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11
SM720 Capacitive Level Transmitter
To read the output signal in this system, it depends on the loop
current in the two wires that allows the user to put as many reading
devices as needed and take the signal for long distance without
problems
SM720 Sensor
LD1
AEC
LD2
Alex Electronics Co.
IE7XX
-
+
4-20mA
AEC
Alex Electronics Co.
IE7XX
4-20
-
+
4-20mA
Fig.7: 2 wires connected to PLC AD card
. 1 Supply
. 2 DCS control room
. 3 Control
. 4 PLC Analog card
i
NOTE
1. If the two lines from the supply point are long distance, cables
must be shielded to avoid noise influence on the Signal
2. Connect the cable screen to the earth terminal of the electronic
card
3. Pin 3 in the output terminal is connected to earth, use it when
needed to connect external earth line to your system.
4. The calibration socket is for technical users only and not used
by end users unless you have the calibration module.
Span
Zero
3
LD1
LD2
Span
Zero
Alex Electronics Co.
Control Panel
+
2
4
+
24
IN
1
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