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Hochiki Europe (UK) Ltd
2-3-0-810/ISS3/SEP14
Equipment Markings
Equipment
Category
Definition
Type of Explosive
Atmosphere
Group II
G - gas vapour mist
D - dust
Zone
1
- very high level of protection
in which explosive atmosphere mixtures of
air gases, vapours or mist are present
continuously, for long periods
0
2
- high level of protection
in which explosive atmosphere mixture of
air and gases, vapours or mist are likely to
occur
1
3
- normal level of protection
in which explosive atmosphere mixtures of
air and gases, vapours or mist are unlikely
to occur and if it occurs it will exist only for a
short period
2
These Flame Detectors are suitable for equipment categories 2 and 3, G or D.
Note: The detectors are not certified for category 1 areas, see ‘IS’ products.
Table 1Equipment Categories and Type of Explosive Atmosphere (Group II)
