User manual - METER SRP-N118
a)
b)
Figure 4.11. Connections of 2-wire sensor:
a) active, b) passive (needs additional supply)
meter has no galvanic separation between measurement input and RS-
485 interface. If serial connection of multiple units is made or serial connection with
other device, without galvanic separation of RS-485 interface, is made then RS-485
interface separators must to be used certainly (Figure 4.12, 4.13).
If RS-485 interfaces are isolated or not used then the separators are not necessary.
Figure 4.12. Serial connection of active 2-wire sensor with
unit
and other current measurement device (e.g. PLC controller).
12
11 10
+
-
Current source
0 - 20mA or
4 - 20mA
11 10 9 8 7 6
+
-
connected internally
-
+
Current source
0 - 20mA or
4 - 20mA
11 10 9 8 7 6
connected internally
G
galvanic
insulation
+
-
A
B
+
-
R
B
!
Summary of Contents for SRP-N118
Page 51: ...User manual METER SRP N118 51...
