MERIDIAN
UNIVERSAL GAS DETECTOR
INSTALLATION
4-34
USE AND DISCLOSURE OF DATA
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prohibited.
Figure 4-17: Connection for 4-Wire Sourcing with Isolated Loop Power Supply
NOTE: These are examples of typical configurations. Other combinations exist and vary based on
each configuration.
VDC Power
Supply
+
-
Receiver
+
-
Common
Output
4-20 mA
10 to 30 VDC
Shield
ALARM3
NO
C
NC
NO
C
NC
FAULT
LP1
11
+ - + -
LP2
RS-
+ -
LP3
B A
10-30VDC
+V
GND
Common
+
-
+
-
Receiver
Receiver
+
-
Loop
(24VDC)
P. S.
Shield
SW1 Up= Isloated
SW1 Down= Non-Isolated
ISO
SW1
NON
J3
Power Supply PCB
1
3
5
- +
NORMAL
NORMAL
HART
- +
1
3
5
- +
1
3
5
Dashed Lines Represent
Multi-Head Connetions
Loop
(24VDC)
+
P. S.
-
Loop
P. S.
-
(24VDC)
+
