Hochiki IFD-E(EXD) - Manual (Page 4)

4 Hochiki Europe (UK) Ltd
2-3-0-810/ISS3/OCT11
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)