEX explosion classification as a “T” value, ranging from T1 to T6 (T6 being the safest).

ATEX,hazardous zone

 

 

 

 

 

 

ATEX protection for mechanical equipment

ATEX mechanical protection is based on the risks and variability of a situation where equipment must be safe in normal as well abnormal work conditions. Mechanical protection concepts are defined in multi-part EN13463 standard; please see below for more information.

ATEX,hazardous zone

 

 

 

 

 

 

ATEX directive allows manufactures to introduce innovation in products. After the designated technical and quality objective are met manufacturers is entitled to display a distinctive European mark. This symbol ATEX,hazardous zoneis recognized throughout the European Union.

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