4
5
INM MTL9373-FB3 Rev 1
INM MTL9373-FB3 Rev 1
3
PERMITTED CONFIGURATIONS
A maximum of two 12-spur, Fieldbus Barrier modules is permitted per Fieldbus trunk.
The permitted options are illustrated in Figure 3.1 - (a), (b) and (c).
a) A single barrier module in a field enclosure - with termination
b) Two barrier modules in a single field enclosure - with termination only on
second barrier
See section 5 – Electrical Installation - for information on providing the appropriate
termination conditions for the trunk wiring.
Figure 3.1
– Permitted implementations for Fieldbus Barriers
1
2
3
10
11 12
from HOST
Trunk
Not
intrinsically
safe
Intrinsically
safe spurs
T
1
2
3
10
11 12
from HOST
Trunk
Not
intrinsically
safe
Intrinsically
safe spurs
1
2
3
10
11 12
Intrinsically
safe spurs
T
1
2
3
10
11 12
from HOST
Trunk
Not
intrinsically
safe
Intrinsically
safe spurs
1
2
3
10
11 12
Intrinsically
safe spurs
T
(a)
(b)
(c)
4
MECHANICAL INSTALLATION
See Figure 4.1 and 4.2 below for the dimensions, fixing locations and cable
gland positions of the two main enclosure options.
Figure 4.1 –
Fieldbus Barrier Standard Small enclosure dimensions
Notes:
1. The enclosure is also available with a stainless-steel mounting bracket for a
traffolyte tag label. (See Figure 4.2 for more details.)
2. A hinged lid with a quarter-turn lock (not shown here) is a further option when
ordering. This does not affect the overall enclosure dimensions.
11
(267
- W
all fixiing c
en
tres)
Ø 11
(362 - Wall fixing centres)
M10 "Earth" weld stud
30
5
35
65
70
32
41
3x20=60
20
142
183
3x20=60
13 off, Ø 20.3
±0.20
2 off Trunk gland positions
20.3 ±0.2
(68)
(13
)
(152 )
Lid - Fully bolted
