15
4 Mounting
VEGAPULS SR 68 • 4 … 20 mA/HART - two-wire
38294-EN-160707
4.3 Mounting instructions
The emitted radar impulses of the radar sensor are electromagnetic
waves. The polarisation is the direction of the electrical wave compo-
nent. By turning the instrument in the connection flange or mounting
boss, the polarisation can be used to reduce the effects of false
echoes.
The position of the polarisation is marked on the process fitting of the
instrument.
1
2
Fig. 4: Position of the polarisation
1 Marking with screwed version
2 Marking with flange version
Mount the sensor at least 200 mm (7.874 in) away from the vessel
wall.
200 mm
(7.87")
Fig. 5: Mounting the radar sensor on the vessel top
If you cannot maintain this distance, you should carry out a false
signal suppression during setup. This applies particularly if buildup on
the vessel wall is expected. In such cases, we recommend repeating
the false signal suppression at a later date with existing buildup.
Mounting should not be too close to the inflowing material as the
microwave signal will be interferred. The optimum mounting position is
on the opposite of the filling. To avoid strong pollution, the distance to
the filter or dust extraction must be as big as possible.
Polarisation
Installation position
Inflowing medium
