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3.3 Connecting the pressure line
1 Disconnect the system from the electrical power
supply.
2 Close the gas supply.
3 Ensure that the pipeline is clean.
4 Purge the pipe.
➔ Connect the pipeline so that a clear view of the
display is guaranteed.
➔ The image may not show the actual installation
position.
Relative pressure sensor
Relative pressure (positive pressure) on port 1
➔ Seal port 2.
2
a
b
Relative pressure (positive pressure) on port 2
➔ Seal port 1.
2
a
b
Differential pressure sensor
Port 1 for the higher absolute pressure,
port 2 for the lower absolute pressure.
a
4 eLeCtRICAL ConneCtIon
1 Note the recommended tightening torques. See
page 9 (15.2.1 Recommended tightening
torque).
Voltage supply and 4–20 mA signal
2 Disconnect the system from the electrical power
supply.
➔ Connect the 24 V DC voltage supply using the
M12 plug connector (plug/plug, 4-pin, A-coded).
GND
4
+24 V=
1
3
1
1
c
1
2
3
GND
2
4–20 mA
Communication interface (10/100 Mbit/s (Fast
ethernet))
CAUtIon
Please observe the following to ensure that the
DG smart is not damaged during operation:
– If the Ethernet connection is not being used,
ensure that the sealing plug is still protecting the
connection. Otherwise, IP 65 is no longer
ensured.
If the Ethernet connection is not being used, the
following steps are not necessary.
➔ Connect the Ethernet using the M12 plug con-
nector (socket/coupling, 4-pin, D-coded).
TD-
RD+
4
2
➔ To prevent interference signals through the
Ethernet connection, we recommend that the
functional earth is connected using a fine-strand
cable (max. 4 mm
6 Only loosen the M4 screw terminal.
7
5 UseR KeYs AnD DIsPLAY
➔ Recorded data, parameters, settings and noti-
fications are output on the display in clear text.
Press and hold the OK key for around 1.5 s to
unlock the display and open the menu. Pressing
the OK or any other key briefly will enable the
backlight.
EN-3
4
RD-
3
2
1
TD+
5
2
).
8
9
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