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Pag. 44
Detectors with 4-20 mA output
Detectors with 4-20mA analog output are connected to the unit via remote 8-input modules
STG/IN8S. The modules are connected on the panel’s bus to be field mounted far from the
control panel.
A 4-20mA transmitter requires a 3-core wire for connections: 2 wires for power supply (usual-
ly 12 to 28 Vdc but refer to the gas detector technical manual) and one wire for the 4-20 mA
signal. A 3x0.75 mm2 shielded wire is recommended since it can cover a 100 m distance
between the gas detector and STG/IN8S input module.
Detectors with 4-20 mA output directly connected to the unit
Figure 8) Connection of the 8 detectors to the control panel
Detectors with 4-20 mA output connected to STG/IN8S input module
The following diagram illustrates connections between a 4-20mA gas detector and a STG/
IN8S input module. When starting the system, make sure minimum 12 Vdc voltage reaches
each gas detector.
Figure 9) Connection of the 8 detectors of the STG/IN8S module
8 analogue 4-20 mA inputs
S: 4-20 mA signal
V+: V+ of detector power supply
V- : V- of detector power supply
+ -
S
B
A
B
A
V- S S S S V+
4 3 2
1
V- S S S S V+
8 7 6
5
1
2
7
6
5
VI+
VI-
VO-
VO+
NC
1
2
7
6
5
VI+
VI-
VO-
VO+
NC
+ -
S
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Input 8
0
0
1
4
OFF
ON
V-
V+
B
A
V-
V+
V+
V-
Содержание MULTISCAN++/S1-32
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