Application For Ex D Transmitters Categories 1/2 G And 1/2 D - ABB 2600T Series Operating Instruction

13.4 Application for Ex d transmitters categories 1/2 G
and 1/2 D
ATEX II 1/2 G Ex d IIC T6 -
ATEX II 1/2 D Ex tD A21 IP67 T85°C (-50 °C ≤ Ta ≤ 75 °C).
FM approval FM09ATEX0068X
The meaning of the ATEX code is as follows:
II: Equipment group for hazardous areas above
ground (not mines)
1/2: Category - This means that the transmitter is suited
for use in the partition for Category 1 (e.g. sensor in
Category 1 / transmitter in Category 2) is suited -
see example of application.
G: Gas (dangerous media)
D: Dust (dangerous media)
T85°C: Maximum surface temperature of the transmitter
housing at an ambient temperature Ta of up to
75 °C for dust (not for gas) with a dust layer up to
50 mm thick.
The rest of the tag relates to the type of protection according
to the relevant EN standards:
Ex d: Flameproof (enclosure)
IIC: Explosion group gases
T6: Temperature class of the transmitter (corresponds
to 85 maximum) with an ambient temperature
from -50 °C to +75 °C
About the example applications:
Only the "measuring cell" of this transmitter can be connected
in Zone 0 (gas); while the remaining parts of the transmitter,
i.e., its housing, can only be used in Zone 1 (gas) - see figure.
The reason for this is that the measuring cell of the transmitter
has internal partitioning elements in accordance with
EN 60079-26 and EN 60079-1 which separate the power tap
from the area of the process in which the atmosphere is
potentially explosive at all times.
Where applications in areas with combustible dusts are
concerned, the transmitter is suitable for "Zone 21" in
accordance with EN 61241-1 as shown in the corresponding
section of the example applications.
70 OI/266CXX/266JXX/HART-EN Rev. B | 266CRx, 266JRx, 266CSx, 266JSx
13.4.1 xample applications
Zone „0"
Fig. 47: Application with gas
1 Container | 2 Dangerous medium (process) |
3 266TX transmitter, category 1/2 G, Ex d
Zone „20"
Fig. 48: Application with dust
1 Container | 2 Dangerous medium (process) |
3 266TX transmitter, category 1/2 D, Ex d
IMPORTANT (NOTICE)
Protection is afforded primarily by the IP degree
of protection; the low level of power consumed
from the power supply unit is also a contributing
factor. The type of protection can be either [ia] or
[ib].
1
Zone „1"
2
3
M10767
1
Zone „21"
2
3
M10768