Calex ExTemp Series Manual do operador - Página 3

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Zone
Description
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.
21
Explosive atmosphere in the form of a cloud of
combustible dust in air is likely to occur occasionally in
normal operation.
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.
Table 1: Gas and Dust Zones in which the ExTemp may be used
Group
Definition
Gas
IIA
e.g. Propane
IIB
e.g. Ethylene
IIC
e.g. Hydrogen
Dust
IIIA
Combustible flyings
IIIB
Non-conductive dusts
IIIC
Conductive dusts
Table 2: Gas and Dust Groups in which the ExTemp is suitable for use
Gas Ignition Temperature
450 °C
300 °C
200 °C
135 °C
100 °C
85 °C
Table 3: Gas ignition temperature classifications to which the ExTemp conforms
Classification
T1
T2
T3
T4
T5
T6
Supported?
Supported?
Supported?
NO
NO
3