Automation in Explosive Areas

Region Classification

Areas with potential risk are divided into zones for selecting suitable devices and for proper installation.

The regional classification, in a sense, indicates an excess of Hazard.

  • Classification IEC 60079-10-1 for gas-based hazardous areas
  • Classification IEC 61241-10-2 for dust-based hazardous areas
Automation in Explosive Areas

Classification of explosive area areas

Category M1

Very high degree of security. Security even with few device failures. Devices can be operated continuously in potentially explosive areas.

Category M2

High degree of security. Safety in normal applications under harsh working conditions. The device must be switched off in case of potential explosion.

Category 1

Very high degree of security. Security even with few device failures. Safe even in 2 independent explosions or 2 independent errors.

Category 2

High degree of security. Still safe when device failure in common areas

Category 3

Normally safe. Safe in normal operation.

G or D coding, G – GAS, D – Powder Environment
Ex-Zone Example

Automation in Explosive Areas

Equipment Categories

EPL Ma

Very high safety device that can be used in mines, it guarantees high security, sensitive to grizu explosion. It does not risk ignition in case of faults, it can be operated even in case of gas leakage.

EPL Mb

The high safety device that can be used in mines provides high security guarantee sensitive to grizu explosion. The device must be turned off in case of gas leakage or malfunctions.

EPL Ga or Da

The device with a very high safety level can be used in areas at risk of explosion. There is no risk of sparking in case of malfunction or breakdown.

EPL Gb or Db

The device with a high level of safety can be used in areas at risk of explosion. There is no risk of sparking in case of malfunction or breakdown.

EPL Gc or Dc

The device with improved safety level can be used in explosion-prone areas. . There is no risk of sparking in case of malfunction or breakdown.

Explosive Groups

Group 1

Devices used in Grizu sensitive mines.

Group 2 (Class I)

Devices used for explosive zones with gases, excluding mines

Group 2 (Class II / III)

IEC 60079-0 2007

Devices for areas with flammable DUST, except mines.

In contrast to the standard, these groups are not included in the ATEX guidelines.

Automation in Explosive Areas

Classification of explosive groups

Marking

Automation in Explosive Areas

 

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1 Response

  1. July 6, 2020

    […] explosion is the release reaction of the high energy that flammable substances perform together with oxygen […]

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