Device Category

The Device Category is determined depending on the corresponding potentially explosive Zone in which a device is to be used.

  • Categories in Group I:
    • M1:  high degree of safety, safe even if two independent faults occur
    • M2: high degree of safety
  • Categories in Group II:
    • 1 : very high degree of safety
    • 2 : high degree of safety
    • 3 : normal degree of safety 

Device Category

Avoidance of effective sources of ignition

Degree of safety

Approved for Zone

Presence of potentially explosive atmosphere

3

In normal use

Normal

2
22

Seldom or for short periods

2

Including in the event of normal faults

High

1, 2
21, 22

Occasionally

1

Including in the event of infrequent faults

Very high

0, 1, 2
20, 21, 22

For long periods, constantly or frequently

As an example: For use in Zone 1 of Group II, a device must be used which belongs at least to Category 2, or preferably Cat.1.

Lokalizacje: HUMMEL AG

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