Pepperl+Fuchs KFD2-HLC-Ex1.D Series Manual page 14

HART Loop Converter KFD2-HLC-Ex1.D(.**)
Mounting and Installation
Danger!
EN Explosion hazard from wrong mounting
The device safety can be impaired by external environmental influences and by
mechanical stress. This can lead to sparking that can ignite a surrounding potentially
explosive atmosphere.
Mount the device in a surrounding enclosure that complies with IEC/EN 60079–0and that 
is rated with the degree of protection IP54 according to IEC/EN 60529.
Mounting the Device
Snap the device onto the DIN mounting rail in a vertical downward movement. See figure
below.
CORRECT: Device snapped on vertically.
Figure 3.3
12 - EN
INCORRECT: Device snapped on from the side.
Can damage the contacts and cause the device to fail.