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Aeroqual Series 900 User Guide
3.3.1. Procedure
a. Connect the 4-20mA loop on the screw connector to the power supply and current measuring
device (e.g. PLC) ensuring the polarity is correct. Please refer to the diagrams below.
Note: If the polarity is incorrect the 4-20mA output may be permanently damaged
b. Power on the S930 and PLC
c. Check the PLC or current sensing device to ensure data is being shown
Note: The 4-20mA outputs are located on the side of the unit as shown in the diagrams below
4-20 mA wiring diagram for Loop without opto-isolation
4-20 mA wiring diagram for Loop with opto-isolation
GND +
- +
- +
Power Supply
24VDC
4-20mA
+
-
PLC or Current Meter
Power Supply
GND +
GND +
- +
Power Supply
24VDC
4-20mA
+
-
PLC or Current Meter