Zone
Description
Supported?
Gas
0
Explosive gas air mixture continuously present.
✓
1
Explosive gas air mixture likely to occur in normal
operation.
✓
2
Explosive gas air mixture not likely to occur, and if it does
it will only exist for a short time.
✓
Dust
20
Explosive atmosphere in the form of a cloud of
combustible dust in air is continuously present, or for long
periods or frequently.
NO
21
Explosive atmosphere in the form of a cloud of
combustible dust in air is likely to occur occasionally in
normal operation.
NO
22
Explosive atmosphere in the form of a cloud of
combustible dust in air is not likely to occur in normal
operation, but if it does occur, will only persist for a short
period.
NO
Group
Definition
Supported?
Gas
IIA
e.g. Propane
✓
IIB
e.g. Ethylene
✓
IIC
e.g. Hydrogen
✓
Dust
IIIA
Combustible flyings
NO
IIIB
Non-conductive dusts
NO
IIIC
Conductive dusts
NO
Table 1:
Gas and Dust Zones in which the ExTempMini may or may not be used
Table 2:
Gas and Dust Groups in which the ExTempMini is suitable/unsuitable for use
3
INTRINSIC SAFETY CERTIFICATION
All models of the ExTempMini have been issued an ATEX (CML 22ATEX2007X) Certificate for
use in gas explosive atmospheres in above ground installations.
The sensing head can be used in all gas Zones including Zone 0. The main enclosure can be
installed in Zone 1. The sensing head temperature classification is T3 for ambient
temperatures above 115°C.
Tables 1-3 describe the ATEX Gas Groups, Gas Zones, and gas ignition temperature
classifications in which the ExTempMini is suitable:
