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3.1 System Power/Loop Connections
Stand-alone application, no current loop used
Transmitter
Terminals
Sys. Pwr.
2
Loop -
Sys. Pwr.
1
Loop +
Connection to a PLC/Recorder, separate supply
Transmitter
Terminals
Sys. Pwr.
2
Loop -
1
Sys. Pwr.
Loop +
3.2 Sensor Input Connections
Wiring Tips:
•
Do not route sensor cable in conduit containing AC power wiring. Electrical noise may interfere with sensor signal.
•
Routing sensor cable in grounded metal conduit will help prevent electrical noise and mechanical damage.
•
Seal cable entry points to prevent moisture damage.
•
Only one wire should be inserted into a terminal. Splice double wires outside the terminal.
Transmitter
≤ 400 ft. (122 m)
‡ SIGNET 8750-1 pH/ORP Transmitter
Power Supply
DC 12 - 24 V
-
Power
Supply
+
Power
Supply
DC 12 - 24 V
-
Power
Supply
+
Power
Supply
PLC or Recorder
-
Loop Input
4-20 mA in
+
Loop Input
4-20 mA in
White (Temp)
Terminals
12
Green (Temp)
11
Blue (ISO GND)
10
Brown (mV input)
9
*
8
Silver (Shield)
7
Black (V-)
6
Red (V+)
5
* (connection of terminal 8 to Earth GND
may reduce electrical interference)
Connection to a PLC with built-in power supply
Transmitter
Internal PLC
Connection
Terminals
Sys. Pwr.
2
Loop -
1
Sys. Pwr.
Loop +
Example: Two transmitter connected to PLC/Recorder
with separate power supply
Transmitter 1
Sys. Pwr.
2
Loop -
Sys. Pwr.
1
Loop +
Transmitter 2
Sys. Pwr.
2
Loop -
Sys. Pwr.
1
Loop +
PLC
Terminals
-
Power Supply
Ground
+
Power
Supply
-
Loop Input
4-20 mA
+
Loop Input
4-20 mA
DC 12 - 24 V
Power
-
Supply
Power
+
Supply
PLC or Recorder
-
Channel 1
4-20 mA in
+
Channel 1
4-20 mA in
-
Channel 2
4-20 mA in
+
Channel 2
4-20 mA in
Preamp:
+GF+ SIGNET 2720
pH Electrodes
+GF+ SIGNET 2714, 2714-HF
+GF+ SIGNET 2716
ORP Electrodes:
+GF+ SIGNET 2715
+GF+ SIGNET 2717
page 3 of 12
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