14
EB 3930 EN
Pneumatic connection
5 Pneumatic connection
Risk of injury due to high pressure inside de-
vice.
Prior to performing repair and maintenance
work on the device, depressurize the con-
necting lines.
The air connections are designed as thread-
ed holes with G ¼ thread or NAMUR inter
-
face according to VDI/VDE 3845, depend
-
ing on the device version.
Î
Run and attach the connecting lines and
screw joints according to good profes-
sional practice.
Î
Check the connecting lines and screw
joints for leaks and damage at regular
intervals and repair them, if necessary.
Î
Protect the exhaust air connections by in-
stalling a filter or taking other appropri
-
ate precautions to prevent water or dirt
from entering them.
Î
The K
VS
coefficient of an upstream pres
-
sure reducing valve must be at least 1.6
times larger than the K
VS
coefficient of
the device.
Port labeling
Inscription
Function
1
Supply air
2/4
Output
3/5
Exhaust
WARNING
!
5.1 Sizing of the connecting
line
Refer to the table below for the minimum re-
quired nominal size of the connecting line at
the port
1
of the enclosure.
The specifications apply to a connecting line
shorter than 2 m. Use a larger nominal size
for lines longer than 2 m.
Connection
1
Pipe
1)
12×1 mm
Hose
2)
9×3 mm
1)
Outside diameter x Wall thickness
2)
Inside diameter x Wall thickness
5.2 Compressed air quality
The operating medium for the device is in-
strument air (free from corrosive substances),
2.5 to 10 bar.
Compressed air quality according to
ISO 8573-1
Particle size
and quantity
Oil content Pressure dew point
Class 4
Class 3
Class 3
≤5 µm and
1000/m³
≤1 mg/m³
–20 °C/10 K
below the lowest
ambient
temperature to be
expected
